In addition, while cholecystokinin receptors (CCKR) have been associated with multiple tumor types, the expression of CCKR type 1 receptors (CCK1R) was described in the kidneys of rodents [23] and humans [22], and cholecystokinin type 2 receptors (CCK2R) were detected in the tubules of rodents [21,23,24]. Here, CCKBR is linked to neoplasm.