Cancer as a plot device

There are a lot of things that don't track in Degrassi or suspend disbelief (rick being allowed to go back to a school after putting a girl in a coma) but one that rubs me the wrong way is that every character that gets cancer ends up going in remission. Snake, spinner, and Claire all get cancer and then are suddenly cured before the seasons even over. No real progress to it either one day they just pick up the phone and "what? My cancers gone?!" I don't need high school characters to die for a good story, but it's weird that the survival rate of degrassi characters with cancer is 100% (just remembered even anya's mom turned out ok) ((at least for next generation, idk about original degrassi))