Annals of oncology : official journal of the European Society for Medical Oncology · 2026
A chemotherapy-free, pathological response-adapted strategy using trastuzumab-pertuzumab and T-DM1 in HER2-positive early breast cancer: the PHERGain-2 study.
СтатьяМногоцентровое исследованиеКлиническое исследование II фазыНазвание и аннотация: Перевод в очереди
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Garrigós L, Ruiz-Borrego M, Pérez-García J M, Guerrero-Zotano A, Cortés-Salgado A, Kuemmel S, Colleoni M, Reboredo-Rendo C, Bermejo B, Blancas I, Gavila J, Fabi A, Morales C, Stradella A, Carañana V, Martínez-de Dueñas E, Albacar C, Ballesteros-Cidras O, Martrat G, Iacobucci S, Boix O, Berenguer-Molins P, Alcalá-López D, Cortés J, Llombart-Cussac A, PHERGain-2 investigators
Аннотация
BACKGROUND: PHERGain-2 is a multicenter, single-arm, phase II study evaluating a pathologic complete response (pCR)-guided de-escalation strategy to omit chemotherapy in selected patients with HER2-positive early breast cancer (EBC).
PATIENTS AND METHODS: Eligible patients were adults, treatment-naive, centrally confirmed HER2-positive (immunohistochemistry 3+), node-negative EBC, with tumors 5-30 mm by magnetic resonance imaging. Patients received eight cycles of neoadjuvant trastuzumab-pertuzumab (HP) (600 mg H + 1200 mg P loading dose, followed by 600 mg H + 600 mg P maintenance dose) every 3 weeks. Patients with hormone receptor (HR)-positive tumors also received endocrine therapy. After surgery, patients received 10 cycles of adjuvant therapy guided by the pathological response: HP for patients with pCR (ypT0/is ypN0) (cohort A), trastuzumab emtansine (T-DM1; 3.6 mg/kg) for patients with residual invasive breast tumors and/or ypN0(i+/mol+), ypN1mi (cohort B), and optional chemotherapy followed by T-DM1 for patients with ypN1-3 (cohort C). Co-primary endpoints were 1-year health-related quality of life (HRQoL) decline (based on the European Organisation for Research and Treatment of Cancer Core Quality of Life questionnaire) and 3-year recurrence-free interval (based on the Standardized Definitions for Efficacy End Points). Key secondary endpoints included overall and HR-specific pCR rates and safety.
RESULTS: From August 2021 to March 2024, 396 patients initiated neoadjuvant treatment, 391 (98.7%) underwent surgery. A total of 236 patients (59.6%) achieved pCR (cohort A). Among those with residual disease, 148 (37.8%) entered cohort B and 7 (1.8%) cohort C. One year after initiation of neoadjuvant treatment, ≥10% decline rate in global HRQoL was 42.8% [95% confidence interval (CI) 36.9% to 48.8%]; 37.3% (95% CI 30.1% to 44.9%) in patients with pCR and 51.9% (95% CI 41.9% to 61.7%) in those with residual disease. Treatment-related adverse events occurred in 86.6% of patients (5.6% grade ≥3). Serious adverse events occurred in 6.1% of patients. One death (0.3%) due to pneumonitis was attributed to T-DM1.
CONCLUSIONS: PHERGain-2 shows meaningful HRQoL preservation, expected HP/T-DM1 toxicity, and an outstanding pCR rate comparable with standard chemotherapy plus HP regimens in this patient population.
PATIENTS AND METHODS: Eligible patients were adults, treatment-naive, centrally confirmed HER2-positive (immunohistochemistry 3+), node-negative EBC, with tumors 5-30 mm by magnetic resonance imaging. Patients received eight cycles of neoadjuvant trastuzumab-pertuzumab (HP) (600 mg H + 1200 mg P loading dose, followed by 600 mg H + 600 mg P maintenance dose) every 3 weeks. Patients with hormone receptor (HR)-positive tumors also received endocrine therapy. After surgery, patients received 10 cycles of adjuvant therapy guided by the pathological response: HP for patients with pCR (ypT0/is ypN0) (cohort A), trastuzumab emtansine (T-DM1; 3.6 mg/kg) for patients with residual invasive breast tumors and/or ypN0(i+/mol+), ypN1mi (cohort B), and optional chemotherapy followed by T-DM1 for patients with ypN1-3 (cohort C). Co-primary endpoints were 1-year health-related quality of life (HRQoL) decline (based on the European Organisation for Research and Treatment of Cancer Core Quality of Life questionnaire) and 3-year recurrence-free interval (based on the Standardized Definitions for Efficacy End Points). Key secondary endpoints included overall and HR-specific pCR rates and safety.
RESULTS: From August 2021 to March 2024, 396 patients initiated neoadjuvant treatment, 391 (98.7%) underwent surgery. A total of 236 patients (59.6%) achieved pCR (cohort A). Among those with residual disease, 148 (37.8%) entered cohort B and 7 (1.8%) cohort C. One year after initiation of neoadjuvant treatment, ≥10% decline rate in global HRQoL was 42.8% [95% confidence interval (CI) 36.9% to 48.8%]; 37.3% (95% CI 30.1% to 44.9%) in patients with pCR and 51.9% (95% CI 41.9% to 61.7%) in those with residual disease. Treatment-related adverse events occurred in 86.6% of patients (5.6% grade ≥3). Serious adverse events occurred in 6.1% of patients. One death (0.3%) due to pneumonitis was attributed to T-DM1.
CONCLUSIONS: PHERGain-2 shows meaningful HRQoL preservation, expected HP/T-DM1 toxicity, and an outstanding pCR rate comparable with standard chemotherapy plus HP regimens in this patient population.