European journal of haematology · 2026
Efficacy and Tolerance of Cladribine for Non-Langerhans Cell Histiocytosis.
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Riller Quentin, Ben Salem Thouraya, Emile Jean-François, Charlotte Frédéric, Idbaih Ahmed, Faucher Benoît, De Almeida Sébastien, Martin-Blondel Guillaume, Tazi Abdellatif, Donadieu Jean, Riviere Etienne, Samson Maxime, Souffir Camille, Amoura Zahir, Haroche Julien, Cohen-Aubart Fleur
Аннотация
BACKGROUND: Erdheim-Chester Disease (ECD) and Rosai-Dorfman Disease (RDD) Are Rare Non-Langerhans Cell Histiocytoses That Share Several Clinical and Histological Features, Including the Accumulation of CD1a- Histiocytes in Organs. Cladribine, a Purine Analog, Leads to an Overall Response Rate (ORR) of 91% in Langerhans-Cell Histiocytoses. Whether the Same Results Could Be Obtained in Non-Langerhans Cell Histiocytoses Remains To Be Determined.
PATIENTS AND METHODS: We retrospectively assessed the efficacy of cladribine according to clinical and radiological responses in consecutive patients with a diagnosis of ECD, RDD, or non-classified non-Langerhans cell histiocytosis.
RESULTS: Twenty-One Patients Were Included in This Study (17 Males, Median Age at Cladribine Treatment 53 Years). The Clinical ORR Was 62% (44% in ECD, 70% in RDD), whereas the Radiological ORR Was 43% (44% in ECD, 30% in RDD). Four of Five Patients With Cranial Nerve Palsy Responded Clinically (80%), whereas Pseudo-Degenerative CNS Involvement Did Not Improve (n = 3). Six Patients With Multisystemic Involvement Did Not Require Additional Treatment After Achieving a Radiological Response (n = 4) or After Achieving Radiological Stable Disease (n = 2), with a Median Follow-Up of 2.3 Years (Range 0.5-9.5). After They Achieved a Radiological Response, 4/9 (44%) Patients Relapsed in a Median Time of 18 Months (Range 6-95). The Safety Profile Showed That 19/19 Patients Experienced Lymphopenia, Whereas Only 2/19 Had Clinical Infectious Events (9%).
CONCLUSIONS: These Results Provide New Evidence of the Efficacy of Cladribine in Non-Langerhans Cell Histiocytosis and Brings New Data on the Safety Profile of This Drug in Histiocytoses.
PATIENTS AND METHODS: We retrospectively assessed the efficacy of cladribine according to clinical and radiological responses in consecutive patients with a diagnosis of ECD, RDD, or non-classified non-Langerhans cell histiocytosis.
RESULTS: Twenty-One Patients Were Included in This Study (17 Males, Median Age at Cladribine Treatment 53 Years). The Clinical ORR Was 62% (44% in ECD, 70% in RDD), whereas the Radiological ORR Was 43% (44% in ECD, 30% in RDD). Four of Five Patients With Cranial Nerve Palsy Responded Clinically (80%), whereas Pseudo-Degenerative CNS Involvement Did Not Improve (n = 3). Six Patients With Multisystemic Involvement Did Not Require Additional Treatment After Achieving a Radiological Response (n = 4) or After Achieving Radiological Stable Disease (n = 2), with a Median Follow-Up of 2.3 Years (Range 0.5-9.5). After They Achieved a Radiological Response, 4/9 (44%) Patients Relapsed in a Median Time of 18 Months (Range 6-95). The Safety Profile Showed That 19/19 Patients Experienced Lymphopenia, Whereas Only 2/19 Had Clinical Infectious Events (9%).
CONCLUSIONS: These Results Provide New Evidence of the Efficacy of Cladribine in Non-Langerhans Cell Histiocytosis and Brings New Data on the Safety Profile of This Drug in Histiocytoses.