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The Predictive Value of Tumor Size, Volume, and Markers During Radiation Therapy in Patients With Cervical Cancer.

OBJECTIVES: We investigated the prognostic significance of changes in primary tumor volume and serum squamous cell carcinoma antigen (SCC-ag) levels during radiation therapy (RT) in patients with cervical cancer.

METHODS: We conducted a review of 40 patients treated with RT. All patients received external beam RT and intracavitary brachytherapy. The primary tumor volume and squamous cell carcinoma antigen levels were measured pre-RT and mid-RT. Overall survival (OS) and progression free survival (PFS) were estimated, and possible prognostic factors for survival were analyzed.

RESULTS: The correlation coefficient between primary tumor volume reduction rate (pTVRR) and serum squamous cell carcinoma antigen reduction rate in all patients was 0.550 (P < 0.001). In univariate analysis, stage more than II (P <0.001), pre-RT pTV of 55 cm or more (P = 0.05), mid-RT tumor size of 4 cm or more (P = 0.004), and pTVRR of 90% or less (P = 0.031) were significant unfavorable prognostic factors for PFS, whereas stage (P = 0.009) was the only significant prognostic factor for OS. Multivariable analysis revealed that none of these factors were independently associated with PFS or OS.

CONCLUSIONS: There was a significant correlation between pTVRR and squamous cell carcinoma antigen reduction rate. Our findings indicate that the tumor parameters such as pre-RT pTV, mid-RT tumor size, and pTVRR are associated with PFS in women with cervical cancer.

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