If you have access to a breast care nurse @strongtogether, use them as a sounding board. They are there for the whole family. Like some others have said, be wary about Dr Google and prognosis via forums.
The oncology world is quite tightly managed. They take advice from the Clinical Oncology Society of Australia (which, in turn, is informed by local and international studies) about which chemo treatments are recommended for specific cancers. Specific being the key word.
Some oncologists can be bloody horrible people when it comes to bedside manner and can be woefully ignorant about the social and family impacts of treatment. I've sacked three because their attitude made my toxic blood boil. I think, though, that it's safe to say they do follow protocols when to comes to treating the disease, particularly on the first offensive.
Cancer treatment is a moving feast and it has changed considerably since I was first diagnosed. Sometimes you do have to trust the experts to do expert stuff. Which doesn't mean you can't give them a spanking if they don't properly attend to the non clinical details. Mxx