Effect of treatment position and radiotherapy planning on testicular dose in patients with rectal carcinoma

Effect of treatment position and radiotherapy planning on testicular dose in patients with rectal carcinoma

The aim of this study was to evaluate and compare the effect of radiotherapy on testicles with different treatment positions and plans for rectal cancer patients. Mono-institutional prospective study. Three different plans; supine 4-fields (s4f), prone 4-fields (p4f), and prone 3-fields (p3f) of 15...

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Bibliographic Details
Published in:Journal of cancer research and therapeutics Vol. 10; no. 3; pp. 558 - 562
Main Authors: Bakkal, Bekir Hakan, Vural, Tugba, Elmas, Ozlem, Yildiz, Okten, Kokturk, Furuzan
Format: Journal Article
Language:English
Published: India Medknow Publications and Media Pvt. Ltd 01-07-2014
Medknow Publications & Media Pvt. Ltd
Subjects:
Adult
Aged
Care and treatment
Colorectal cancer
Humans
Male
Methods
Middle Aged
Patient outcomes
Patient Positioning
Physiological aspects
Radiation Dosage
Radiotherapy
Radiotherapy Dosage
Radiotherapy Planning, Computer-Assisted
Rectal Neoplasms - radiotherapy
Testis
Testis - radiation effects
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Summary:The aim of this study was to evaluate and compare the effect of radiotherapy on testicles with different treatment positions and plans for rectal cancer patients. Mono-institutional prospective study. Three different plans; supine 4-fields (s4f), prone 4-fields (p4f), and prone 3-fields (p3f) of 15 male patients with rectal carcinoma receiving 45 Gy pelvic radiotherapy were evaluated. Testicular doses in each plan were calculated. Since the localizations of the primary tumor may affect testicular dose, boost doses were not taken into account. Kruskal Wallis test, Pearson and Spearman correlation analysis. Median cumulative testicular doses of s4f, p4f, and p3f plans were 19.8, 69.3, and 100.8 cGy, respectively (P = 0.013). Median V0.5 (Volume receiving more than 0.5 Gy) and V1 (Volume receiving more than 1 Gy) for testicles were also significantly lower in s4f plans (3%, 60.7%, and 78.1% for V0.5 and 0.3%, 35.8%, and 52.3% for V1 in s4f, p4f, and p3f, respectively) (P = 0.001). The median distances between lower edge of fields and testicles in s4f, p4f, and p3f plans were 65 mm, 29 mm, and 29 mm, respectively (P < 0.01). Median bladder doses were significantly lower in p3f plans (P = 0.002). S4f external beam radiotherapy for rectal carcinoma allows better testicular dose than p3f and p4f. The probably reason was the increase of distance between lower edge of the field and testicles.
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ISSN:0973-1482
1998-4138
DOI:10.4103/0973-1482.137943