Cetuximab plus cisplatin-radiation , versus cisplatin-radiation alone , resulted in more frequent interruptions in radiation therapy ( @ % v. @ % , respectively ) ; similar cisplatin delivery ( mean , @ mg/m@ v. @ mg/m@ , respectively ) ; and more grade @ to @ radiation mucositis ( @ % v. @ % , respectively ) , rash , fatigue , anorexia , and hypokalemia , but not more late toxicity .