PPP1R1B and neoplasm: A pulmonary pathologist (A.C.R.)scored the percentage of positive tumor cells and their staining intensity of DARPP-32 only and both isoforms (DARPP-32 and t-DARPP) using a scale of 0–3 (i.e., 0 = none, 1 = weak, 2 = moderate, 3 = strong expression).