[thatcat]

Since cancer is caused by certain mutations and heat can induce mutation, ingesting hot things can be mutagenic and thus carcinogenic.[0]

Saunas at the right temp for the right time can induce the expression of protective heat shock protiens.[1]

[0]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2773211/

[1]https://www.selfhacked.com/blog/reasons-sweating-far-often/