Well, I'm going to stir the pot here.
He did not receive a Nobel Prize for cancer research.
He received a Nobel Prize for cell respiration.
In 1926 he was up for a Nobel Prize with some other scientist for their theory on tumor cells and oxygen deficiency; but the Nobel Prize went to the other guy for the similar research.
He later learned that this was not a factor.
Cancer has been found in alkaline and acidic systems, though it grows and spreads faster in acidic systems.
A little research goes a long way, seriously, I went to https://www.nobelprize.org/ and did a simple search. Easy-peazy.