Let’s look to the research.
This excerpt is taken direct from:
American Association for Cancer Research (2009, April 22). Charred Meat May Increase Risk Of Pancreatic Cancer. ScienceDaily. Retrieved September 26, 2010, from http://www.sciencedaily.com /releases/2009/04/090421154327.htm
“Over the course of nine years, researchers identified 208 cases of pancreatic cancer. Preferences for high temperature cooked meat were generally linked with an increased risk; subjects who preferred very well done steak were almost 60 percent as likely to get pancreatic cancer as compared to those who ate steak less well done or did not eat steak. When overall consumption and doneness preferences were used to estimate the meat-derived carcinogen intake for subjects, those with highest intake had 70 percent higher risk than those with the lowest intake.”
Another article drawing a similar conclusion (this time pertaining to prostate cancer) is available here.
Long story short – don’t overcook your meat.