- The main purpose of Part A was to examine the safety and the best dosing of panitumumab, chemotherapy and radiation for the treatment of head and neck cancer. The best dosing was determined by increasing doses of chemotherapy given in combination with panitumumab during radiation. The chemotherapy drugs being used in Part A were carboplatin and paclitaxel, which are standard therapies used in head and neck cancer. These drugs were be added to radiation and this combination is called chemoradiotherapy. The investigators have determined the best dose of panitumumab and chemotherapy to give with radiation, Part B has now begun.