By varying subtype combinations, we found that FAM134B and KIF1A function best in stratefying cancers according to ER status, and ALCAM and KIF2C act as the identifiers of triple negative cancers; while FAM134B and ALCAM express relatively higher in ER+ or non-TNG subtypes, KIF1A and KIF2C have comparatively lower expression in tumors of these classes (Fig. 7). This evidence concerns the gene RETREG1 and cancer.