Prostate Cancer Clinical Trial
Official title:
Multicenter Study of Hypofractionated Postoperative Radiotherapy in Patients Diagnosed With Prostate Carcinoma
The objective of this study is to evaluate, in patients diagnosed with prostate cancer who undergo radical prostatectomy and who require postoperative radiotherapy, tolerance in terms of acute and chronic GU and GI toxicity and efficacy in terms of biochemical control and survival, as well as of quality of life, from a hypofractional external radiotherapy scheme, increasing the dose per fraction in a shorter period of time.
What the investigators present in this study is a hypofractionation scheme of 62.5 Gy in 25
daily fractions of 2.5 Gy / day, which was chosen to provide a biological equivalent dose
(BED) of 166.67 Gy, comparable to the 163 Gy administered with a scheme Normally divided up
to 70 Gy in daily fractions of 2 Gy / day Version 2.0, March 27, 2019
(assuming an α / β ratio of 1.5 Gy for prostate cancer). The BED in risk organs (mainly
rectum and bladder) will be governed by the ratio used and will differ depending on whether
acute or late toxicity is calculated. If selected an acute α / β of 10 Gy and a conservative
α / β for late toxicity of 3 Gy, the standard fractionation will result in an acute BED of 84
Gy versus 78 Gy in the hypofractionation scheme and a BED of 116.67 vs. 114.5 Gy for late
toxicity.
Therefore, what the investigators expect is a toxicity profile that is at least similar, if
not slightly better, compared to the norm-fractionated scheme of 70 Gy in 35 fractions and
similar rates of biochemical control and survival.
To all this is added the use of intensity modulated radiotherapy and image-guided
radiotherapy techniques (IGRT) that will allow the investigators to significantly reduce the
dose administered to risk organs.
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