Overall survival in the various sets according to limited/extensive, low/intermediate/high risk, and mild/moderate/severe grading.

Panel A shows IBMTR-1 training set; panel B, IBMTR-2 validation set; and panel C, NMDP validation set. Blue (a) indicates best risk; green (b), intermediate risk; red (c), worst risk; and black (d), no chronic GVHD.