According to Alopecia Areata Canada, alopecia is the loss or the absence of hair. Alopecia areata is an autoimmune disease in which the immune system, for unknown reasons, attacks the hair root and causes hair loss. There are many types of alopecia with alopecia areata being the most common type. This form of alopecia usually presents with round, smooth patches of various sizes of hair loss. The duration of alopecia areata varies – it may resolve spontaneously within weeks or be recurrent over a lifetime.
B7981032 is a Phase 3 Open-Label, Multi-Center, Long-Term Study Investigating the Safety and Efficacy of PF-06651600 in Adult and Adolescent Participants with Moderate to Severe Alopecia Areata.