Cumulative incidence frequencies of sclerosis in patients with chronic GVHD. Results are shown (A) according to the presence or absence of the HLA-DPA1*01:03∼DPB1*04:01 haplotype in the recipient, and (B) according to presence or absence of HLA-DPA1 and HLA-DPB1 alleles encoding heterodimers with a Q∼GPM P1 pocket. Solid lines represent groups with the haplotype or P1 pocket, and dotted lines represent groups without the haplotype or P1 pocket.