However, we did not observe the immune scores to be significantly different across APOBEC3B copy number in the smaller sample set of breast cancers from TCGA with A3Bdel/del, A3Bdel/wt, and A3Bwt/wt breast cancers with median immune scores of −45, 273 and −13, respectively (Fig. 2). Here, APOBEC3B is linked to breast carcinoma.