A2M and ovarian cancer: In addition, several proteins which previously have been shown to be elevated in the serum of ovarian cancer patients such as Chitinase-3-like protein 1(CHI3L1) [Rsc = 4.5], Haptoglobin (HP) [Rsc = 4.0] and Alpha-2-macroglobulin (A2M) [Rsc = 2.5] were elevated in CR.