fifty bronchopulmonary tumors were studied by light and electron microscopy : 39 carcinomas ( 25 small cell carcinomas , 8 undifferentiated carcinomas , 6 poorly differentiated squamous cell carcinomas ) and 11 carcinoid tumors ( 5 central , 4 peripheral , 1 atypical , 1 of the tumorlet type ) .
C0007097
carcinomas
C0262584
small cell carcinomas