Development of quantitative exposure data for a pooled exposure-response analysis of 10 silica cohorts.

Background: Comprehensive quantitative silica exposure estimates over time, measured in the same units across a number of cohorts, would make possible a pooled exposure-response analysis for lung cancer. Such an analysis would help clarify the continuing controversy regarding whether silica causes lung cancer.

Methods: Existing quantitative exposure data for 10 silica-exposed cohorts were retrieved from the original investigators.

Brain tumors and salivary gland cancers among cellular telephone users.

Background: Possible risk of cancer associated with use of cellular telephones has lately been a subject of public debate.

Methods: We conducted a register-based, case-control study on cellular phone use and cancer. The study subjects were all cases of brain tumor (N = 398) and salivary gland cancer (N = 34) diagnosed in Finland in 1996, with five controls per case.