The expression of the proteins encoded by these genes, namely, breast cancer type 2 susceptibility protein (BRCA2), protocadherin Fat 1 precursor (FAT1), protocadherin Fat 3 precursor (FAT3), and protocadherin Fat 4 precursor (FAT4), was examined in 11 resected acinar cell carcinomas using FFPE tissues. Here, FAT4 is linked to acinar cell carcinoma.