BICDL2 and pure red-cell aplasia: In addition to the genes previously mentioned, BICDL2, LLCFC1, LENG8, KMT2B, AP5Z1, and ATAD3B were also found to be IRRGs significantly associated with PRCA prognosis in this study, which were proposed to have vital roles in the response to immunotherapy in PRCA and require further study.