B7981015 with >30 days between first visit in B7981032 and last dose in the prior study:
- Clinical diagnosis of alopecia areata (AA) with no other cause of hair loss.
Androgenetic alopecia coexistent with AA is allowed.
- >=25% hair loss of the scalp due to AA, including alopecia totalis and alopecia
universalis
- No evidence of terminal hair regrowth within 6 months
- Current episode of hair loss
B7981015 with >30 days between first visit in B7981032 and last dose in the prior study:
- Other types of diseases that can cause hair loss or that could interfere with
assessment of hair loss/regrowth
- Participants with shaved heads must not enter the study until hair has grown back & is
considered stable by the investigator
All participants:
- Participants who have previously taken Janus kinase (JAK) inhibitors other than
PF-06651600 must have received the last dose >12 weeks prior to the screening visit