Quantitative pretreatment CT volumetry: Association with oncologic outcomes in patients with T4a squamous carcinoma of the larynx.

Abstract

The purpose of this study was to determine the impact of CT-determined pretreatment primary tumor volume on survival and disease control in T4a laryngeal squamous cell carcinoma (SCC). We retrospectively reviewed 124 patients with T4a laryngeal cancer from 2000-2011. Tumor volume measurements were collected and correlated with outcomes. Five-year overall survival (OS) for patients with tumor volume ≥21 cm³ treated with larynx preservation (n = 26 of 41) was significantly inferior compared to <21 cm³ (42% vs 64%, respectively; P = .003). Five-year OS for patients with tumor volumes ≥21 cm³ in the cohort treated with total laryngectomy followed by radiotherapy (RT; n = 42 of 83) was not statistically significant when compared to <21 cm³ (50% vs 63%, respectively; P = .058). On multivariate analysis, tumor volume ≥21 cm³ was a significant independent correlate of worse disease-specific survival (DSS; P = .004), event-free survival (P = .005), recurrence-free survival (RFS; P = .04), noncancer cause-specific survival (P = .02), and OS (P = .0002). Pretreatment CT-based tumor volume is an independent prognostic factor of outcomes in T4a laryngeal cancer.