I agree with the concern. I did a few cycles of GW501516 and it certainly was effective for fat loss, but admittedly didn't realize the potential carcinogenic effect until later. It's been several years and I don't have cancer. I do actually have hepatic congestion due to a unique cardiac structure and resultant vascular backpressure. I haven't gotten any full body scan but I have gotten alpha-fetoprotein test for liver cancer, which my Drs always have in the back of their mind due to my weird liver circulation and resulting fibrosis, but my alpha-fetoprotein levels have been very low and not at all suggestive of liver cancer, which incidentally is one of the cancers that seemed to result most frequently from GW501516. For anyone not to be a little concerned about these cancer studies seems insane, but personally I think I took like 3-4 cycles and I don't have cancer.