A strange concept which I came up with after realizing that vampires, werewolves and zombies are basically created by an infection from a virus. This has lead me to brainstorm how I could make a monster formed by an already existing disease. A monster that would be human or animal and possess attributes of the disease they were infected by.
I am aware that this is unlikely in the real world, but I am curious as to how this different origin would affect the monsters. Cancer is a very tempting option because it is naturally occurring in our bodies everyday. This lead to an interesting vampire variant that draws from its cancer properties.
What interests me is the cause and effect of the disease and the resulting monster. What would it look like? How would it work? How does it behave? Wether or not this is possible is not a concern since we already have the X-men that defy biology, so I will not have much competition in realism.