title: Cancer of the head and neck. Nasopharyngeal cancer. Megavoltage advances vs the orthovoltage era.
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000532:radiotherapy*; D006801:Humans; D008207:Lymphatic Metastasis / Q000532:radiotherapy; D009303:Nasopharyngeal Neoplasms / Q000532:radiotherapy*; D011832:Radiation Injuries / Q000517:prevention & control; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy; D012737:Sex Factors