Figure 1

Scatter plot of physicians estimation of the lifetime risk of various HNPCC-associated cancer types. The physicians generally underestimated the risk of the common types of HNPCC-associated cancers; with 56% underestimating the risk of colorectal cancer and 77% of endometrial cancer. Ovarian cancer was underestimated by 29% and overestimated by 25%. The risks of rare tumor types were, on the other hand, generally overestimated; by 41% for upper tract urothelial cancer and 47% for gastric cancer. For visual purpose, independent random errors, drawn from a uniform distribution on a circle with centre (0,0), have been added to the responses.