ATP2B1 and neoplasm: Gene chip microarray data showed that ATP2B4 was predominantly over-expressed (2.65-fold, n = 39, p < 4.06−10) to a much greater extent than ATP2B1 (1.24-fold, n = 39, p < 0.035) in human PDAC tumors versus resected healthy tissue from the tumor margin (Badea et al., 2008).