INTRODUCTION
Monoclonal antibodies are laboratory manufactured clones of antibody proteins with high specificity for a specific antigen. While initially utilized predominantly in organ transplantation, rheumatoid arthritis, and hematologic cancers, recent years have seen expansion to new fields, including thyroid eye disease, Alzheimer's disease, and chronic migraine. 1 Technological advancements and the expansion of antibody targets to treat a vast breadth of disease underlies the rise of these agents' more widespread use. 2 Conditions targeted by monoclonal antibodies have grown to encompass oncologic and inflammatory‐based diseases, neurologic pathologies, and transplantation. As these agents gain more popularity, it is critical to understand both short‐ and long‐term implications associated with their adverse effects, which can have substantial effects on patients' quality of life.
Unforeseen reactions from monoclonal antibodies can range from transfusion reactions to hypersensitivity reactions, as well as organ‐specific adverse effects. 3 Monoclonal antibodies have been reported to have impact on hearing function, which are postulated to be a result of intracochlear mechanisms such as drug‐induced vasculitis of the inner ear arteries or cross‐reactivity resulting in impaired hair cell function. 4 , 5 Symptoms of toxicity to the auditory and vestibular organs include hearing loss, tinnitus, aural fullness, vertigo, and dizziness, which have been commonly reported with a variety of drug classes including, but not limited to, platinum‐based chemotherapeutic agents, aminoglycoside antibiotics, and loop diuretics. 6
As this rapidly expanding class of agents continues to grow, otolaryngologists may increasingly be called upon to evaluate patients with otologic symptoms in the setting of therapy with monoclonal antibodies. In this systematic review, we synthesize reports of monoclonal antibody usage resulting in reported effects on hearing function. Where available, audiometric data from studies are presented to further characterize these effects, as well as proposed mechanisms of ototoxicity.
METHODS
This study was exempt from approval by the University of Pennsylvania Institutional Review Board. A systematic review was performed in accordance with standardized PRISMA guidelines. 7
Search Strategy and Study Selection
The authors sought to assess the ways in which patients treated with monoclonal antibodies experienced otologic effects through the following PEO question: In adult patients undergoing treatment with immunomodulatory monoclonal antibodies, what agents are implicated in ototoxic adverse effects and what proportion of patients experience these effects? It was hypothesized that effects toxic in nature to hearing outcomes following the usage of monoclonal antibodies would be identified. A systematic literature search was performed in PubMed, Embase, and Scopus on June 22, 2024. Search strings were formatted to identify publications reporting a relationship between the usage of a monoclonal antibody and hearing loss. The search string was formatted as follows: (“monoclonal antibody”:ab,ti OR “monoclonal antibodies”:ab,ti OR “immune checkpoint inhibitors”:ab,ti OR “checkpoint”:ab,ti OR “nivolumab”:ab,ti OR “ipilimumab”:ab,ti OR “pembrolizumab”:ab,ti OR “teprotumumab”:ab,ti OR “muronomab”:ab,ti OR “rituximab”:ab,ti OR “infliximab”:ab,ti OR “dupilumab”:ab,ti) AND (“hearing loss”:ab,ti OR “sudden hearing loss”:ab,ti OR “sensorineural hearing loss”:ab,ti). There were no temporal limits applied to the search. Articles were managed using Covidence systematic review software (Veritas Health Innovation, Australia, 2020).
A total of 1084 studies were retrieved from database search. Following removal of duplicates, 757 article were imported for screening. Study types included clinical case reports and series, prospective studies, and retrospective studies. Articles were eligible for inclusion if they reported upon hearing loss occurring with monoclonal antibody use in adult patients. Reporting of audiometric data was not required to be included for review. Pediatric patients were excluded given different age‐based audiometric criteria and techniques for hearing assessment in this population. Exclusion criteria encompassed articles where an immunomodulatory agent or antibody was not mentioned, hearing loss was not mentioned, conference abstracts, non‐English articles, review articles, animal models, and articles reporting only pediatric data or where adult and pediatric data could not be isolated. Two authors (P.A. and Y.S.) performed the initial review of the literature and a third (A.E.Q.) served as an adjudicator. Full‐text articles were reviewed by the same two authors (P.A. and Y.S.) and adjudicated by a third (A.E.Q). Reference lists of included full‐text articles were additionally reviewed to identify articles for inclusion. A PRISMA flow diagram is indicated in Figure 1 . 8
![Fig. 1 PRISMA diagram of included studies. [Color figure can be viewed in the online issue, which is available at www.laryngoscope.com .]](/library/4497379/assets/b89dcbc303c3a285e4e8d605eabed6126929feb6e5518e0a0720e8cc0e39c23c.jpg/)
Data Collection
Data recorded from each article included baseline study characteristics, including title, authorship, country of origin, publication year, publication journal, study design, and sample size. In subjects with ototoxicity attributed to monoclonal antibody usage, information recorded included age, gender, monoclonal antibody studied, indication(s) for monoclonal agent use, length of treatment, follow‐up timeline, concurrent medications, comorbidities, pre‐ and posttreatment audiometric data at low, middle, high, and ultrahigh frequencies when available, pattern of audiometric data (SNHL vs. CHL, laterality, severity), tympanometry, word recognition score (WRS), speech recognition threshold (SRT), treatment for ototoxicity (if observed), and reversal (if observed) with audiometric data (if provided). Frequency ranges were defined as follows: low (250–500 kHz), middle (1–3 kHz), high (4–8 kHz), ultrahigh (>8 kHz). Medication‐induced ototoxicity was determined usually by established guidelines from the American Speech‐Language‐Hearing Association (ASHA): 20 dB threshold decrease at any frequency, 10 dB decrease at any two consecutive frequencies, or no response at three consecutive frequencies when responses were previously present. 9
Data Analysis
A quantitative synthesis was performed using pooled samples. Given the heterogeneity of studies and results reporting, a standard meta‐analysis for comparing studies with paired samples and a weighted average was not feasible.
Risk of Bias Assessment
Bias of publication was assessed for each included article with the Mixed Methods Appraisal Tool (MMAT). 10 Evaluated domains included: participant selection, randomization, assessor blinding, adherence to intended intervention, completeness of data, and outcome measurement. The series of questions to assess bias within the tool were answered based on article type for each included study.
RESULTS
Search Results
A total of 44 studies met criteria for inclusion. A description of the participants, interventions, comparisons, outcomes, timing, and study design (PICOTS) of included ototoxic publications is shown in Table I . 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 Table S1 summarizes reasons for exclusion during literature search and review.
TABLE I
Population, Intervention, Comparators, Outcomes, Timing, and Study Design of Ototoxic Studies.
DPOAE = distortion product otoacoustic emission; PET = patulous eustachian tube; TED = Thyroid Eye Disease.
| Study | Year | Journal | Sample Size | Population | Intervention | Comparator | Outcome | Timing | Study Design |
| Barbieri 11 | 2019 | Front Pharmacol | 6784 | Patients who experienced ototoxic drug‐induced adverse reactions | Rituximab, Infliximab, Adalimumab, Abatacept | Adults who experienced non‐ototoxic adverse drug reactions | Hearing loss, tinnitus | 16‐year period | Database case/non‐case |
| Belinsky 4 | 2022 | Ophthalmic Plast Reconstr Surg | 4 | Patients who experienced hearing loss after treatment with teprotumumab | Teprotumumab | Pure‐tone audiometry | Hearing loss | 7‐mo follow‐up | Case series |
| Choi 12 | 2020 | Head & Neck | 1 | Patient who experienced hearing loss and tinnitus after treatment with ipilimumab and nivolumab | Ipilimumab, Nivolumab | Pure‐tone audiometry | Hearing loss, tinnitus | 8‐mo follow‐up | Case report |
| Chow 13 | 2022 | BMJ | 1 | Patient who experienced hearing loss after treatment with teprotumumab | Teprotumumab | Pure‐tone audiometry | Hearing loss | 6 weeks | Case report |
| Conway 14 | 2011 | J Rheumatology | 2 | Patients who experienced hearing loss after treatment with adalimumab | Adalimumab | n/a | Hearing loss | 4‐mo follow‐up | Case report |
| Douglas 15 | 2023 | J Clinical Endocrinology & Metabolism | 42 | Patients with TED treated with Teprotumumab | Teprotumumab | Adults who experienced non‐adverse drug reactions | Hearing loss | 6 mo | Randomized controlled trial |
| De Groot 16 | 2019 | J Neurology | 1 | Patient who experienced hearing loss after treatment with Pembrolizumab | Pembrolizumab | Pure‐tone audiometry | Hearing loss, tinnitus | 6‐mo follow‐up | Case report |
| Ding 17 | 2022 | Otology & Neurotology | 1 | Patient who experienced hearing loss after treatment with teprotumumab | Teprotumumab | Pure‐tone audiometry | Hearing loss | 8‐mo follow‐up | Case study |
| Favreliere 18 | 2020 | Fundam Clin Pharmacol | 26 | Patients who experienced hearing loss after treatment with monoclonal antibodies | Panitumumab, Trastuzumab, Rituximab, Adalimumab | Adults who experienced non‐ototoxic adverse drug reactions | Hearing loss | 10‐year period | Database case/non‐case |
| Gambichler 19 | 2020 | Immunotherapy | 1 | Patient who experienced hearing loss after treatment with nivolumab | Nivolumab | Pure‐tone audiometry | Hearing loss | 10‐mo follow‐up | Case report |
| Grisariu 20 | 2016 | Hematological Oncology | 3 | Patients who experienced hearing loss after treatment with Rituximab | Rituximab | Pre‐treatment subjective hearing ability | Hearing loss | Variable follow‐up: 2 mo to 1 year | Case series |
| Hartnick 21 | 1997 | Ann Otol Rhinol Laryngol | 1 | Patient who experienced hearing loss after treatment with muronomab | Muronomab | Pure‐tone audiometry | Hearing loss | 10‐day follow‐up | Case report |
| Healy 22 | 2015 | Neuromuscular Disorders | 1 | Patient who experienced hearing loss after treatment with rituximab | Rituximab | Pure‐tone audiometry | Hearing loss | 40‐mo follow‐up | Case report |
| Highland 23 | 2022 | Annals of Otology, Rhinology & Laryngology | 1 | Patient who experienced hearing loss after treatment with teprotumumab | Teprotumumab | Pure‐tone audiometry | Hearing loss | 4‐mo follow‐up | Case study |
| Hobelmann 24 | 2019 | J Otol Rhinol | 1 | Patient who experienced hearing loss after treatment with Pembrolizumab | Pembrolizumab | Pure‐tone audiometry, tympanometry, DPOAE | Hearing loss | 12‐week follow‐up | Case report |
| Kahaly 25 | 2021 | Lancet Diabetes Endocrinol | 84 | Patients who experienced hearing loss after treatment with Teprotumumab | Teprotumumab | Pre‐treatment subjective hearing ability | Hearing loss | 72‐week follow‐up | Pooled data analysis |
| Kay‐Rivest 26 | 2022 | Otolaryngol Head Neck Surg | 35 | Adults treated with teprotumumab between May 2020 and January 2022 | Teprotumumab | Pure‐tone audiometry, tympanometry, DPOAE | Hearing loss | 6‐mo follow‐up | Prospective cohort |
| Keen 27 | 2023 | Ophthalmology | 22 | Patients who experienced hearing loss after treatment with Teprotumumab | Teprotumumab | Pure‐tone audiometry | Hearing loss | Variable follow‐up: 2–17 mo | Case series |
| Lemasson 28 | 2019 | European Journal of Cancer | 4 | Adults who experienced hearing loss after treatment with Nivolumab | Nivolumab | Pure‐tone audiometry | Hearing loss | Variable follow‐up: 1–14 mo | Case series |
| Lu 29 | 2023 | Case Reports in Ophthalmology | 1 | Patient who experienced hearing loss after treatment with Teprotumumab | Teprotumumab | Pure‐tone audiometry | Hearing loss | 90 weeks | Case study |
| Men 30 | 2024 | Ophthalmic Plast Reconstr Surg | 66 | Patients with TED treated with Teprotumumab | Teprotumumab | Adults who experienced non‐adverse drug reactions | Hearing loss | Mean 37‐week follow‐up | Retrospective study |
| Monferrer‐Adsuara 31 | 2021 | Optom Vis Sci | 1 | Patient who experienced hearing loss after being treated with ipilimumab | Ipilimumab | Pure‐tone audiometry | Hearing loss | 3 years | Case report |
| Nagai 32 | 2023 | Case Reports in Ophthalmological Medicine | 1 | Patient who experienced hearing loss after treatment with nivolumab | Nivolumab | Pure‐tone audiometry | Hearing loss | 1‐year follow‐up | Case report |
| Najjar 33 | 2022 | OTO Open | 1 | Patient who experienced hearing loss after treatment with teprotumumab | Teprotumumab | Pure‐tone audiometry | Hearing loss, tinnitus | 1‐mo follow‐up | Case study |
| Page 34 | 2022 | Diagnostics | 4 | Patients who experienced hearing loss after treatment with immunotherapy | Ipilimumab, Nivolumab, Pembrolizumab | Pure‐tone audiometry | Hearing loss, tinnitus, aural fullness | Variable follow‐up to 8 mo | Case series |
| Park 35 | 2022 | Diagnostics | 429 | Patients who experienced hearing loss after treatment with omalizumab or mepolizumab | Omalizumab, Mepolizumab | Pre‐treatment subjective hearing ability | Various presentations of ear and labyrinth disorders | Cases between 1968 and 2019 | Database case/non‐case |
| Phansalkar 36 | 2023 | The American Society of Ophthalmic Plastic and Reconstructive Surgery | 1 | Patient who experienced hearing loss after treatment with teprotumumab | Teprotumumab | Pure‐tone audiometry | Hearing loss, tinnitus, popping, autophony | 5‐mo follow‐up | Case study |
| Rajapakse 37 | 2020 | Oxford Medical Case Reports | 1 | Patient who experienced hearing loss after treatment with nivolumab | Nivolumab | Pure‐tone audiometry | Hearing loss | 3‐mo follow‐up | Case report |
| Ray 38 | 2021 | The Journal of Headache and Pain | 8 | Patient who experienced hearing loss after treatment with CGRP mAb | Erenumab, Fremanezumab | Pre‐treatment subjective hearing ability | Hearing loss | 6‐mo treatment | Case series |
| Reed 39 | 2021 | The American Society of Ophthalmic Plastic and Reconstructive Surgery | 1 | Patient who experienced hearing loss after treatment with teprotumumab | Teprotumumab | Pure‐tone audiometry | Hearing loss | 1‐year follow‐up | Case study |
| Rosner 40 | 2020 | Journal for Immunotherapy of Cancer | 6 | Patients who experienced hearing loss after treatment with immune checkpoint inhibitors | Nivolumab, Ipilimumab, Pembrolizumab | Pure‐tone audiogram | Hearing loss, tinnitus | Variable follow‐up to 10 years | Case series |
| Savastano 41 | 2010 | B‐ENT | 28 | Patients who experienced hearing loss after treatment with TNF blocker | Etanercept, Infliximab | Pure‐tone audiogram | Hearing loss, tinnitus | Variable treatment time: 4–34 mo | Retrospective study |
| Schlacter 42 | 2023 | Cochlear Implants International | 1 | Patient who experienced hearing loss after treatment with ipilimumab and nivolumab | Nivolumab, Ipilimumab, Pembrolizumab | Pure‐tone audiogram | Hearing loss, vertigo | 1‐year follow‐up | Case report |
| Sears 43 | 2022 | Am J Ophthalmol | 27 | Patients with TED treated with teprotumumab between February 2020 and May 2021 | Teprotumumab | Pure‐tone audiometry, PET tympanometry | Hearing loss | 14‐mo follow‐up | Prospective cohort |
| Shah 44 | 2023 | Ophthalmology | 131 | Patients with TED treated with Teprotumumab between February 2020 and October 2022 | Teprotumumab | Adults who experienced non‐adverse drug reactions | Hearing loss | Mean 70‐week follow‐up | Retrospective study |
| Stürmer 45 | 2021 | J Immunotherapy | 3 | Patients who experienced hearing loss after treatment with immune checkpoint inhibitors | Nivolumab, ipilimumab, pembrolizumab | Pure‐tone audiometry | Hearing loss, vertigo, aural fullness, tinnitus | Variable follow‐up to 7 mo | Case series |
| Tampio 46 | 2021 | Ear, Nose & Throat Journal | 1 | Patient who experienced hearing loss after treatment with nivolumab | Nivolumab | Pure‐tone audiometry | Hearing loss, vertigo | 4‐mo follow‐up | Case report |
| Touma 47 | 2007 | Rheumatol Int | 2 | Patients who experienced hearing changes after treatment with Infliximab | Infliximab | Pure‐tone audiometry | Hearing loss, vertigo | 4‐m and 2‐year follow‐up | Case report |
| Voskens 48 | 2012 | Journal of Clinical Oncology | 1 | Patient who experienced hearing loss after treatment with ipilimumab | Ipilimumab | Pure‐tone audiometry | Hearing loss, dizziness | 6‐day follow‐up | Case report |
| Yu 49 | 2021 | Am J Ophthalmol Case Rep | 2 | Patients who experienced hearing changes after treatment with teprotumumab | Teprotumumab | Pure‐tone audiometry | Hearing loss | 6‐mo follow‐up | Case series |
| Yun 50 | 2024 | Expert Opinion on Drug Safety | 8727 | Patients who experienced hearing changes after treatment with daratumumab | Daratumumab | Adults who experienced non‐ototoxic adverse drug reactions | Hearing loss | 7‐year period | Database case/non‐case |
| Zhang, Huang 51 | 2018 | J BUON | 45 | Patients treated with Nimotuzumab | Nimotuzumab | Adults who experienced non‐ototoxic adverse drug reactions | Hearing loss | Median 38‐mo follow‐up | Open‐label clinical trial |
| Zhang, Wang 52 | 2024 | International Journal of Clinical Pharmacy | 1542 | Patients who experienced hearing changes after treatment with teprotumumab | Teprotumumab | Adults who experienced non‐ototoxic adverse drug reactions | Various presentations of ear and labyrinth disorders | 3‐year period | Database case/non‐case |
| Zibelman 53 | 2016 | Journal for Immunotherapy of Cancer | 1 | Patient who experienced hearing loss after treatment with pembrolizumab | Pembrolizumab, Ipilimumab | Pure‐tone audiometry | Hearing loss | 12‐week treatment period | Case report |
Assessment of Bias
Bias was assessed using the MMAT. The studies included in this review were considered to have a relevant sampling strategy and be representative of the target population. The largest proportion of included articles (79.5%) reported on quantitative descriptive studies (Table II ). The distribution of affirmative responses to the MMAT categories indicate a generally high quality within the framework of their respective designs. The assessment results are detailed in Table II .
TABLE II
Mixed Methods Appraisal Tool.
MMAT = Mixed Methods Appraisal Tool.
| Ototoxic | ||||||
| Study Type | Yes on 5 MMAT Criteria | Yes on 4 MMAT Criteria | Yes on 3 MMAT Criteria | Yes on 2 MMAT Criteria | Yes on 1 MMAT Criteria | Yes on 0 MMAT Criteria |
| Quantitative randomized studies ( n = 1, 2.2%) | 1 | 0 | 0 | 0 | 0 | 0 |
| Quantitative non‐randomized studies ( n = 8, 18.2%) | 3 | 1 | 1 | 3 | 0 | 0 |
| Quantitative descriptive studies ( n = 35, 79.5%) | 7 | 17 | 10 | 1 | 0 | 0 |
Patient and Study Characteristics
The 44 included studies consisted of 31 case reports or series, two prospective cohort studies, three retrospective cohort studies, one open‐label trial, one randomized controlled trial, one pooled analysis and five database analyses. Twenty‐nine of the 44 studies only included patients who reported adverse otologic symptoms and 15 reported all patients who took the monoclonal antibody, regardless of ototoxic symptoms. Across the 44 included studies, a total of 18,046 patients were treated with mABs and noted to have hearing‐related symptoms and audiometric findings while taking the medication. Thirty‐one of the 44 studies reported obtaining audiometric data, with 23 of those providing either the results of WRS/SRT testing or the audiograms directly, and only seven studies including baseline audiometric evaluations. Where demographic information was provided by included studies, the mean age of patients assessed across studies was 57.8 years old and comprised of 3335 females. Characteristics of included patients, where reported, are summarized in Table III . Table IV reports the quantitative data available across the included studies.
TABLE III
Clinical Characteristics.
| Characteristic | Overall |
| Studies | 44 |
| Mean age (years) | 57.8 |
| Female | 3335 |
| Clinical Symptoms | |
| Hearing loss or deafness | 506 |
| Otalgia | 297 |
| Tinnitus | 127 |
| Vertigo/dizziness | 53 |
| Fullness | 38 |
| Autophony | 30 |
| Popping | 12 |
| Other unspecified ototoxic symptoms | 215 |
TABLE IV
Types of Data Reported Across Included Studies.
SRT = speech recognition threshold; WRS = word recognition score.
| Effect | Patient Report Only | Description of Audiograms Only | Audiograms or WRS/SRT |
| Ototoxic ( n = 44) | 13 (30%) | 8 (18%) | 23 (52%) |
Outcomes of Ototoxicity
The search yielded 18 agents across 44 studies reported to have ototoxic symptoms, inclusive of a total sample size of 18,046 patients. Symptoms of ototoxicity occurred in 1079 patients. Of these patients, 524 were identified from studies that only reported patients who experienced ototoxicity after treatment with a monoclonal antibody (i.e., case reports of hearing loss after treatment). Conversely, 555 of the patients who experienced ototoxicity came from studies that included all patients treated by a monoclonal antibody, regardless of ototoxic side effect. Agents causing ototoxicity included teprotumumab ( n = 17/44 studies), nivolumab ( n = 10/44), ipilimumab ( n = 9/44), pembrolizumab ( n = 5/44), and rituximab ( n = 4/44), adalimumab ( n = 3/44), and infliximab ( n = 2/44). Additional reported agents included abatacept, daratumumab, erenumab, etanercept, fremanezumab, mepolizumab, muronumab, nimotuzumab, omalizumab, panitumumab, and trastuzumab ( n = 1/44 each).
Thirty‐one of 44 studies encompassing eight agents (infliximab, teprotumumab, ipilimumab, nivolumab, pembrolizumab, muronumab, rituximab, etanercept) reported audiometric data for ototoxic agents, showing sensorineural hearing loss (SNHL) primarily in the high‐frequency range. Seven of the 31 studies, evaluating etanercept, infliximab, and teprotumumab, reported performing an audiogram prior to the start of treatment as well as after the onset of monoclonal antibody‐related ototoxic symptoms. Twenty‐four studies performed audiometric testing only at the onset of symptomatology, assessing infliximab, ipilimumab, muronumab, nivolumab, rituximab, pembrolizumab, and teprotumumab. Only two of 31 articles performed ultrahigh‐frequency audiograms, both of which were reported with teprotumumab. None of the studies scheduled regular audiometric testing during treatment with the monoclonal antibody, regardless of symptomatology. Studies involving abatacept, adalimumab, daratumumab, erenumab, fremanezumab, nimotuzumab, mepolizumab, omalizumab, panitumumab, and trastuzumab did not perform audiometric data collection, with only subjective reporting of symptoms. Systemic and/or intratympanic steroids were used for treatment of hearing loss in 23 studies, with partial or complete recovery reported in 17 studies, though only 15 of which reported audiometric data. Notably, Touma et al. denoted in their case series of two patients that one patient experienced audiogram improvement with infliximab, whereas another experienced audiogram deterioration with infliximab. 47
Ototoxic agent quantitative data represented across included studies are detailed in Table V . ASHA guidelines for medication‐induced ototoxicity are denoted as a 20 dB threshold decrease at any frequency, 10‐dB decrease at any two consecutive frequencies, or no response at three consecutive frequencies where responses were previously present. The following ototoxic agents met one of these criteria: pembrolizumab, nivolumab, rituximab, ipilimumab, teprotumumab, and muronumab. 9 Ototoxic agents represented across included studies, their indications, mechanism of action, mechanism of ototoxicity, and methods of administration are detailed in Table VI . 54 , 55 , 56 , 57
TABLE V
Summary of Data Across Included Studies.
ASHA = American Speech‐Language‐Hearing Association; DPOAE = distortion product otoacoustic emisison; HL = hearing loss; PET = patulous eustachian tube; PTA = pure tone average; SD = standard deviation; SNHL = sensorineural hearing loss; SRT = speech recognition threshold; VOR = vestibulo‐ocular reflex; WNL = within normal limits; WRS = word recognition score.
| Study | Agent | Evidence Provided | Data |
| Barbieri | Rituximab, Infliximab, Adalimumab, Abatacept | Patient report only | Hypoacusis (rituximab—4/5 ototoxic ADRs), tinnitus (adalimumab—3/4 ototoxic ADRs), unspecified ototoxic ADRs (infliximab— n = 4) Rituximab (5/2041), Infliximab (4/2243), Adalimumab (4/1673), Abatacept (4/827) |
| Conway | Adalimumab | Patient report only | Unilateral SNHL |
| Douglas | Teprotumumab | Patient report only | Hearing impairment reported in nine patients treated with teprotumumab with other reports of autophony (1), eustachian tube dysfunction (1), tympanic membrane disorder (1), tinnitus (2), hypoacusis (4), conductive deafness (1), and deafness unilateral (2) |
| Favreliere | Panitumumab, Trastuzumab, Rituximab, Adalimumab | Patient report only | Hearing loss (more specific information not provided) |
| Grisariu | Rituximab | Patient report only | Three patients had hearing disturbances, including two with a permanent impairment |
| Kahaly | Teprotumumab | Patient report only | 10% of pts taking teprotumumab (8/84) experienced hearing impairment events; reported as deafness, eustachian tube dysfunction, hyperacusis, hypoacusis, or autophony and were all classified as nonserious. All patients continued in the study without event worsening. No patients discontinued treatment because of these events. No similar events were reported in the placebo group. |
| Men | Teprotumumab | Patient report only | Of the 43% of patients that reported hearing impairment, 8 described ear plugging, 13 hearing loss, 8 tinnitus, and 6 autophony |
| Nagai | Nivolumab | Patient report only | Hearing loss (more specific information not provided) |
| Park | Omalizumab, Mepolizumab | Patient report only | Asthma‐related ear and labyrinth disorders caused by Omalizumab ( n = 394) and Mepolizumab ( n = 35) (i.e., deafness unilateral, eustachian tube disorder, ear disorder) |
| Ray | Erenumab, Fremanezumab | Patient report only | 1 of 8 patients took erenumab for 6 mo, followed by fremanezumab experienced unilateral hearing loss. No auditory AEs in other patients. |
| Yun | Daratumumab | Patient report only | 40 patients reported ear and labyrinth disorders with 5 patients reporting sudden hearing loss |
| Zhang, Huang | Nimotuzumab | Patient report only | 11 cases of “hearing loss,” no other information provided |
| Zhang, Wang | Teprotumumab | Patient report only | 273 patients reported hearing impairment with other reports of autophony (6), deafness permanent (13), deafness neurosensory (17), ear discomfort (36), deafness bilateral (5), deafness unilateral (11), tinnitus (80), deafness (69), hypoacusis (117), and ear swelling (3) |
| De Groot | Pembrolizumab | Description of audiometric test results only | Bilateral hearing loss of 80 dB + tinnitus |
| Gambichler | Nivolumab | Description of audiometric test results only | Audiometry revealed severe bilateral SNHL with normal tympanometry. This hearing loss was objectively proven by missing otoacoustic emissions on both sides. |
| Healy | Rituximab | Description of audiometric test result s only | Audiometry confirmed sensorineural deafness with vestibular and cochlear failure |
| Keen | Teprotumumab | Description of audiometric test results only | Eight patients reported new hearing symptoms and five showed hearing loss; other symptoms included tinnitus, ear fullness, ear popping, hearing loss, autophony, ear pain, and vertigo. 11 of the 22 patients (50.0%) met ototoxicity criteria in at least 1 ear. PTA decibel hearing levels across all patients showed hearing loss after treatment at high and middle, but not low frequencies. |
| Lemasson | Nivolumab | Description of audiometric test results only | Bilateral asymmetric hearing loss on cochleovestibular tests ( n = 1); bilateral perceptive hearing loss slightly predominant right in tonal and symmetrical in speech recognition tests ( n = 1); asymmetrical bilateral perceived hearing loss ( n = 1) |
| Shah | Teprotumumab | Description of audiometric test results only | 31% of patients experienced at least one otologic adverse event with reports of hearing impairment (18), tinnitus (16), autophony (9), ear fullness (17). During treatment, 13.7% of patients reported new or worsening hearing impairment (8 confirmed by audiogram). |
| Touma | Infliximab | Description of audiometric test results only | Case 1 (3 weeks post Cogan's diagnosis): Post infliximab, decrease in the sensation of aural fullness and vertigo and subjective improvement in hearing, associated with improvement on the audiogram in the left ear. Case 2 (2.5 years post Cogan's diagnosis): Post infliximab, deterioration in hearing and worsening in vertigo and audiogram. |
| Voskens | Ipilimumab | Description of audiometric test results only | No audiogram provided. Bilateral internal ear hearing impairment of greater than 45 dB. |
| Belinsky | Teprotumumab | Audiogram or WRS/SRT provided | Audiograms provided Case 1 : Pure‐tone audiometry shows moderate to severe down‐sloping SNHL bilaterally. WRS were 64% in the right ear and 68% in the left ear. Case 2 : Audiogram after fourth teprotumumab infusion showed mild to moderately severe SNHL bilaterally, with a conductive component of 20 dB in the left ear, with 96% WRS on the right and 84% on the left. Repeat audiogram 1 month after fifth teprotumumab infusion: SNHL continued to be mild to moderately severe bilaterally, with worsening WRS of 92% on the right and 80% on the left. 3 mo after the eighth infusion, repeat audiogram: sustained SNHL bilaterally with slight decrease in low‐frequency hearing on the right, and decreasing WRS of 88% on the right and 72% on the left. Case 3 : Baseline auditory testing and follow‐up auditory testing showing normal hearing sensitivity on standard audiometry (250 Hz–8 KHz), but worsening sensitivity on the follow‐up high‐frequency audiogram (8–20 KHz). WRS remained excellent bilaterally. Case 4 : Audiogram revealed mild SNHL bilaterally in the standard and high frequency ranges. |
| Choi | Ipilimumab, Nivolumab | Audiogram or WRS/SRT provided | Audiograms provided. Bilateral moderate to severe sloping low‐ to high‐frequency SNHL. Speech recognition scores of 68% in the left ear and 60% in the right ear. |
| Chow | Teprotumumab | Audiogram or WRS/SRT provided | Audiograms provided: Bilateral mild to moderate–severe down‐sloping SNHL with 15–30 dB decline at 500–8000 Hz compared with baseline |
| Ding | Teprotumumab | Audiogram or WRS/SRT provided | Audiograms provided: moderate to severe down‐sloping SNHL bilaterally. SRT was 55 dB hearing level bilaterally. WRS was 64% for the right ear and 68% for the left ear. |
| Hartnick | Muronumab | Audiogram or WRS/SRT provided | Audiograms provided: bilateral, mildly down‐sloping, SNHL reversible with discontinuation. Speech thresholds 30 dB and 35 dB for R and L ear, with discriminations of 92% and 88%, respectively. |
| Highland | Teprotumumab | Audiogram or WRS/SRT provided | Audiogram provided: symmetric bilateral mild sloping to moderately severe SNHL. Word recognition on the right 84%, and 92% word recognition on left. |
| Hobelmann | Pembrolizumab | Audiogram or WRS/SRT provided | Audiograms provided: symmetric, moderate (low frequencies) to severe (high frequencies) SNHL. Tympanogram: type A (normal) bilaterally. DPOAE: absent otoacoustic emissions at all frequencies. WRS was 72% in the left ear and 68% in the right ear. |
| Kay‐Rivest | Teprotumumab | Audiogram or WRS/SRT provided | Audiograms not provided. dB changes in standard and high frequencies: 11 patients had threshold shifts that are considered significant as per ototoxicity management guidelines. Three patients (21.4%) were found to have changes in standard frequency audiometry, and 10 (71.4%) were noted to have changes in high frequency audiometry, with two patients having changes in both. All changes were considered mild. Less than half ( n = 5) of the 11 patients with changes in standard or high‐frequency pure‐tone hearing noted subjective hearing changes. Six patients with confirmed ( n = 3) or suspected ( n = 3) PET ( n = 15 with signs of hearing dysfunction [4/35 with subjective loss only, 11 with objective loss]) among the 14 patients with both pre and posttreatment testing, only mild (between 10 and 15 dB) declines were noted in the standard frequencies ( n = 3) and in the ultrahigh frequencies ( n = 11). In 60% of the cases, the hearing loss was symmetric. DPOAE changes in 4/13 patients. |
| Lu | Teprotumumab | Audiogram or WRS/SRT provided | Pure‐tone audiometry: average of 33 dB HL (the conductive component was minimal and ranged from 10 to 15 dB). Audiogram provided: mild down‐sloping to moderately severe mixed conductive and SNHL |
| Monferrer‐Adsuara | Ipilimumab | Audiogram or WRS/SRT provided | Audiogram provided: right‐sided low‐frequency SNHL |
| Najjar | Teprotumumab | Audiogram or WRS/SRT provided | Audiograms provided: Right ear results revealed normal hearing in the low frequencies, sloping to mild SNHL at 2000 to 8000 Hz. Left ear results revealed normal hearing in the low frequencies, sloping to mild SNHL from 1000 to 8000 Hz. Speech and word recognition were not affected bilaterally. |
| Page | Ipilimumab, Nivolumab, Pembrolizumab | Audiogram or WRS/SRT provided | Audiograms not provided, but noted to show: Case 1 : bilateral moderate to severe sloping low‐ to high frequency SNHL with speech recognition scores of 68% in the left ear and 60% in the right ear. Case 2 : bilateral moderate sloping to severe SNHL and WRSs were 60% and 75% on the right and left, respectively. Case 3 : mild–moderate SNHL; WRS unaffected. Case 4 : severe to profound bilaterally, and WRSs were 20% and 4% on the right and left, respectively. |
| Phansalkar | Teprotumumab | Audiogram or WRS/SRT provided | Audiograms provided. 10 to 15 dB of hearing loss between 4000 and 8000 Hz in the right ear and 15 to 20 dB of hearing loss between 6000 and 8000 Hz in the left ear compared with baseline. Patient never fully recovered to initial baseline and experienced mild changes in hearing following half‐dose teprotumumab. |
| Rajapakse | Nivolumab | Audiogram or WRS/SRT provided | Audiograms provided. Unilateral sensorineural deafness was diagnosed on audiometry at both high‐ and low‐frequency levels. |
| Reed | Teprotumumab | Audiogram or WRS/SRT provided | Audiograms provided: moderate to severe SNHL in both ears at 500–1500 Hz and 6000–‐8000 Hz, worse in the left ear. Subjective decrease in hearing after initiating teprotumumab therapy, followed by an acute significant decrease in hearing after the rifle blast. |
| Rosner | Nivolumab, Ipilimumab, Pembrolizumab | Audiogram or WRS/SRT provided | Audiograms provided. WRS/SRT provided. Case 1 : mild sloping to moderately severe SNHL bilaterally Case 2 : moderate to moderately severe SNHL L > R Case 3 : mild to moderate SNHL through 4000 Hz R, mild to profound SNHL L Case 4 : sloping to mild SNHL R, moderate 6000 Hz sensorineural notch L Case 5 : tinnitus only, audiometry normal hearing bilaterally, WRS/SRT WNL Case 6 : mild L sensorineural notch at 4 kHz, 88% WRS R, 100% WRS L, normal tympanometry bilaterally |
| Savastano | Etanercept, Infliximab | Audiogram or WRS/SRT provided | Pure‐tone thresholds provided. SNHL diagnosed in 16/28 (57.1%) patients. The mean pure‐tone thresholds in the worse ears (left or right) of the patients with SNHL were 14.8 ± 6.9 dB at 500 Hz, 14.3 ± 5.4 dB at 1000 Hz, 14.8 ± 6.7 dB at 2000 Hz, 20.8 ± 10.4 dB at 3000 Hz, and 26.8 ± 15.9 dB at 4000 Hz. |
| Schlacter | Nivolumab, Ipilimumab, Pembrolizumab | Audiogram or WRS/SRT provided | Audiograms provided: moderately severe sloping to profound HL on R, moderately severe sloping to severe SNHL on L. Speech discrimination scores 40% on the left and 36% on the right. |
| Sears | Teprotumumab | Audiogram or WRS/SRT provided | Audiograms provided: SNHL meeting ASHA criteria for ototoxicity. Average threshold declines ranging from −1 to 8.5 dB, average WRS declined by 14%, 1 pt developed PET. Subjective: ear plugging, fullness, and pressure ( n = 13; 48.1%); muffled hearing, hearing loss, and diminished word recognition ( n = 11; 40.7%); tinnitus and ear popping ( n = 10; 37.0%); and autophony ( n = 7; 25.9%). Twenty‐two patients (81.5%) developed new subjective otologic symptoms, after a mean of 3.8 infusions (SD 1.8). Six patients underwent baseline and posttreatment audiometry, five of whom developed teprotumumab‐related SNHL and one patient also developed PET. Three of the five patients with teprotumumab‐related SNHL had persistent subjective hearing loss at last follow‐up. A prior history of hearing loss was discovered as a risk factor for teprotumumab‐related SNHL ( p = 0.008). |
| Stürmer | Nivolumab, ipilimumab, pembrolizumab | Audiogram or WRS/SRT provided | Pure‐tone audiometry (average) provided. WRS provided. Case 1 : pure‐tone audiometry revealed symmetric bilateral SNHL. Distortion product otoacoustic emissions were absent. Video head impulse test resulted in a horizontal angular VOR gain of <0.6 on both sides and caloric testing revealed reduced stimulation with cold/warm water. Case 2 : bilateral SNHL (pure‐tone average; right side: 42.0 dB; left side: 33.8 dB; absent distortion product otoacoustic emission). Case 3 : bilateral vestibular dysfunction, no changes in hearing. |
| Tampio | Nivolumab | Audiogram or WRS/SRT provided | Audiogram provided. SRT provided. Bilateral, moderate sloping to moderately severe SNHL. |
| Yu | Teprotumumab | Audiogram or WRS/SRT provided | Audiograms provided: symmetric SNHL; intermittent tinnitus, low‐pitched hearing difficulty (but no audiometric changes from baseline) |
| Zibelman | Pembrolizumab, Ipilimumab | Audiogram or WRS/SRT provided | Audiogram provided 2 w post 2nd pembrolizumab dose: mild to moderately severe symmetric SNHL. Word recognition scores of 48% in the right ear and 44% in the left ear. |
TABLE VI
Agents Represented Across Included Studies With Mechanisms of Action.
EOM = eosinophilic otitis media; EP = endocochlear potential; IMCVD = immune‐mediated cochleovestibular disorders; NR = Not recorded; SNHL = sensorineural hearing loss.
| Antibody | Indications | Mechanism of Action | Proposed Mechanism(s) of Ototoxicity | Methods/Dose of Administration |
| Abatacept | Rheumatoid arthritis 54 | CD80/CD86 inhibitor 54 | NR | NR |
| Adalimumab | Inflammatory spondyloarthritis, refractory seronegative arthritis | TNF‐alpha inhibitor | NR | NR |
| Daratumumab | Multiple myeloma | CD38 modulator | NR | NR |
| Erenumab | Chronic migraine | CGRP inhibitor | Increased leukocyte recruitment, contributing to hyperactivation. | Dose @ 0, 2, 6 weeks |
| Etanercept | Ankylosing spondylitis, bilateral IMCVD or Meniere's disease | TNF‐alpha inhibitor | Drug‐induced vasculitis of the inner ear arteries; type III hypersensitivity reaction forming immunocomplexes with TNFα or induced autoantibody production and subsequent blood vessel reaction 56 | 25 mg 2×/week, 25 mg subq 2×/week for 24 weeks |
| Fremanezumab | Chronic migraine | CGRP inhibitor | Increased leukocyte recruitment, contributing to hyperactivation | Dose @ 0, 2, 6 weeks |
| Infliximab | Meniere's disease, ankylosing spondylitis, Cogan's disease | TNF‐alpha inhibitor | Same as etanercept 56 | 3 mg/kg q6wks, 3 mg/kg for 4 mo, IV 100 mg q2wks for 10 mo, 5 mg/kg infusion monthly |
| Ipilimumab | Metastatic melanoma, non‐small cell lung cancer, Merkel cell carcinoma, metastatic renal cell carcinoma, mucosal melanoma | CTLA‐4 inhibitor | T‐cell autoimmune response to melanocyte‐related antigens; antitumor reactivity and adverse events mediated by same T‐cell clone targeted against shared antigen between the melanoma and nontumor organs | 3 mg/kg q3wks for 9 weeks, 3 mg/kg IV q3wks for 2 mo, four cycles over 10 weeks, four doses of 3 mg/kg over 12 weeks, q3wks, 3 mg/kg/3 weeks with nivolumab |
| Mepolizumab | Asthma | IL‐5 inhibitor | NR | NR |
| Muronumab | Renal transplantation | CD3 modulation | “First‐dose” reaction causing release of various cytokines and neurotrophins affecting the organ of Corti; increased vascular permeability altering the ear | 5 mg 4×/day |
| Nimotuzumab | Nasopharyngeal carcinoma | EGFR inhibitor | NR | 200 mg IV/week for seven courses |
| Nivolumab | Metastatic melanoma, non‐small cell lung cancer, Merkel cell carcinoma, metastatic renal cell carcinoma, non‐small cell lung cancer | PD‐1 inhibitor | T‐cell overactivation; autoimmunity via T‐cell cross‐reactivity, resulting in loss of the EP and subsequent impairment of hair cell function; inability to differentiate between T‐cells interacting with cancer cells and T‐cells interacting with host cells causing collateral damage to other melanocytes, such as in the stria vascularis of the inner ear maintaining the EP | Four cycles over 10 weeks, q3wks, 3 mg/kg/2 weeks, 1 mg/kg/3 weeks with Ipi, 240‐mg fixed 1×/2 weeks |
| Omalizumab | Asthma | IgE inhibitor | Asthma often comorbid with EOM, characterized by eosinophil accumulation in the middle ear, increasing eosinophil signal for omalizumab | NR |
| Panitumumab | Metastatic colorectal carcinoma 55 | EGFR inhibitor 55 | NR | NR |
| Pembrolizumab | Non‐small cell lung cancer, metastatic melanoma, mucosal melanoma | PD‐1 inhibitor | Inability to differentiate between T‐cells interacting with cancer cells and T‐cells interacting with host cells causing collateral damage to other melanocytes, such as in the stria vascularis of the inner ear maintaining the EP | IV 2 mg/kg q3wks |
| Rituximab | Non‐Hodgkin's lymphoma, follicular lymphoma | CD20 inhibitor | Rituximab‐combined chemotherapy may induce persistent differentiation arrest and apoptosis of B cell lineage with alteration of T lymphocyte homeostasis resulting in pan‐hypogammaglobulinaemia, rarely with neurological involvement as seen in this case of meningitis with deafness | NR |
| Teprotumumab | Thyroid eye disease, Graves' disease, Hashimoto's disease | IGF‐1R inhibitor | IGF‐1R pathway is involved in cochlear development and maintenance. IGR‐1R deficiency has been shown to cause hearing loss in mice and humans—alterations in this pathway likely underlie the SNHL seen. For patients with a transient conductive component to hearing loss, clinical trials have identified some patients who developed Eustachian tube dysfunction and autophony. Another mechanism of ototoxicity resulting from IGF‐1 blockade may be atrophy of the nasopharyngeal fat pad, resulting in dysregulation of the Eustachian tube. | 10 mg/kg over 90 mo, four infusions—1st 10 mg/kg, subsequent 3 20 mg/kg (six more had same ×8 inf. q3wks), 1 year later ½ dose of 10 mg/kg per infusion ×9 |
| Trastuzumab | HER2‐overexpressing breast cancer 5 | HER2 inhibitor 5 | HER2 protein has been found in the rat inner ear 57 | NR |
DISCUSSION
In this review, we present an assessment of monoclonal antibody usage that has resulted in otologic symptoms and reported impact on hearing function. We additionally review each agent's postulated mechanism of action, where available in the literature. Of the 18 agents represented, there were a variety of indications represented, many of which are conditions traditionally managed or comanaged by otolaryngologists. For example, teprotumumab, used in the treatment of thyroid eye disease was the most represented ototoxic agent with 17 out of 44 studies discussing its effects. In addition to the currently published case reports and series, multicenter studies are beginning to emerge echoing these observations of ototoxic adverse events with IGF‐1R pathway inhibition, including Shah et al. who reported patients discontinuing teprotumumab therapy due to hearing loss. The FDA warning label of teprotumumab added risk of hearing impairment in July 2023. 44 , 58 Nivolumab and ipilimumab, involved in T‐cell modulation as a PD‐1 inhibitor and CTLA‐4 inhibitor, respectively, were represented in roughly one‐quarter of ototoxic studies. Like teprotumumab, both of these agents have come under increasing scrutiny for ototoxic adverse events, as discussed in Naples et al.'s review of ototoxic agents. 59
Notably, a select number of monoclonal antibodies have been noted in the literature to be implicated both in ototoxicity and potential therapeutic benefit—TNFα inhibitors like etanercept, golimumab, and infliximab. 60 , 61 , 62 , 63 These agents have been reported to have protective otologic effects for patients afflicted with hearing loss as a result of autoimmune inner ear disease (AIED). The case report by André et al. noted improvement with infliximab therapy in a patient's episodes of bilateral deafness that was refractory to prior attempts of treating with steroids, azathioprine, mycophenolate mofetil, and cyclosporine. 60 The patient's deafness was suspected to have an underlying inflammatory or autoimmune mechanism. Derebery et al. conducted an open‐label trial with golimumab for AIED. 61 Heywood et al. similarly shared a case report of successful AIED treatment with infliximab. 62 Matteson et al.'s open‐label trial found mild efficacy of etanercept in the treatment of immune‐mediated cochleovestibular disorders (IMCVDs) and patients with symptoms of bilateral Meniere's disease. 63 For these mABs, it appears a balance may exist between reduction in TNFα mediated‐inflammatory processes and hypersensitivity‐type vasculitis reactions mediated by TNFα immunocomplexes. Additionally, Plotkin et al. report the utility of bevacizumab in treating hearing loss for patients with neurofibromatosis 2. 64 Rituximab has similarly been reported to have beneficial effects in the treatment of AIED by resolving symptoms of hearing loss. 65 In these studies, indications for audiometric evaluation, where reported, included assessment of symptomatic hearing loss for infliximab, and per study protocol for bevacizumab, etanercept, and golimumab. Further study is needed to ascertain the optimal dosing of such agents to minimize adverse reactions and maximize therapeutic benefit. Additionally, although these reactions may largely be sporadic in nature, investigation to understand which of the anti‐CD20 agents and TNFα inhibitors are more prone to these unfavorable complications than others can further optimize their potentially therapeutic effects for patients.
Agents such as those reviewed in this article pose challenging decisions to providers in the balance of therapeutic benefit and unforeseen adverse effects. Some agents have strong evidence underlying their effects, although others can have a dichotomous response with ototoxic implications as well as a potentially positive impact in immune‐modulated SNHL. Many monoclonal antibodies may be originally prescribed by other specialists, such as those used for the treatment of melanoma or lung cancer, which may leave otolaryngologists to wrestle with the balance of harm and benefit by discontinuing therapy in the setting of adverse events. Others, such as teprotumumab, may place some otolaryngologists in the unique position of reconciling between the two conditions at hand. As the medication class of monoclonal antibodies continues to quickly expand, otolaryngologists may be increasingly called upon to weigh in on such effects from the academic to community level.
As shown in Table VI , there exist a myriad of postulated mechanisms of these events, but each relates to the intracochlear immune response. Otolaryngologists should remain mindful of this cochlear immune mechanism, and there exists an opportunity for otolaryngologists to educate colleagues and patients in regard to the relationship of the immune response within the inner ear. Currently, no clear pattern or definitive paradigm exists for adverse events with monoclonal antibodies and their management, as these agents have been implicated in both steroid‐ and nonsteroid‐responsive immune‐mediated hearing loss. The impact of hearing symptoms must be contextualized to the nature and severity of both the otologic effects and the underlying indication for mAB treatment. However, most of the existing reports remain subjective and unaccompanied by objective audiometric testing. Collaboration between otolaryngologists and audiologists should be encouraged in the management of these emerging symptoms, and as a field, it is critical to continue encouragement of formal, robust analysis of these ototoxic events in both industry and academia to help guide clinical assessment.
There are limitations to be noted with this work. From a demographics standpoint, the representation of female patients within the sample is not aligned with that of the general population. Regarding the results, audiometric data were not consistently available, limiting the quantifiable assessments, meta‐analysis, and cross‐comparison of effects that could be performed across agents. The methodology by which ototoxicity is defined remains heterogenous, and as the usage of these agents continues to expand, there is a need to standardize the metrics employed in assessment and reporting of events with monoclonal antibodies that have the potential for otologic effects. Ideally, audiometric data should be recorded prior to the start of treatment and periodically throughout the course of therapy. Should ototoxic symptoms present, data should additionally be obtained following drug cessation and/or treatment with steroids to assess return to baseline audiometry. Ultrahigh‐frequency (>8 kHz) audiograms, in particular, should be performed for optimal characterization of hearing deficits if present, as serial hearing assessment at the highest audible frequencies using these thresholds allows early detection of ototoxicity before speech frequencies are impaired. 66 Consistent monitoring should be encouraged for ototoxic symptoms by both patients and providers. Further work should additionally involve deeper investigation into the underlying mechanisms employed by each agent to produce ototoxicity. While many of the agents discussed in this review have postulated mechanisms of action reported in the literature, a number remain whose mechanisms have yet to be characterized. Ultimately, this review underscores the need for a greater collection of concrete and quantifiable data to build the body of knowledge pertaining to the toxicity of immunomodulatory agents.
CONCLUSION
As monoclonal antibody usage continues to expand, it is critical to understand their broader implications and adverse effects. This review highlights a wide variety of immunomodulatory agents that have been reported as having potential for ototoxicity. However, testing of such effects remains heterogeneous and further audiometric assessment under standardized conditions is required to fully characterize the effects of these therapies. Nevertheless, providers should be aware of these potential symptoms as they encounter patients undergoing treatment with this expanding class of medications.
Supporting information
Table S1. Reasons for study exclusion.
Editor's Note: This Manuscript was accepted for publication on August 28, 2024.
This article was presented at the Triological Society meeting at the Combined Otolaryngology Spring Meetings (COSM) in Chicago, Illinois, USA; May 15–19, 2024.
The authors have no funding, financial relationships, or conflicts of interest to disclose.
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Associated Data
Supplementary Materials
Table S1. Reasons for study exclusion.