BRAF and pneumocystosis: Expression patterns of BRAF V600E and beta-catenin reflected the clinicopathological subtypes (BRAF V600E; positive rate, 0% [0/18] in ACP, 90.9% [10/11] in PCP, p < 0.001, nuclear expression of beta-catenin was observed, 100% [18/0] in ACP, 0%[0/11] in PCP, p < 0.001) (Table 1).