I don't have a tumor. That "henry gale" does.

I dont think there is any super immune system. I think that the island is naturally less toxic ( biologically speaking). as compared to NY where the sewers and streets and people create so much waste and new bacteria/germs.

The island is almost pristine. Maybe becuase of the EM field around it or whats benieth the surface. And theres also a sense of supperiority/shadiness about the others.. and that could be becuase of their faulty immune system. Personally, if my system turns on its self. then my body knows i was up to something BAD. ( think hangovers)

so Sabine and the other OTHERS were obviously up to something bad. maybe like 4 toed mutant offspring or something.