"Mutations are the engine of evolution. Without them we never would have evolved." Please keep the state religion out of scientific discussions. Yes, DNA replication results in mutations. If these documented mutations really were 100,000,000's of years old, we would not be here: we would have mutated outselves out of existence. Yes, EVERY mutations is harmful. The state religion has no way of showing where a mutations could be beneficial, so much less is there any evidence (the stuff of real science) that it happened. Thus, cancer is incurable because we won't stop throwing carcinogens around our environment for others' bodies to not be able to deal with. There's no "good" to this one; worse, we're doing it to ourselves.