Optimized 2D-RT for Prostate Cancer

Study Overview
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Brief Summary
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Prostate cancer (CAP) is one of the most common malignancies in men, both in Western countries and developing countries. Radiation therapy (RT) is an important therapeutic option. New technologies (3D, IMRT, IGRT, VMAT) have been introduced in the last decades, with a progressive improvement of clinical outcome. However, in many countries the only treatment option is the traditional 2D technique based on standard simulation. The indications for field definition in this treatment are still based on expert's opinions. The aim of this analysis is to propose new indications for 2D fields definition based on three-dimensional simulation in a population of patients with CAP. Twenty patients with CAP consecutively treated with RT in our center were identified. Patients underwent CT-simulation in supine position. Pelvic MRI images were fused with CT-simulation images. In this way, delineation of the prostate and seminal vesicles was performed on MRI images. Clinical Target Volume definition (CTV) was performed according to EORTC guidelines simulating 4 different categories: low-risk CAP, intermediate-risk CAP, high-risk CAP without involvement of the seminal vesicles, and high-risk CAP with involvement of seminal vesicles. The Planning Target Volume (PTV) was defined by adding a margin of 10 mm to the CTV in all directions. For each patient, 8 treatment plans were calculated. In particular, for each of the 4 categories of risk, 2 treatment plans were calculated by using a cobalt source or 10 MV photons. Treatment plans were calculated using the box technique. Progressive optimization was realized with an iterative procedure by evaluating the three-dimensional dose distribution. Once the final plan was achieved (respecting the PTV constraint: D98 > 95%), distances of the fields edges from a set of reference points were measured.

Official Title
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Definition of Fields Margins for Optimized 2D Radiotherapy of Prostate Carcinoma

Conditions
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Prostate Cancer

Intervention / Treatment
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* Radiation: 2D radiotherapy


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: > 18 years clinical T stage: cT2b, cT2c, cT3a, cT3b informed consent MRI of the pelvis Exclusion Criteria: > 79 years prior surgery treatment for prostate cancer prior pelvic radiotherapy genetic syndromes of hyper-radio-sensitivity chronic infiammatory bowel disease

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 79 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 2D radiotherapy<br>Patients with prostate cancer were treated with 2D-radiotherapy | Radiation: 2D radiotherapy<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| new indications for 2D fields definition | Twenty patients with prostate cancer (CAP) were identified. Pelvic MRI images were fused with CT-simulation images to delineate prostate and seminal vesicles on MRI images. Clinical Target Volume definition (CTV) was performed according to EORTC guidelines simulating 4 different categories: low-risk CAP, intermediate-risk CAP, high-risk CAP with or without involvement of the seminal vesicles. The Planning Target Volume (PTV) was defined by adding a margin of 10 mm to the CTV. For each patient, 8 treatment plans were calculated using box tecnhique: 2 treatment plans for each risk category were calculated by using a cobalt source or 10 MV photons. Progressive optimization was realized with an iterative procedure by evaluating the three-dimensional dose distribution. Once the final plan was achieved (respecting the PTV constraint: D98 > 95%), distances of the fields edges from a set of reference points were measured. | through study completion, up to 10 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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2D, prostate neoplasms, radiotherapy, simulation