Truth Seeker
Adventurer
Tabula Rasa
Sylar starts to find his true identity. Peter and HRG go on a quest to find someone that can save Hiro.
When will people learn, Sylar is evil by choice and by nature, he is not fixable. Sure he MAY have moments of not being evil but his role is of a villian!
So, anyone dig the explanation that Claire's blood can't cure Hiro because a tumor is living tissue? So, Claire can get cancer and nothing could stop it from spreading throughout her body? I'm no oncologist, but doesn't a normal person's immune system try to fight malignant growths?
Sometimes, but not often. The problem with cancer cells is that they're still recognized as self... they just grow too much.
Also, I didn't dig the explanation. Another deus ex machina. Moreover, it makes no sense, since Claire's power has repeatedly worked on living tissue. Examples include resistance to fire (skin), resistance to alcohol (liver), and resistance to drugs (all cells, but primarily neurons). Hell, regeneration (presumably accelerated cell growth) could be considered working on living cells.
You could fanwank it that Claire's cells will heal themselves of the DNA damage required to produce cancer. It would mesh with Adam not getting cancer over so many years. You could also fanwank that Claire's power keys off of accelerated growth, and cancer is essentially cells growing that shouldn't. It still wouldn't make sense though.
If I recall, cancer is more about some part of the person's DNA being activated and not shutting off like it's supposed to when whatever "needed" to happen is finished. If the effect is not able to start in the first place, then she's not at risk.