Extended Treatment and Follow-up of Subjects Treated With Belumosudil in Study KD025-208 or Study KD025-213

This is a Phase 2, open-label, long-term treatment and follow-up study in subjects with cGVHD who have been previously treated with belumosudil in Study KD025-208 or Study KD025-213. Subjects will not be screened. Subjects who have signed the informed consent form will be enrolled in Study KD025-217 if they have met 1 of the following conditions: * Actively receiving belumosudil or in long-term follow-up (LTFU) in Study KD025-208 or Study KD025-213 * Enrolled in the Companion Study as specified in Study KD025-213 Amendment 2 and received at least 6 months of treatment or is in LTFU Approximately 20 Study Centers will participate with approximately 70 subjects participating overall.