Is there a role for adjuvant systemic therapy (in addition to adjuvant radiation) in an early-stage, resected cutaneous angiosarcoma of the head/neck?

Angiosarcomas have a high rate of local (or distant) recurrence, but with all tumor resected and if there were wide surgical margins then radiation may be sufficient for a small superficial tumor, followed by close surveillance. If there is a recurrence, then our practice is to give neoadjuvant chem...