Cancer Deaths in a Cohort of Japanese Barbers in Aichi Prefecture

Abstract

Barbers have frequent occasion to come in contact with hair and beauty products that contain many chemicalsubstances, which could have harmful effects on health. Subjects were barbers belonging to the Barbers’ Unionof Aichi Prefecture who responded to a questionnaire in 1976. Deaths from all sites of cancers in the subjectswere observed over 27 years. Mortalities of several cancers in the subjects were compared with individuals inthe Japanese population, calculating standardized mortality ratios (SMRs) using the general Japanese populationas a standard. Subjects included 8,360 people (4,674 men). There were a total of 551 deaths (469 men) duringthe follow-up period, and 277 deaths (211 men) from all cancers. The male and female SMRs (95%CI) were 0.62(0.58-0.66) and 0.25 (0.16-0.34) for all deaths, 0.46 (0.39-0.53) and 0.41 (0.35-0.53) for all cancers combined, 0.49(0.35-0.63) and 0.40 (0.12-0.68) for stomach, 0.40 (0.24-0.56) and 0.30 (0.10-0.70) for lung, 0.56 (0.39-0.73) and0.26 (0.02-0.76) for liver, 0.38 (0.16-0.60) and 0.30 (0.07-0.67) for colon, and 0.48 (0.08-0.88) and 0.22 (0.04-0.79)for blood cancers, respectively, with significantly fewer deaths than in the general population. The femaleSMRs were 0.90 (0.74-1.06) for breast and 0.55 (0.06-1.04) for ovarian cancer, lacking significance. Thus, noexcess mortality of any cancer sites was observed compared with the general population in both Japan overalland in Aichi Prefecture.