CDCP1 and neoplasm: Tumors were considered positive when ≥ 10% of tumor cells showed membrane reactivity (Figure 6A) (mean CDCP1-positive tumor cells/section = 52%, range 10% to 100%); 57% (57/100) of cases were CDCP1-positive, 63% (36/57) of which expressed CDCP1 in ≥ 50% of tumor cells (Figure 6B).