Percentage of body surface area (BSA) affected by cGVHD during the study period. From month 7 onwards there was a significant difference between PD+SD patients and PR+CR patients (t-test corrected for multiple testing by means of Sidak-Bonferroni method). Comparing start and end of the study PR+CR patients show a significant reduction in BSA affected by cGVHD (paired Wilcoxon matched pairs signed rank test). Mean and s.e.m. are depicted. BSA: Body Surface Area, CR: complete response, PD: progressive disease, PR: partial response, RTX: rituximab, SD: stable disease.