Screening for colorectal cancer and polyps among pattern makers

Journal of Occupational Medicine. : Official Publication of the Industrial Medical Association
S K HoarA Blair

Abstract

In response to a union request, a cancer screening program was conducted for the Pattern Makers' League of North America. Ten colon cancer cases were detected among the 1,465 white men screened with a flexible sigmoidoscope. The difficulties in obtaining appropriate "expected" numbers were that prevalent detectable preclinical colon cancer is not equivalent to incident disease, and the flexible sigmoidoscope yields results not directly comparable to those of the rigid sigmoidoscope used previously. The "expected" number of cancers was obtained by using an independent estimate of 5 years for the mean duration of the detectable preclinical phase. This implied that the expected number of colon cancer cases should be based on the age-specific incident rates among white men in the next-older 5-year age group and that the annual expected number should be multiplied by five. Therefore, the ten observed cases of colon malignancies represented an approximately threefold increase. For invasive cancer only, there was a slightly less than twofold cancer increase. Fifteen percent of the men had one or more colorectal polyps.

Citations

Jul 1, 1991·American Journal of Public Health·S H ZahmA Blair
Jan 16, 1998·Journal of Occupational and Environmental Medicine·N BeckerB Marschall
Mar 29, 2007·International Journal of Cancer. Journal International Du Cancer·Won Jin LeeMichael C R Alavanja
Jul 1, 1994·American Journal of Industrial Medicine·R Y Demers, K C Parsons
Apr 1, 1994·American Journal of Industrial Medicine·B A MillerE J Reed
Jan 1, 1989·American Journal of Industrial Medicine·S H ZahmJ R Davis
Mar 8, 1990·The New England Journal of Medicine·M R CullenL Rosenstock

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