Follow-up Study to Evaluate the Safety and Efficacy of FCN-159 in Pediatric Participants With Neurofibromatosis Type 1

FCN-159 (Luvometinib Tablets), an orally available and highly potent selective inhibitor of MEK1/2,demonstrated good tolerability and exhibited notable anti-tumor activity in pediatric pts with NF1-related PN in study NCT04954001.This study is a 5-year long-term follow-up of the FCN-159-002 study, involving all enrolled patients to further assess safety, growth and development effects, and treatment efficacy.