Do you routinely use PET/CT to monitor response to systemic therapies in metastatic breast cancer?   

This is an interesting question. I think a lot of us use systemic CT or PET-CT scanning at 3-4 month intervals to screen for progression in MBC while someone is on a therapy. Many of us do this even in bone only disease, looking for new metastases in visceral sites. There is a recent JCO publication...