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目的：进一步深入研究炼焦工职业性肺癌的发病规律，为防治提供科学依据。方法：对焦化厂和煤气厂工人进行长期追踪流调，观察职业性肺癌SMR值增长态势。结果：在25年间进行3次追踪流调，结果表明：SMR值随厂龄和工龄的增长而显著上升。结论：SMR值不是一个常数，而是一个变量．任何企业不能仅根据一次流调来评价职业性肺癌的危害性。
Objective: To further investigate the incidence of occupational lung cancer in coking workers and provide a scientific basis for prevention and treatment. Methods: Long-term follow-up of the coking plant and gas factory workers was conducted to observe the growth of SMR in occupational lung cancer. Results: Three follow-up tests were conducted over 25 years. The results showed that SMR increased significantly with age and length of service. Conclusion: SMR value is not a constant, but a variable. No business can only evaluate the dangers of occupational lung cancer based on a first-rate episode.