MKI67 and neoplasm: The immunophenotype of the tumor was as follows: CgA (+), Syn (+), CKAE1+E3 (+) “dot-like”, S100 (-), calcitonin (-), EMA (+/-), Ki67 3% to 4% in hot spots, no necrosis, mitotic index 0/10HPF with conclusion: thymic NET—typical carcinoid (low-grade).