In this study, we identified 187 commonly changed genes in CRC samples from the GSE 25070 (USA), GSE 41258 (Israel), GSE 44076 (Spain) and GSE 44861 (USA) datasets (Figure 3A), including CA1, which was also found to have low expression in a TCGA CRC dataset (Figure 3B). The gene discussed is CA1; the disease is colorectal carcinoma.