From April 1986 to April 1987, two groups of patients with esophageal and car- diac carcinoma were studied. Most of them were heavy smokers with a history of chronic bronchitis and/or pulmonary emphysema.

• 我院从1986年4月至1987年4月对2组食管、贲门癌患者,有长期吸烟史,患有“慢支”及肺气肿的病人,进行了临床研究观察。