Purpose: To discover possible risk factors for local-regional recurrence (LRR) following preoperative radiation therapy and curative surgery for head and neck squamous cell carcinoma (SCC) (stage II-IVB).
Materials and methods: Clinical records from 1987 to 1999 of 161 patients with head and neck SCC (oral cavity, 80 patients; larynx, 50; hypopharynx, 19; oropharynx, 12) who underwent preoperative radiation therapy and surgery were retrospectively reviewed. One hundred thirty-two (82%) of the patients had stage III or IV cancer. The median radiation dose was 38 Gy.
Results: The 5-year overall survival rate and LRR rate were 58% and 35%, respectively. At multivariate analysis, oral cavity cancer (P =.020), clinical T stage (P =.016), clinical N stage (P =.017), and status of surgical margins (P =.008) emerged as variables that were significantly associated with LRR. The analysis of only those patients with lymph node involvement showed that oral cavity cancer (P =.008), advanced N-stage cancer (P =.045), and long interval between the start of preoperative radiation therapy and surgery (> or =7 weeks) (P =.019) emerged as variables that were significantly associated with LRR.
Conclusion: Oral cavity cancer, advanced T or N stage of disease, and unsatisfactory margins were risk factors for LRR. A long interval (> or =7 weeks) was a risk factor for LRR in patients with lymph node involvement.