Nodal Radiation Therapy for Sentinel Lymph Node Positive Melanoma

This phase II trial seeks to determine the role of nodal radiation therapy after sentinel lymph node biopsy (SLNB) for patients with high risk sentinel lymph node positive melanoma who are planned for immunotherapy without completion lymph node dissection. Prior studies of patients with more advanced melanoma have shown nodal radiation therapy can decrease the risk of nodal recurrence but it is not known if this same benefit will be seen in patients with high risk sentinel lymph node positive disease who are planned for immunotherapy.