Vol 26, No 6 (2021)
Research paper
Published online: 2021-09-29

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Evaluation of the rectal V30 parameter in patients diagnosed with postoperative endometrial cancer

Magdalena Łukowiak12, Grzegorz Galant3, Karolina Jezierska4, Michał Falco2, Piotr Woźniak21, Wojciech Podraza4, Janusz P. Kowalski-Stankiewicz3
Rep Pract Oncol Radiother 2021;26(6):899-905.

Abstract

Background: The present paper reports on analysis of 184 patients who were diagnosed with endometrial cancer. The main objective of this study was to address parameter Vrec(30Gy) which determines a volume of the rectum irradiated with a dose of 30 Gy during radiotherapy.

Materials and methods: All patients were irradiated with an IMRT technique on linear accelerators. The planning target volume (PTV) contour was determined by a radiation oncologist. The clinical target volume (CTV) was drawn on CT images obtained in a prone position. For statistical analysis, appropriate tests (e.g. the Shapiro-Wilk, Wilcoxon) were used.

Results and discussion: The performed analysis showed that the recommended condition for Vrec(30Gy) is met only in 3% of patients and the observed median value exceeds 90%. The obtained results were compared with the studies in which the Vrec(30Gy) values were related to various radiotherapy techniques.

Conclusions: The analysis showed that the condition for Vrec(30Gy) is satisfied in the case of only 3% of patients. Due to the difficulty with meeting the condition, it should be reconsidered based on real results. 

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