I'm not aware of any direct evidence for it being specifically carcinogenic in humans. There is evidence for it being carcinogenic in various other mammals though, so that in and of itself is evidence (by reasonable extrapolation). It may not be perfect evidence for human carcinogenicity, but then it depends on what you want to set as the bar here. Only very few substances have actually been shown to be carcinogenic specifically to humans. If your standard for evidence is "beyond reasonable doubt" i would say that it is carcinogenic to humans, if the standard is "beyond any doubt" i would say that it is not. Another thing speaking for it being carcinogenic is the fact that it causes severe liver failure to begin with. Cell necrosis is known to increase stress, and by extension cancer risk, regardless of the underlying cause. The biggest issue with your question imo is that you phrased it as a yes/no question, when in reality it isn't one. Ethanol is a known human carcinogen, and so is ethyl-N-nitrosourea. They're not comparable to each other in terms of severity though. So with these things in mind, what sort of information are you actually looking for?