I'm sure Lance got the very cadillac of chemo treatments. Maybe not. It definitely depends on what type of chemo a person goes through in terms of how they look afterwards. Some people get weak chemo agents on a daily or 3 times a week treatment schedule. Others get hefty doses jammed into a three day period every couple of weeks. Unfortunately, I got three days of chemo every three weeks. Extreme bouts of nausea and vomiting.
As to the world class athletes and cancer, there's no connection of any kind that I'm aware of. However, there is a strong connection to unhealthy lifestyle and cancer. It does seem that more athletes are going through cancer in the past few decades, but this could be simply a result of media coverage.
Do you know if they tested Lance for RBC levels prior to the race?