The role of post-operative radiation therapy in the treatment of malignant tumors of the parotid gland.

Twenty-nine patients treated with postoperative radiotherapy for malignant tumors of the parotid gland were reviewed at the Joint Center for Radiation Therapy. Most patients were treated between 5,000 and 6,500 rad. All were treated because of microscopic residual disease, extra capsular extension, or tumor close to the facial nerve. The overall results showed one in-field failure, two marginal recurrences, and eight patients failed distantly. Poor prognostic factors included high-grade, extracapsular extension, and nodal involvement. We conclude that patients with malignant tumors of the parotid should be treated with postoperative radiation therapy if any of the bad prognostic signs are present. This may enable the surgeon to spare the facial nerve and obtain local control results equal to or better than more radical surgical procedures.