PEBP1 and breast cancer: In TCGA breast cancer samples (figure 2c) and in other TCGA cancer types (electronic supplementary material, figure S5b), ssGSEA scores of RKIP pathway metastasis signature (RPMS) correlated negatively with RKIP, while those of BACH1 pathway metastasis signature (BPMS) correlated positively with BACH1.