Primary glomerulonephritis and hydrocarbon exposure: a case-control study and literature review.

A case-control study was undertaken to investigate the possible role of chronic hydrocarbon exposure and tobacco and alcohol consumption in the causation of primary glomerulonephritis. Exposure to hydrocarbons and the consumption of tobacco and alcohol were assessed blindly by telephone interview and questionnaire in 55 patients with end-stage renal disease due to biopsy-proven primary glomerulonephritis in whom there had been no evidence of systemic disease. This was compared with 55 normal subjects matched for age, sex, social class and residential area and a comparable internal control group of 45 patients with end-stage renal disease secondary to systemic disease, diabetic nephropathy or chronic pyelonephritis. Hydrocarbon exposure scores derived from the results of the questionnaires were significantly higher (p < 0.001) in the patients with primary glomerulonephritis than in the normal subjects and the internal control group. Moreover, more detailed assessment of the type of hydrocarbon exposure showed significantly greater exposure of patients with glomerulonephritis to petroleum products (p < 0.001), greasing/degreasing agents (p < 0.01) and paints/glue (p < 0.05), and a resulting estimated relative risk of developing glomerulonephritis with each type of hydrocarbon exposure of 15.5, 5.3 and 2.0. Those patients with heavy hydrocarbon exposure (hydrocarbon score > 25,000) had a significantly higher serum creatinine at presentation than those with mild to moderate exposure, suggestive of more advanced renal disease. However, there was no significant difference in tobacco and alcohol consumption among subjects in different groups. We conclude that occupational exposure to hydrocarbon is likely to play a role in the pathogenesis of primary glomerulonephritis and that the risk of developing glomerulonephritis is greatest in those subjects exposed to petroleum products.