What dose would you use to treat an unresectable axillary breast cancer recurrence in a patient who has not previously received radiation therapy?  

I usually treat GTV node  between 60-66 Gy based on volume of disease at the time of treatment ( some get upfront systemic treatment to downsize and make disease resectable and final dose is based on residual disease size )

I usually take the nodes if unresectable to 60-66 Gy as well, respecting brachial plexus tolerance.  if a candidate for chemotherapy we try to downsize the disease and often we try concurrent chemotherapy as a radiation sensitzer.