Twice-a-day radiotherapy for head and neck cancer: the Catalan Institute of Oncology experience.

Purpose: The purpose of this work is to evaluate the contribution of hyperfractionated radiotherapy (RT) in head and neck cancer by sub-localisation.

Patients And Methods: From 1992 to 1999, 318 patients with squamous head and neck tumours treated by hyperfraction RT were analysed according to their sub-localisation and stage. Fractions used were 1.2 Gy twice-a-day with a curative intent on all patients, to a total mean dose of 79.14 Gy. Treatment protocols by localisation were: larynx: 55 patients with T2N0 and T1-2N1 tumours treated with only RT and 27 patients with T3N0-1 in complete remission after three cycles of induction chemotherapy (ICT); hypopharynx: 29 patients with T2-4N0-2b resectable tumors in response to three cycles of ICT; oropharynx: 48 patients with T2-3N0-1 and T1N1 tumours treated with only RT; 34 patients with nasopharynx tumours treated with RT and three cycles of ICT if T4 or >N1; finally, 125 patients with non-surgical tumours of any localisation treated with four cycles of induction CT and RT.

Results: LARYNX: Actuarial local control (LC), disease-free survival (DFS) and overall survival (OS) at 5 years were 78, 73 and 48%, respectively, in T2 tumours and 75, 72 and 60% in stage III disease. HYPOPHARYNX: Actuarial LC, DFS and OS at 4 years were 44, 39 and 35%, respectively. OROPHARYNX: Actuarial LC, DFS and OS at 5 years were 52, 44 and 31%, respectively. NASOPHARYNX: Actuarial LC, DFS and OS at 5 years were 78, 72 and 78%, respectively. NON-SURGICAL TUMORS: Actuarial LC, DFS and OS at 5 years were 39, 33 and 19%, respectively. A total of 47 patients (14.8%) of the overall group had a second tumour, 72% of them tobacco-related. Only patients with nasopharynx tumours had a low incidence of second tumours.

Conclusions: Twice-a-day external RT can be effectively managed in patients with head and neck cancer. Second neoplasm and intercurrent diseases become an important problem in low and medium stages whereas disease recurrences is the main problem in advanced stages. Results by localisation permit to obtain conclusions about their indications in each one.