PROM2 and breast cancer: Meanwhile, their protein expression levels in breast cancer tissue showed a similar trend: BCAP31 displayed moderate cytoplasmic positivity in most malignant cells, especially in BC; BMF displayed moderate-to-strong cytoplasmic positivity; PROM2 displayed moderate-to-strong membranous and cytoplasmic positivity; GLUL was mainly negative in malignant cells, but moderate-to-strong staining also could be observed in some cases of BC and colorectal cancers: NFKBIA/PARP3 with weak cytoplasmic positivity (Figure S2G).