and liver tumors have been known to appear in people not taking anabolic steroids. that they rarely appear in people taking non 17aa orals doesn't mean steroids were the cause. Correlation != Causation, etc, etc.
Sure, but the same can be said for liver tumors appearing in people who
were taking 17aa orals. Correlation != Causation, etc, etc.
It's often said that Anadrol is the only steroid that has been "proven" to be able to cause liver cancer/tumors - however, I would say they can be caused by other 17aa orals as well. I also think it's quite possible injectable steroids can cause them too. Some estrogen metabolites especially can inhibit bile flow, the liver contains androgen receptors etc, etc.
The liver tumor warning is in every anabolic steroid PDR entry. Injectable, oral, 17aa or not.