PECAM1 and neoplasm: Immunohistochemical staining shows that the tumour cells were positive for CD31, D2‐40, Vimentin, and Factor VIII (Figure 1H), while negative for CKAE1/AE3, CK7, CK20, EMA, TTF‐1, Napsin A, Synaptophysin, Chromogranin, CD56, HMB45, PAX8, WT1, CD34, P63, P40, CK5/6, ER, Calretinin, and Desmin.