Shell.
Your onc has probably selected Doxil because it is as good as Adryamicin (considered among the top chemo drugs) in terms of response rate & efficacy but with reduced side effects on the heart.
In addition Doxil+Herceptin in phase 2 clinical trial has demonstrated a high response rate approaching 90% (58% regression, 32% stabilization).
However,this combo is not yet approved & it would depend on your onc if he is willing to prescribe it off label.
http://www.ufscc.ufl.edu/patient/can...rnews&id=36962
Herceptin® Plus Doxil® Safe and Effective in Metastatic Breast Cancer