>>513764965 (OP)
Short answer, No. It's your own cells going rogue, being ordered to die, refusing (or being unable to comply) and turning your critical organs into lumps of undifferentiated flesh.
If the organs can be removed and you can take something to substitute for the loss, then you can survive.
If there are backups (like bone marrow in other areas) then the affected parts can be irradiated and hopefully grow back without the error.
If you get cancer in irreplaceable parts like the esophagus, you're fucked. There's literally no point in putting yourself through chemo and radiation under those circumstances. You feel like a trash bag on the curb three weeks into a summer garbage strike on that shit. Only worth doing if there is a good chance of remission (like leukemia, 70-80%)