PCDHA4 and metastatic neoplasm: We found significantly different expressions for PCDHA12 (P = 0.021) and PCDHA4 (P < 0.001) in the ARMS and ERMS cell lines (Fig. 2a), and we found statistically significant different expression levels of PCDHA4 (P = 0.030) and PCDHB7 (P = 0.004) in the metastatic tumor samples (IV stage) with respect to the non-metastatic ones (I-II-III stage) (Fig. 2b).