Question

Cancer treatment is extremely difficult to treat because

A) of the lack of availability of primary stem cells
B) cancer cells become mutated because they live a long time in the body
C) it is often a genetic disease
D) very often by the time it is diagnosed it has already metastasized

Answer 1

I would go with very often by the time it is diagnosed it has already metastasized

Because when looking at cancer cases it's really hard to diagnose it when that isn't the reason they come in for. And sometimes in it's starting stages it will be ignored or mistaken for something else.