The relation of CT-determined tumor parameters and local and regional outcome of tonsillar cancer after definitive radiation treatment

Int J Radiat Oncol Biol Phys. 2001 May 1;50(1):37-45. doi: 10.1016/s0360-3016(00)01559-5.

Abstract

Purpose: To investigate the value of CT-derived tumor parameters as predictor of local and regional outcome of tonsillar squamous cell carcinoma treated by definitive radiation therapy.

Methods and materials: The pretreatment CT studies of 112 patients with tonsillar squamous cell carcinoma were reviewed. After redigitizing the films, primary and nodal tumor volume was calculated with the summation-of-areas technique. The nodal CT aspect was graded using a 3-point scale (homogenous, inhomogeneous, and necrotic). Mean follow-up time was 33 months. Actuarial statistical analysis of local and regional outcome was done for each of the covariates; multivariate analysis was performed using Cox's proportional hazards model.

Results: In the actuarial analysis, CT-determined primary tumor volume was significantly correlated with local recurrence rate (p < 0.05) when all patients were considered, but primary tumor volume did not predict local control within the T2, T3, and T4 category. CT-determined nodal volume was significantly related to regional outcome (p < 0.01), but nodal density was not. Total tumor volume was not significantly related to locoregional outcome (p = 0.1). In the multivariate analysis, the T and N categories were the independent predictors of local and regional outcomes, respectively.

Conclusion: Compared to other head-and-neck sites, primary and nodal tumor volume have only marginal predictive value regarding local and regional outcome after radiation therapy in tonsillar cancer.

Publication types

  • Clinical Trial

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Carcinoma, Squamous Cell / pathology*
  • Carcinoma, Squamous Cell / radiotherapy*
  • Female
  • Follow-Up Studies
  • Humans
  • Lymph Nodes / pathology
  • Lymphatic Metastasis
  • Male
  • Middle Aged
  • Multivariate Analysis
  • Neoplasm Staging
  • Predictive Value of Tests
  • Proportional Hazards Models
  • Retrospective Studies
  • Survival Rate
  • Tomography, X-Ray Computed
  • Tonsillar Neoplasms / pathology*
  • Tonsillar Neoplasms / radiotherapy*
  • Treatment Outcome