MKI67 and small cell lung carcinoma: Accordingly, neuroendocrine carcinomas, which show high proliferative activity as reflected by Ki67 labeling index (LI) over 20%, are treated with cisplatin-etoposide combination chemotherapy similarly to small cell lung cancer (SCLC) [7,8], whereas most ileal neuroendocrine tumors are slowly growing neoplasms, which mainly depend on angiogenesis for their maintenance and growth [9,10,11,12,13,14].