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Ann Thorac Surg 1999;67:1451-1455
© 1999 The Society of Thoracic Surgeons
a Division of Thoracic Oncology, National Cancer Center Hospital East, Kashiwa, Japan
b Pathology Division, National Cancer Center Research Institute East, Kashiwa, Japan
Accepted for publication November 20, 1998.
Address reprint requests to Dr Sekine, Division of Internal Medicine and Thoracic Oncology, National Cancer Center Hospital, Tsukiji 5-1-1, Chuo-ku, Tokyo 104-0045, Japan
e-mail: isekine{at}gan2.ncc.go.jp
Background. Lung cancer in younger people is uncommon and has characteristics that distinguish it from cancer in older patients. The percentage of smokers among younger patients ranges from 40% to 50% in Asia to 90% in Western countries. The prognosis for young patients with this disease is controversial.
Methods. Medical records of 91 young (40 years of age or younger) and 3,221 older (more than 40 years of age) Japanese patients with lung cancer were reviewed to compare smoking habits, distribution of histopathologic types, clinical stage, and survival.
Results. Among female patients, only 39% were smokers in both age groups, whereas smokers were less common among the young male patients (84%) than the older male patients (95%) (p < 0.0001). Adenocarcinomas were diagnosed in 92% of the young and 73% of the older female patients (p = 0.021) versus only 71% and 42% of the corresponding male patients (p < 0.0001). There was no difference in tumor extent or survival between the two groups of female patients. In the male groups, advanced disease (stages IIIB and IV) was more common in the young patients (75%) than in the older patients (54%) (p = 0.0031), but there was no survival difference between the two groups.
Conclusions. Young male and female lung cancer patients in Japan have different characteristics from each other and from older patients of the same sex. Their survival did not differ from that of older patients.
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