Mortality rates and causes of death among the members of medical staffs, especially medical doctors, have been reported1–2; however, it is not clear whether lung cancer in such patients is at a more advanced stage at presentation than among members of other professions. In order to ascertain the characteristics of lung cancer in medical staffs, we reviewed the medical records of 1,021 lung cancer patients who had presented in our division between 1980 and 2001. There were 21 patients who were medical professionals (2.1%; 13 men; 7 doctors, 6 nurses, 3 dentists, 2 pharmacists, and 3 other technicians). The median age was 73 years (age range, 33 to 84 years). With regard to smoking, 71.4% of these 21 patients and 72.2% of 1,000 patients who had other professions were smokers. There were no differences between the two groups. In the 21 patients, pathologic examination revealed a preponderance of adenocarcinoma (14 patients). A lower frequency of squamous cell carcinoma and small cell carcinoma (SCLC) among the members of the medical profession was striking in contrast to that found in the 1,000 patients with other professions (p = 0.0152 [χ2 test]). Nineteen of the 21 patients who were medical professionals (90.5%) had stage IIIB or IV disease, which was a more advanced-stage disease than that found in the other 1,000 patients (p = 0.0111). Three patients underwent surgical resection, and 10 patients received chemotherapy. Five patients received radiation, and three patients received palliative care.