Breast cancer mortality among PVC fabricators.

A case-control analysis of breast cancer deaths among PVC fabricators is presented. This study is an extension of a cross-sectional mortality study of deaths occurring among 17 PVC fabricators during the years 1964 to 1973. Relative risk estimates were derived and tested using the Mantel-Haenszel procedure. Although no statistically significant relative risks were found, a least significant relative risk analysis indicated that the underlying relative risk would have to be on the order of three to one in order to be detected. There does seem to be reasonable assurance that very large increases in risk for breast cancer do not exist among these PVC fabricators.