Supposedly, it's Angelica's own fault she got cancer. In Avengers 12, Hank told Angel that if she wears the suit for six months, then she'll be okay. The explanation they came up with was that Angel stopped wearing the suit before the six months were up and since Pym was kidnapped by the Skrulls at the time, he wasn't able to check up on her. That explanation was flawed on several levels. For one, I can't believe that it was less than six months from Avengers 12 to New Avengers 1. Also, what about Vance? Why didn't he remind her that it wasn't six months yet? And finally, Angelica endangering her health like that is completely out of character.
Michael