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Little is known about treatment outcomes for T4 oropharyngeal squamous cell carcinoma (OPSCC), particularly in the era of human papillomavirus (HPV)-related disease.
To evaluate oncologic outcomes for T4 OPSCC treated with primary surgical and nonsurgical therapies.
Design, Setting, and Participants
Retrospective cohort study of 131 patients from a single academic hospital, who were treated for T4a or T4b OPSCC (with any N stage and without distant metastatic disease at presentation) between 1998 and 2012 and had a minimum 2-year follow-up (the median follow-up time was 34.6 months). This study was conducted between January 1, 1998, and November 1, 2012.
Sixty-nine patients underwent nonsurgical therapy, 47 (68%) of whom had p16-positive tumors. Nonsurgical treatment paradigms included induction chemotherapy followed by chemoradiotherapy (n = 36 [54%]), concurrent chemoradiotherapy (n = 29 [43%]), and induction chemotherapy followed by radiation therapy alone (n = 2 [3%]). Sixty-two patients underwent surgical treatment, 50 (81%) of whom had p16-positive tumors. Fifty-seven surgical patients (92%) received adjuvant therapy.
Main Outcomes and Measures
Overall survival (OS) was the primary outcome measure. Secondary outcome measures included disease-specific survival (DSS), disease-free survival (DFS), 2-year gastrostomy and tracheostomy tube rates, and major complication rates.
Significant baseline differences between the surgical vs nonsurgical groups included age (mean 59.8 vs 55.4 years [P = .005]), sex (male, 95% vs 84% [P = .04]), body mass index (<18.5 [calculated as weight in kilograms divided by height in meters squared], 3% vs 16% [P = .02]), and smoking history of 10 or more pack-years (48% vs 77% [P = .003]). For p16-positive patients, Kaplan-Meier estimates of OS, DSS, and DFS were significantly higher for surgically treated patients than for the nonsurgical group (χ21 = 7.335 for log-rank P = .007, χ21 = 8.607 for log-rank P = .003, and χ21 = 7.763 for log-rank P = .005, respectively). For p16-negative patients, Kaplan-Meier estimates of OS and DSS were higher for the surgical group but did not reach statistical significance (χ21 = 2.649 for log-rank P = .10 and χ21 = 2.077 for log-rank P = .15, respectively), while estimates of DFS were significantly higher for patients treated with primary surgery (χ21 = 3.869 for log-rank P = .049. In a multivariable Cox survival analysis, p16-positive immunohistochemical status had a significant positive association with OS (hazard ratio [HR], 0.55; 95% CI, 0.32-0.95 [P = .03]), DSS (HR, 0.45; 95% CI, 0.22-0.92 [P = .03]), and DFS (HR, 0.55; 95% CI, 0.32-0.95 [P = .03]), and nonsurgical treatment had a significant negative association with OS (HR, 2.79; 95% CI, 1.51-5.16 [P = .001]), DSS (HR, 3.38; 95% CI, 1.59-7.16 [P = .002]), and DFS (HR, 2.59; 95% CI, 1.51-4.45 [P = .001]).
Conclusions and Relevance
Primary surgical treatment may be associated with improved outcomes in patients with T4 OPSCC. p16 Immunohistochemical status remains a strong prognostic indicator even in patients with locally advanced disease.
Zenga J, Wilson M, Adkins DR, Gay HA, Haughey BH, Kallogjeri D, Michel LS, Paniello RC, Rich JT, Thorstad WL, Nussenbaum B. Treatment Outcomes for T4 Oropharyngeal Squamous Cell Carcinoma. JAMA Otolaryngol Head Neck Surg. 2015;141(12):1118-1127. doi:10.1001/jamaoto.2015.0764