“…However, we did not observe a consistent increase in the risk of esophageal cancer in our study. Neither could we confirm the excess risk of bladder cancer observed in US cohort studies of dry cleaners (4,5), and in US and Canadian case-referent studies of nonwhite dry cleaners, ironers, and pressers (23) and laundry personnel (24). Our negative results may be explained by differences in exposure circumstances between North America and Sweden, as well as by dilution due to the inclusion of launderers, who have less solvent exposure than dry cleaners.…”