KISS1R and neoplasm: There was no significant difference in KISS protein (Figure 4C) and GPR54 expression (Figure 4D) levels between tumor histopathological types (Kruskal-Wallis test; protein: H(5, N = 214) = 0.752; p = 0.980; receptor H(5, N = 214) = 3.366; p = 0.644).