My post was not for or against. It is pointing out that one needs to fully educate themselves. The devil is in the details.
For example, in the study "Rat Carcinogenity..." linked by StarScream, the opening sentence says "GW501516, a non-genotoxic PPARδ agonist, was assessed for carcinogenic potential by daily administration (oral gavage) to Han Wistar rats for a period of 104 weeks. Males were given 0, 5, 15 or 30 mg/kg/day for the first 6 weeks of the study. For the remainder of the study males were given 0, 5, 20 or 40 mg/kg/day"
I care about other users on this board, so much so I do not want people rely on the title of a study alone to come to a conclusion.
For reference, 104 weeks is almost 2 consecutive years at a dosage that ranged from 450 mg/day to 3600 mg/day for a 200 lb adult male. That is a minimum of 10x the dosage humans on this forum normally take, for almost 9x the length of time (assuming a 12 week cycle).
I would take the exact same "educate yourself" stance if the alternate were true (Article title of "Cardarine does not cause cancer" and the details stated "rats were studied for 104 minutes, using 0.5 nanograms/kg/day"). If that were the study, I'd say "104 minutes is a short period of time for cancer detection and the dosage is lower than what people propose taking at 0.00045 to 0.0036 mg for a 200 lb male".
Additional truth-in-posting and full transparency:
The particular rats used are known for maintaining a lower body weight and size, which saves on study costs.
They are known to be less prone to cancer.