Prognostic value of gross tumour volume in laryngeal cancer: a systematic review and meta-analysis.

OBJECTIVES

Gross tumour volume has been proposed as a complementary prognostic marker in laryngeal squamous cell carcinoma. This systematic review and meta-analysis evaluates the prognostic value of pre-treatment gross tumour volume.

METHODS

MEDLINE, Embase and Scopus were systematically searched according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Studies reporting pre-treatment gross tumour volume and survival outcomes in laryngeal cancer were included. The primary outcome was overall survival, and the secondary outcome was disease-free survival. Hazard ratios were pooled using random-effects meta-analysis. Risk of bias was assessed using the Quality in Prognosis Studies tool, and certainty of evidence using the Grading of Recommendations Assessment, Development and Evaluation approach.

RESULTS

Eight retrospective studies including 1351 patients were included. Increasing gross tumour volume was significantly associated with worse overall survival (pooled hazard ratio per 1 cm3 increase: 1.03; 95 per cent confidence interval: 1.02-1.05), with a similar association observed for disease-free survival. Overall risk of bias was moderate.

CONCLUSIONS

Higher gross tumour volume is independently associated with poorer survival in laryngeal cancer and may provide prognostic information beyond tumour-node-metastasis staging.