Comparison of the prognostic value of assessing tumor diameter versus tumor volume at diagnosis or in response to initial chemotherapy in rhabdomyosarcoma

Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology
Andrea FerrariLuigi Mariani

Abstract

In this study on a series of 205 patients with rhabdomyosarcoma, we investigated whether the prognostic effect of tumor size, at diagnosis or in terms of tumor response after induction chemotherapy, differed when tumor diameter or tumor volume were considered. Tumor size was assessed radiologically at diagnosis and, for the 108 patients with measurable disease, after three courses of chemotherapy. The analysis was based on multivariable models (linear for association between size and patient/tumor characteristics, Cox for association with survival). The predictive performance of the Cox model (estimated by V measure) was compared for the tumor's diameter and volume. Initial tumor size was significantly larger in male or older patients and in T2 or alveolar tumors, but was not associated with the achievement of complete surgical resection. Initial tumor size significantly influenced overall survival. The risk of death was comparable for tumors 10 cm in maximum diameter and 194.0 cm(3) in volume. The predictive performance of the Cox model was much the same when the tumor's diameter or volume was considered. Tumor response was a significant predictor of survival, again irrespective of the type of tumor measurement considered. In ...Continue Reading

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