"The UFC and MMA in general is a steroid epidemic. They've started this really stringent testing and everybody is getting popped. They're just getting popped left and right. It's one of the things fighters have been saying for a long time, that everyone is on steroids, a huge percentage. Give a number 50, 60 [percent]. Whatever the fuck it is that are on steroids. The reality is, this whole steroid epidemic, one thing we have to recognize, the use of steroids is less than 100 years old. There's always been substances that people have taken, but the actual use of anabolic steroids in human beings is relatively recent in human history. I think as time goes on, they're going to create more powerful and crazier shit and it's going to get to the point where you're going to test negative because you're not on it anymore but your body will forever be changed."
Although it is a popular belief that steroids can give you cancer, this is actually a very rare phenomenon. Since anabolic/androgenic steroids are synthetic versions of a natural hormone that your body can metabolize quite easily, they usually place a very low level of stress on the organs. In fact, many steroidal compounds are safe to administer to individuals with a diagnosed liver condition, with little adverse effect. The only real exception to this is with the use of C17 alpha alkylated compounds, which, due to their chemical alteration, are somewhat liver toxic. In a small number of cases (primarily with Anadrol 50®) this toxicity has lead to severe liver damage and subsequently cancer. But we are speaking of a statistically insignificant number in the face millions of athletes who use steroids. These cases also tended to be very ill patients, not athletes, who were using extremely large dosages for prolonged periods of time. Steroid opponents will sometimes point out the additional possibility of developing Wilms Tumor from steroid abuse, which is a very serious form of kidney cancer. Such cases are so rare however, that no direct link between anabolic/androgenic steroid use and this disease has been conclusively established. Provided the athlete is not overly abusing methylated oral substances, and is visiting a doctor during heavier cycles, cancer should not be much of a concern.