Best cGVHD response. The best cGVHD response was measured based on the 2005 NIH response criteria in patients with cGVHD (N = 42). The 5 patients who had no response assessment during the study are included in the denominator in this intent-to-treat analysis. Reasons for discontinuing the study before a response assessment included toxicity (n = 4) and noncompliance with study drug (n = 1).PD, progressive disease; SD, stable disease.