苯对人的致白血病作用是不容置疑的。其证据如下:1.在土耳其的伊斯坦布尔,接触苯的制鞋工中,8年内白血病的发病率是13.6/10万,该发病率显著高于普通居民白血病发病率。2.在该城市,停止使用苯后,工人白血病发病人数减少,并且以后的3年已没有发生白血病的报道。3.在51例各类血细胞减少的苯作业工人中,有13例发展成白血病。4.苯接触组和非接触组白血病发生率差异如下:前 Benzene on human leukemia effect is beyond doubt. The evidence is as follows: 1. In Istanbul, Turkey, exposure to benzene shoe-making workers, the incidence of leukemia in 8 years was 13.6 / 100 000, the incidence was significantly higher than the incidence of leukemia ordinary residents. 2. In the city, after the cessation of benzene use, the number of workers with leukemia decreased, and no leukemia has been reported for the next three years. In 51 cases of various types of cytopenias benzene workers, 13 cases developed into leukemia. 4. Benzene exposure group and non-exposure group the incidence of leukemia are as follows: before