Why don't family physicians follow clinical practice guidelines for cancer screening? Family Physician Study Group, Sociobehavioral Cancer Research Network, National Cancer Institute of Canada.

Ideally, physicians will adoptguidelines backed by good or fair evidence (grade A or B recommendations respec-tively) and will not waste resources on manoeuvres that are recommended for exclu-sion on the basis of fair or good evidence (grade D or E recommendations respec-tively). But this is not happening. In many cases family physicians do not adhere tocancer screening guidelines backed by good evidence,