Clinical studies of lung cancer of atomic bomb survivors, 2

According to the opportunity of discovering lung cancer, 184 atomic bomb survivors with lung cancer could be divided into 97 survivors discovered by the annual medical examination for atomic bomb survivors (Group 1) and 87 survivors discovered by the other opportunities (Group 2). From the viewpoint of clinical stage, stage I was the most frequent in Group 1 (55 of the 97 survivors, 56.7%); stage IV was the most frequent in Group 2 (29 survivors, 33.3%), followed by stage I (26 survivors, 29.9%). This showed the significantly higher proportion of stage I in Group 1 than in Group 2. The rate of operation was higher in Group 1 (44.3%) than in Group 2 (13.8%). Five-year survival rate was 15.7% in Group 1 and 1.7% in Group 2, showing more favorable prognosis in Group 1 than in Group 2. The median survival months were approximately two times longer in Group 1 (19 months) than in Group 2 (10 months). (Namekawa, K.)