Is pathological T4a an independent indication of adjuvant therapy in buccal mucosal or gingival squamous cell carcinoma?

Tzu-Yuan Chao, Leong-Perng Chan, Hsin-Hua Lee, Yu-Hsun Kao, Ying-Pei Jhong, Chen-Han Chiang, Shu-Ting Chuang, Chih-Jen Huang