A Prospective, US-based Study Assessing Mogamulizumab-associated Rash in Patients Diagnosed With Mycosis Fungoides or Sezary Syndrome and Treated With Standard of Care Mogamulizumab

This study is being done to assess mogamulizumab-associated rash in patients diagnosed with mycosis fungoides or sezary syndrome and treated with standard of care mogamulizumab. One of the most common side effects of mogamulizumab is a rash, currently named mogamulizumab-associated rash (MAR) which can look like MF or SS. However, mogamulizumab-associated rash (MAR) does not indicate failure of mogamulizumab, and may be a sign that the drug is working. If not properly evaluated, mogamulizumab-associated rash (MAR) could be misinterpreted as worsening of mycosis fungoides/sezary syndrome, which could lead doctors to recommend stopping mogamulizumab treatment early. The information learned by doing this research study may help tell the difference between mogamulizumab-associated rash (MAR) (sometimes also called "drug eruption") and worsening of the disease. It may also help to uncover information about the cause of mogamulizumab-associated rash (MAR).

NCT Number	NCT07003100
Lead Sponsor	City of Hope Medical Center Collaborators: National Cancer Institute (NCI)
Conditions	Recurrent Mycosis Fungoides, Recurrent Sezary Syndrome, Refractory Mycosis Fungoides, Refractory Sezary Syndrome, Stage IB Mycosis Fungoides and Sezary Syndrome AJCC v8, Stage IIA Mycosis Fungoides and Sezary Syndrome AJCC v8, Stage IIB Mycosis Fungoides and Sezary Syndrome AJCC v8, Stage III Mycosis Fungoides and Sezary Syndrome AJCC v8 +1 more
Enrollment	100 participants
Start Date	2024-12-06
Primary Completion	2026-10-19 (estimated)
Study Completion	2026-10-19 (estimated)
Updated on ClinicalTrials.gov	2025-09-09