Document Type : Original Research
Authors
- Marziyeh Mirzaeiyan 1
- Ali Akhavan 2
- Alireza Amouheidari 3
- Atoosa Adibi 4
- Simin Hemati 2
- Mahnaz Etehadtavakol 1
- Hossein Khanahmad 5
- Parvaneh Shokrani 1
1 Department of Medical Physics, Faculty of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
2 Department of Radiotherapy Oncology, Faculty of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
3 Department of Radiation Oncology, Isfahan Milad Hospital, Isfahan, Iran
4 Department of Radiology, Faculty of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
5 Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
Abstract
Background: Modern radiotherapy techniques can destroy tumors with less harm to surrounding normal tissues. Normal Tissue Complication Probability (NTCP) models are useful to evaluate treatment plans.
Objective: This study aimed to use the Quantitative Analysis of Normal Tissue Effects in the Clinic (QUANTEC) program to evaluate dose-volume indicators and radiobiological parameters for complications of the rectum and bladder in prostate cancer patients undergoing pelvic radiotherapy.
Material and Methods: In this prospective cross-sectional study, treatment planning information was gathered from 35 patients with pelvic lymph node involvement. Of these, 17 and 18 were treated using the three-dimensional Conformal Radiotherapy Technique (3D-CRT) and the Helical Tomotherapy (HT) technique, respectively. The Lyman-Kutcher-Burman and Relative Seriality models were used in conjunction with dose-volume histograms to calculate the NTCP values for the rectum and bladder.
Results: In the HT group compared to the 3D-CRT group, the values of D-Mean, V-40, V-50, V-60, and V-65 were lower for both the rectum and bladder. The NTCP values for grade 2 rectal bleeding, proctitis, and bladder toxicity were lower in the HT group. The dose-volume data of 67% of the HT patients satisfied all QUANTEC criteria, while only 30% of the 3D-CRT those met criteria.
Conclusion: The QUANTEC criteria were satisfied for the rectum and bladder in the HT and 3D-CRT groups, except for V-50, V-60, and V-65 of the rectum in 3D-CRT patients. The NTCP values for both organs were lower in the HT group than in the 3D-CRT group.
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