according to the histological classification system for lung tumor , who , 1981 , small cell carcinoma is divided into three subtypes : ( 1 ) oat cell carcinoma ( 118 cases ) , ( 2 ) intermediate cell type ( 55 cases ) , and ( 3 ) mixed oat cell carcinoma ( 29 cases ) .
C0024109
lung
C0149925
small cell carcinoma