What is the preferred agent for metastatic male breast cancer patient who progresses on tamoxifen and is not a candidate for chemotherapy?

This is luckily not a common scenario. Metastatic breast cancer in men is quite unusual in a typical practice, primarily because the disease is rare to begin with and we would most often see men with non-metastatic disease.

Of course, the majority of breast cancers in men are ER-positive, more than w...