AREG, AREG/EGF ratio, OS, and NRM after LA GVHD. Boxplot of (A) AREG and (B) AREG/EGF ratio in LA GVHD cases vs controls. (C) OS and (D) NRM (d) by AREG/EGF ratio. *Cohort 1, LA GVHD vs matched control comparison from national Chronic GVHD Consortium; cohort 2, validation cohort of patients with LA GVHD at onset from the Mount Sinai Acute GVHD International Consortium (MAGIC).