于1989年8月开始对炼油厂1971年1月在册职工进行了肿瘤回顾性调查。观察期1971年1月～1988年12月。对照人群为上海市民1978～1982年恶性肿瘤死亡资料。恶性肿瘤死前诊断级别:Ⅰ级13.33％,Ⅱ级82.86％,Ⅲ级3.81％,Ⅳ级为零。在观察期内队列人员为3369人,累计人年数为50957人年,失访率4.7％,总死亡人数为241人。18年中肿瘤死亡105人,预期死亡数115人,SMR0.91.P>0.05, In August 1989, a retrospective investigation was conducted on the staff of the refinery in January 1971. The observation period was from January 1971 to December 1988. The control population was the death of malignant tumors in Shanghai from 1978 to 1982. The pre-death diagnostic levels of malignancies were: 13.33% in grade I, 82.86% in grade II, 3.81% in grade III, and grade IV was zero. In the observation period, there were 3,369 people in the queue, and the accumulated number of people was 50,957 person-years. The loss rate was 4.7%, and the total death toll was 241. In the 18 years, there were 105 cancer deaths and 115 expected deaths. SMR 0.91.P>0.05.