Synchronous double primary lung cancers via p53 pathway induced by heavy smoking.
Differences in the histological manifestation of synchronous lung cancers are rare. Synchronous multiple primary lung cancers (SMPLC) are associated with long-term tobacco use, which could independently lead to mutations in the p53 and K-ras genes. We present the case of an 82-year-old man who smoked 30 cigarettes daily for the past 60 years. CT of the chest showed a right upper lobe mass. Bronchoscopy revealed an intra-lumen nodular lesion in the right lower lobe bronchus. The diagnoses of small cell lung carcinoma (SCLC) of the right upper lobe and non-small cell lung carcinoma (NSCLC) of the right lower lobe were confirmed by the morphologic features and the detected immunoreactivity. Immunohistochemical analyses showed a strong positive reaction for p53 in samples of the SCLC and NSCLC. The cancers had a different phenotype, but similar genetic abnormalities may have developed due to the carcinogens in the cigarettes.
Lin
Cheng-Chih
CC
Division of Pulmonary and Critical Care, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan.
Chian
Chih-Feng
CF
Perng
Wann-Cherng
WC
Cheng
Ming-Fang
MF
D000369:Aged, 80 and over; D001999:Bronchoscopy; D002289:Carcinoma, Non-Small-Cell Lung / Q000209:etiology* / Q000235:genetics; D016158:Genes, p53 / Q000187:drug effects* / Q000235:genetics; D006801:Humans; D007150:Immunohistochemistry; D008175:Lung Neoplasms / Q000209:etiology* / Q000235:genetics; D008297:Male; D009154:Mutation; D009378:Neoplasms, Multiple Primary / Q000209:etiology* / Q000235:genetics; D010641:Phenotype; D012307:Risk Factors; D055752:Small Cell Lung Carcinoma / Q000209:etiology* / Q000235:genetics; D012907:Smoking / Q000009:adverse effects*; D013997:Time Factors