方法：以炼焦工人68例为接触组，无任何职业致癌物接触史的健康体检者30例为对照组。
Methods: 68 coke oven workers were chosed as exposing group and 30 health people without any occupational exposure history of carcinogen were chosed as the control group.
方法采用外周血淋巴细胞培养和染色体G显带分析，对612对有异常孕产史的夫妇进行染色体检查。
Methods Chromosomal analysis was made in 612 married couples with a history of abnormal pregnancy outcome by peripheral lymphocytes culture and G-banding.
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