Of course they would but say that out loud. That **** is absurd. You can't say in real life and in the same sentence have travel to a magical realm be taken serious.
People with cancer and ppl who have fam that have died from it would be quick to be offended.
You are right but it's a fictional verse. So logically speaking, why isn't cancer more treatable in the Marvel verse? And from an in-universe standpoint, why haven't Jane Foster or Foggy Nelson elected to treat their illness in a manner that is consistent with their universe?
Marvel is suppose to be the world outside your window just with fictional superheroes and super villains. However, when a writer wants to write a more grounded story it'll be more like the real world and less like a fictional one. It makes more sense to have a story where a superhero has to face something like cancer and can't just beat it in to the ground. If not you'll just have them curing all of the world's problems.
As things stand now though, logically speaking, there is no cure for cancer in the Marvel U and that's either cuz the smartest haven't found it, the smartest are selfish and won't share it or if you use magic to cure it something worse will happen instead. So simply speaking it is consistent with their universe.
You'd have to read the DD book but for Foggy it's almost not an option. I think there's one issue about it. As for Thor, I don't read that book but it seems like Aaron had Jane acknowledge Asgardians have some magical cure and opted to do it on her own. The idea of trying to beat cancer on your own as crazy as that sounds is an option ppl take and a very rare few actually succeed in beating (like in Dallas Buyer's Club or all those ppl that tell you not to take the meds or do chemo). To me though, I'd flip the question. It shouldn't be why hasn't Jane or Foggy elected to get the cure from heroes they know that have it but why hasn't somebody like Thor just gave the cure to the whole world already?
There's also the chance Jane is actually resigned to her fate, felt she lived a full enough life and wants to die with dignity (peep Mad Men with Betty Draper going that route and ppl actually do this in the real world too) and figures why not be Thor in her last days.
Makes sense, but now you have the conundrum of multiple characters having cancer and all of them refusing the presumably simple and quick treatments that should already exist in an advanced universe like the Marvel Universe
So it's either
Be insensitive to people with cancer
Or make very little logical sense as to why cancer isn't more treatable in an advanced society where magic, faster-than-light spacefaring technology, mutants, gods, aliens, and Reed Richards exist
For the longest Marvel has gone with the latter option.
As it stands in the Marvel universe there isn't even one specific cure for cancer not to get in to different types you can get. The original Captain Marvel died from cancer, other alien cultures called it the black death. His whole death story was about how nobody has a cure for cancer.
Reed Richards technically hasn't found a 100% sure fire cure for it either with all his genius. Their mailman Willie Lumpkin got a specific kind of cancer and they shrunk themselves down and killed the cancer cells, stopped it from metastasizing just so he could live longer. It didn't cure his cancer though and didn't stop the possibility of it coming back.
In Wakanda, they have some cure for cancer but refused to share it with the rest of the world due to politics. Dr. Doom I think came up with his own cure for cancer or stole Wakanda's and turned that cure in to a bio-weapon, so now if the cure gets out it's some virus that's worse than what it's curing
The ppl running these comics know they shouldn't be getting that detailed and specific with real world problems like this. If they did their world would either be much worse or a utopia. There wouldn't be all this famine and homelessness in parts of Africa and the Middle east but all the wars would be much worse cuz ppl would have all types of advanced tech and super powers. To compare to the real world though, you know there are conspiracy theorists that say there's already a cure for cancer and the elite simply won't share it.
I think Marvel pretty much learned their lesson when they said being a mutant meant you were immune to HIV and AIDs. Then shortly after they came up with the Legacy Virus story which only kills mutants.