The detailed work histories of the individual workers composing the Pliofilm cohort represent a unique resource for estimating the dose‐respoonse for leukemia that may follow occupational exposure to benzene. In this paper, we report the results of analyzing the updated Pliofilm cohort using the proportional hazards model, a more sophisticated technique that uses more of the available exposure data than the conditional logistic model used by Rinskyet al.The more rigorously defined exposure estimates derived by Paustenbachet al.are consistent with those of Crump and Allen in giving estimates of the slope of the leukemogenic dose‐response that are not as steep as the slope resulting from the exposure estimates of Rinskyet al.We consider estimates of 0.3‐0.5 additional leukemia deaths per thousand workers with 45 ppm‐years of cumulative benzene exposure to be the best estimates currently available of leukemia risk from occupational exposure to benzene. These risks were estimated in the proportional hazards model when the exposure estimates of Crump and Allen or of Paustenbachet al.were used to derive a cumulative concentration‐by‐
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