- Arm I: Patients undergo induction comprising interleukin-2 (IL-2) via perilymphatic injections to the ipsilateral myelohyoid muscle and insertion of the sternocleidomastoid muscle on days 1-5 and 8-12. Within 10 days after the last IL-2 injection, patients undergo en bloc resection of the primary tumor and corresponding lymphatic drainage area and pre-study margins. Beginning within 4 weeks after surgery, patients with T2, N0-3 disease but with pathohistological evidence of node invasion or capsular rupture of node metastasis or T3-4, N0-3 disease undergo adjuvant radiotherapy 5 days a week for 4.5-6.5 weeks. Beginning within 4 weeks after surgery or radiotherapy (if applicable), patients receive adjuvant IL-2 via perilymphatic injections to the contralateral myelohyoid muscle and insertion of the sternocleidomastoid muscle on days 1-5. Adjuvant IL-2 continues monthly for at least 1 year in the absence of disease progression.