Dose Escalation to Dominant Intraprostatic Lesions (DIL) With MRI-TRUS Fusion High Dose Rate (HDR) Prostate Brachytherapy (BRAPROST)
Phase II Study of Dose Escalation to Dominant Intraprostatic Lesions (DIL) With MRI-TRUS Fusion Real Time High Dose Rate (HDR) Brachytherapy in Patients With Intermediate and High Risk Prostate Cancer
The Magnetic Resonance (MR) provides high resolution of soft tissue images allowing an appropriate assessment of the local extent of the disease. Recent studies have shown an increase in sensitivity and specificity for the detection of Dominant intraprostatic lesions when using multiparametric MRI as a diagnostic tool in the staging of the disease.
Among the various irradiation techniques currently available for prostate cancer, Brachytherapy is the superior in terms of dose conformation; this conformation allows greater dose escalation, adjusting the isodoses to the prostate with exquisite accuracy, keeping healthy adjacent organs, such as the urethra and rectum, in a tolerable dose range
Brachytherapy companies have recently developed software allowing for TRUS-MR image fusion.
The purpose of this study is to demonstrate the feasibility of the delivery of a higher than prescription dose to the dominant intra-prostatic nodule as defined on multiparametric MRI.
Dose to prostate, and adjacent structure will remain the same as the current treatment practice. Timing and the delivery of brachytherapy will not change from our current practice
Descripción general del estudio
Estado
Condiciones
Intervención / Tratamiento
Descripción detallada
Treatment:
The patient's treatment will consist of combined Hypofractionated external beam (3750 cGray in 15 fractions) and MRI-TRUS fusion HDR brachytherapy boost (1 fraction of 1500 cGray.
Brachytherapy performed under general anesthesia as an outpatient procedure
TRUS-MRI fusion:
T2 axial volumetric sequence (VISTA) is imported directly from the picture archiving and communication systems (PACS). Then MR images are reconstructed and segmented. Target volumes (prostate gland, dominant intraprostatic lesions (DILs)and Organs at risk (OARs) urethra and rectum are delineated.
A transrectal sagittal volumetric ultrasound image is immediately adquired every 2 degrees, a rapid reconstruction algorithm converts the series of 2D images into a 3D volume, which is then displayed in axial, sagittal and coronal views and transferred to the module of fusion with the MRI.
The MRI images and the real-time sonography examination are displayed on a split-screen with the possibility of overlaying the images live in one image. A graphical user interface is used for rigid manual registration of the ultrasound and MRI volumes. This interface allows for displacements in the three dimensions and rotations, until both images are correctly superimposed.
Then the contoured structures are transferred to the US dataset, and these contours are slightly modified until a perfect matching with the US images is achieved.
Dose prescription:
The homogeneity parameters used for optimization aim for prostate V100 > 98%, V150 of 25-33%, V200 < 8%, where Vn is the fractional volume of the organ that receives n% of the prescribed dose, urethral dmax < 115% and rectal 1cc < 70% of prescribed dose.
The treatment plan will be manipulated such that the normally occurring high dose regions (125%, 150%) are positioned at the site of the identified disease
Endpoints Feasibility of higher doses administration, toxicity and efficacy will be measured
Tipo de estudio
Inscripción (Anticipado)
Fase
- Fase 2
Contactos y Ubicaciones
Ubicaciones de estudio
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Bizkaia
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Barakaldo, Bizkaia, España, 48903
- Reclutamiento
- Hospital Universitario Cruces
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Criterios de participación
Criterio de elegibilidad
Edades elegibles para estudiar
Acepta Voluntarios Saludables
Géneros elegibles para el estudio
Descripción
Inclusion Criteria:
- Men ≥18 years
- Histologically proven adenocarcinoma of the prostate
- Intermediate or high risk prostate cancer
Intermediate risk prostate cancer patients must have:
Clinical stage ≤ T2c, Gleason score = 7 and iPSA ≤ 20, or Gleason score ≤ 6 and iPSA > 10 and ≤ 20. High risk patients may have Clinical stage T3 Gleason score 8-10 PSA > 20 ng/ml
- A palpable nodule or a cluster of positive biopsies from a single region suggesting the presence of dominant nodule and with radiologic correlation by MRI.
- Estimated life expectancy of at least 10 years.
- ECOG performance status of 0 - 2.
- Signature of informed conseny
Exclusion Criteria:
- Contraindications to interstitial prostate brachytherapy.
- If on coumadin therapy and NOT able to stop safely for 7 days.
- Does not have a localized high volume of intraprostatic disease and MRI contraindicated
- Unfit for general anesthetic
Plan de estudios
¿Cómo está diseñado el estudio?
Detalles de diseño
- Propósito principal: Tratamiento
- Asignación: N / A
- Modelo Intervencionista: Asignación de un solo grupo
- Enmascaramiento: Ninguno (etiqueta abierta)
Armas e Intervenciones
Grupo de participantes/brazo |
Intervención / Tratamiento |
|---|---|
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Experimental: MRI-TRUS fusion guided real time HDR
Patients treated with dose escalation to Dominant Intraprostatic Lesions
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Otros nombres:
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¿Qué mide el estudio?
Medidas de resultado primarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
|---|---|---|
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Feasibility of delivery higher than prescription doses (at least 125% of the dose)using inverse planned MRI-TRUS fusion high dose rate (HDR) brachytherapy.
Periodo de tiempo: 12 months
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Use the multiparametric MRI to identify dominant intraprostatic lesions (DIL) and deliver higher doses to these lesions with real time HDR brachytherapy.
The procedure will be considered feasible if DIL is covered by the 125% of prescription dose while respecting tolerance doses of adjacent normal organs
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12 months
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Medidas de resultado secundarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
|---|---|---|
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Acute toxicity and tolerability compared to the historic cohort of patients treated with standard HDR brachytherapy
Periodo de tiempo: 24 months
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Data to be collected: urinary retention rate, International Prostate Symptom Score over time, rectal toxicity and genitourinary toxicity
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24 months
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Efficacy assessed by PSA, Multiparametric MRI and prostate biopsy
Periodo de tiempo: 30 months
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Patients will be followed with PSA at every follow-up; Multiparametric MRI: at 12 months and 30 months; and TRUS guided biopsy: at 30 months
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30 months
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Colaboradores e Investigadores
Patrocinador
Colaboradores
Investigadores
- Investigador principal: Alfonso Gomez-Iturriaga, MD, Hospital Universitario Cruces
Fechas de registro del estudio
Fechas importantes del estudio
Inicio del estudio
Finalización primaria (Anticipado)
Finalización del estudio (Anticipado)
Fechas de registro del estudio
Enviado por primera vez
Primero enviado que cumplió con los criterios de control de calidad
Publicado por primera vez (Estimar)
Actualizaciones de registros de estudio
Última actualización publicada (Estimar)
Última actualización enviada que cumplió con los criterios de control de calidad
Última verificación
Más información
Términos relacionados con este estudio
Palabras clave
Términos MeSH relevantes adicionales
Otros números de identificación del estudio
- BRAPROST
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