Other defects in homologous recombination repair genes, such as EMSY, RAD51, ATM, ATR, Fanconi anemia, BARD1, BRIP1, PALB2, RB1, NF1, CDKN2A, and the suppression of BRCA1 transcriptional activation through gene methylation, are associated with homologous recombination deficiency (HRD) [15,16]. The gene discussed is RB1; the disease is Fanconi anemia.