Endocrine and multiple sclerosis outcomes in patients with autoimmune thyroid events in the alemtuzumab CARE-MS studies.

Background: Alemtuzumab is an effective therapy for relapsing multiple sclerosis. Autoimmune thyroid events are a common adverse event.
Objective: Describe endocrine and multiple sclerosis outcomes over 6 years for alemtuzumab-treated relapsing multiple sclerosis patients in the phase 3 CARE-MS I, II, and extension studies who experienced adverse thyroid events.
Methods: Endocrine and multiple sclerosis outcomes were evaluated over 6 years. Thyroid event cases, excluding those pre-existing or occurring after Year 6, were adjudicated retrospectively by expert endocrinologists independently of the sponsor and investigators.
Results: Thyroid events were reported for 378/811 (46.6%) alemtuzumab-treated patients. Following adjudication, endocrinologists reached consensus on 286 cases (75.7%). Of these, 39.5% were adjudicated to Graves' disease, 2.5% Hashimoto's disease switching to hyperthyroidism, 15.4% Hashimoto's disease, 4.9% Graves' disease switching to hypothyroidism, 10.1% transient thyroiditis, and 27.6% with uncertain diagnosis; inclusion of anti-thyroid antibody status reduced the number of uncertain diagnoses. Multiple sclerosis outcomes of those with and without thyroid events were similar.
Conclusion: Adjudicated thyroid events occurring over 6 years for alemtuzumab-treated relapsing multiple sclerosis patients were primarily autoimmune. Thyroid events were considered manageable and did not affect disease course. Thyroid autoimmunity is a common but manageable adverse event in alemtuzumab-treated relapsing multiple sclerosis patients. ClinicalTrials.gov Registration Numbers: CARE-MS I (NCT00530348); CARE-MS II (NCT00548405); CARE-MS Extension (NCT00930553).
Competing Interests: CMD has received compensation for serving on an advisory board and/or speaking fees (Sanofi). BL has nothing to disclose. IM has received honoraria and travel expenses for lecturing (Sanofi). SG has nothing to disclose. SFH has received consulting agreements, speaker honoraria, and grant/research financial support (AbbVie, Acorda, Actelion, Adamas, Avanir, Bayer, Biogen, Novartis, Osmotica, Questcor, Roche, Sanofi, Synthon, and Teva). KWS has received consulting and/or speaking fees (Biogen, Merck, Novartis, Roche, Sanofi, and Synthon). H-PH has received consulting and/or speaking fees (Bayer, Biogen, BMS Celgene, CSL Behring, GeNeuro, Horizon Therapeutics, Merck Serono, Novartis, Octapharma, Roche, Sanofi, and TG Therapeutics). EKH has received honoraria and grant support (Actelion, Biogen, Merck Serono, Novartis, Receptos, Roche, Sanofi, and Teva), and support (Ministry of Education of Czech Republic [PROGRES Q27/LF1]). CCL has received compensation for consulting (Acorda Therapeutics, Bayer, Biogen, Cephalon, EMD Serono, Novartis, Pfizer, Questcor, Sanofi, Strativa, Teva, and UCB). TZ has received consulting and/or speaking fees (Almirall, Bayer, Biogen, Merck, Novartis, Roche, Sanofi, and Teva) and grant/research support (Biogen, Novartis, Sanofi, and Teva). BVW has received advisory board and/or speaking fees (Almirall, Biogen, Merck, Novartis, Roche, and Sanofi); research support (Biogen, Merck, Novartis, and Sanofi), and contracted research (PI) (Biogen, Merck, Sanofi, Novartis, and Roche). SGM has received honoraria for lecturing, travel expenses for attending meetings, and financial research support (Almirall, Amicus Therapeutics, Bayer HealthCare, Biogen, Celgene, Diamed, HERZ Burgdorf, Merck Serono, Novartis, Novo Nordisk, ONO Pharma, Roche, Sanofi, and Teva). DHM and EMP were employees of Sanofi during study conduct and analysis, and may hold shares and/or stock options in the company. DPB is an employee of Sanofi and may hold shares and/or stock options in the company. PAS has received grant research support (Novo Nordisk). The adjudicators (CMD, BL, and PAS), and IM and SG who assisted CMD), received no compensation for review of the cases reported in this study.
(© The Author(s), 2023.)