ERBB2 and breast neoplasm: Using the Gene Set Analysis (GSA)-Tumor application to interrogate the expression of TRPV4 in 1881 breast tumor samples, TRPV4 expression was found to be significantly higher in basal subtype compared to the HER2, Lum A and Lum B subtypes of tumors (p < 0.001) (Fig. 2a, top left panel).