在发达国家 ,随着平均寿命的延长和人口的老龄化 ,高龄患者的患癌和死亡的比例正在增加。回顾日本历年来肺癌的死亡情况 ,60年代 75岁以上者死于肺癌病例分别为男性1 2 % ,女性 1 5% ,1 996年分别为 40 % ,51 % ;依此推测到 2 0 1 5年 75岁以上病例 ,男性将上升到 55%～ 58% , In developed countries, as the average life expectancy increases and the population ages, the proportion of cancer and death among elderly patients is increasing. Recalling the death of lung cancer in Japan over the years, the incidence of lung cancer among those over 75 years of age in the 1960s was 12.2% for males and 15% for females. In 1996, it was 40% and 51% respectively. It is estimated that 2 0 1 5 In cases over 75 years of age, men will rise to 55% to 58%.