For 13 years, Diane Kraus has parried her disease’s every blow with rounds of radiation and chemotherapy, some of them ineffective, all of them with a cost — nausea, confusion, vertigo, pain — which she also parried with more drugs. “I want to live,” said Kraus, who was diagnosed in 2011 with metastatic breast cancer. “I want to be around. There is fun to be had and people to see.”