a new study finds.
From 2009 to 2019, the Food and Drug Administration received 7,978 reports of new-onset alopecia in patients taking DMTs, particularly teriflunomide (3,255, 40.8%; 90% female), dimethyl fumarate (1,641, 20.6%; 89% female), natalizumab (955, 12.0%; 92% female), and fingolimod (776, 9.7% of the total reports; 93% female), several researchers reported at the 2021 Annual Meeting of the Consortium of Multiple Sclerosis Centers (CMSC). Of these, only teriflunomide had previously been linked to alopecia, study coauthor Ahmed Obeidat, MD, PhD, a neurologist at the Medical College of Wisconsin, Milwaukee, said in an interview.
“Our finding of frequent reports of alopecia on DMTs studied calls for further investigation into the subject,” Dr. Obeidat said. “Alopecia can cause deep personal impacts and can be a source of significant psychological concern for some patients.”
According to Dr. Obeidat, alopecia has been linked to the only a few DMTs – cladribine and the interferons – in addition to teriflunomide. “To our surprise, we received anecdotal reports of hair thinning from several of our MS patients treated with various other [DMTs]. Upon further investigation, we could not find substantial literature to explain this phenomenon which led us to conduct our investigation.”
Dr. Obeidat and colleagues identified DMT-related alopecia cases (18.3%) among 43,655 reports in the skin and subcutaneous tissue disorder category in the FDA Adverse Event Reporting System. Other DMTs with more than 1 case report were interferon beta-1a (635, 8.0%; 92% female), glatiramer acetate (332, 4.2%; 87% female), ocrelizumab (142, 1.8%; 94% female), interferon beta-1b (126, 1.6%; 95% female), alemtuzumab (86, 1.1%; 88% female), cladribine (17, 0.2%; 65% female), and rituximab (10, 0.1%; 90% female).
The average age for the case reports varied from 42 to 51 years for most of the drugs except alemtuzumab (mean age, 40 years) and cladribine (average age, 38 years), which had low numbers of cases.
Siponimod (three cases) and ozanimod (no cases) were not included in the age and gender analyses.
Why do so many women seem to be affected, well beyond their percentage of MS cases overall? The answer is unclear, said medical student Mokshal H. Porwal, the study’s lead author. “There could be a biological explanation,” Mr. Porwal said, “or women may report cases more often: “Earlier studies suggested that alopecia may affect women more adversely in terms of body image as well as overall psychological well-being, compared to males.”
The researchers also noted that patients – not medical professionals – provided most of the case reports in the FDA database. “We believe this indicates that alopecia is a patient-centered concern that may have a larger impact on their lives than what the health care teams may perceive,” Mr. Porwal said. “Oftentimes, we as health care providers, look for the more acute and apparent adverse events, which can overshadow issues such as hair thinning/alopecia that could have even greater psychological impacts on our patients.”
Dr. Obeidat said there are still multiple mysteries about DMT and alopecia risk: the true incidence of cases per DMT or DMT class, the mechanism(s) behind a link, the permanent or transient nature of the alopecia cases, and the risk factors in individual patients.
Going forward, he said, “we advise clinicians to discuss hair thinning or alopecia as a possible side effect that has been reported in association with all DMTs in the real-world, postmarketing era.”
No study funding was reported. Dr. Obeidat reported various disclosures; the other authors reported no disclosures.