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Immune Response Evaluation in Oligorecurrent and Oligoprogressive Prostate Cancer Patients Treated With SBRT
Sponsor: Istituto Clinico Humanitas
Summary
At the moment there is a lack of data in the setting of oligometastatic PC in particular regarding the interaction between ablative SBRT, ADT and patient's immune system response. The hypothesis underlying this project consists in the idea that the patient's immunological context, RT and ADT may interact in the context of metastatic PC. Indeed the immune landscape of patients may interfere with the efficacy of SBRT and on the other side RT may modulate the immune response by driving immunotolerance. Scope of the study will be to investigate the immune modulation after SBRT in: * patients with diagnosis of oligorecurrence during a treatment-free interval * patients with oligoprogression or oligopersistance during hormonal therapy
Official title: Pilot Study of Immune Response Evaluation in Oligorecurrent and Oligoprogressive Prostate Cancer Patients Treated With Metastases-directed Stereotactic Body Radiation Therapy (SBRT) With and Without Concomitant Androgen Deprivation Therapy
Key Details
Gender
MALE
Age Range
18 Years - Any
Study Type
INTERVENTIONAL
Enrollment
40
Start Date
2020-10-19
Completion Date
2026-07
Last Updated
2025-04-24
Healthy Volunteers
No
Interventions
Radiotherapy
RT treatment Schedule as for clinical practice: Stereotactic body radiation treatment (SBRT) will be delivered with image guidance (image-guided radiation therapy or IGRT) and in the form of volumetric modulated arc therapy (VMAT). RT treatment Schedule: SBRT will be delivered in 1 to 6 fractions on bone or lymph node metastases. The dose and fractionation schedule will depend on the size and location of the lesion and the surrounding normal tissue constraints.
androgen deprivation therapy (ADT)
ADT as for clinical practice: * for oligorecurrent patients, ADT will be started at time of polimetastatic progression after SBRT; * for oligoprogressive patients, ADT will be continued during SBRT and untill polimetastatic progression
immune evaluation
We will use the flow cytometer FACSymphony, to analyse multiple immune populations from a limited sample of blood. We will monitor the dynamics of most innate (monocytic and granulocytic cells, Natural killer cells) and adaptive (T cells, B cells) immune subsets in the peripheral blood of PC patients before and after RT. We will deeply characterize CD4+ and CD8+ T cell subpopulations circulating in the patients enrolled in the study. In this attempt our panel will include markers of T cell differentiation and activation, including CD25, CD39, PD-1, CTL4, KLRG1, TIM3. We will analyse neutrophils subpopulations and investigate the functional profile of granulocytes in enrolled patients. Markers such as CD66b, CD24, CD16, MHC-II, LOX1, CD36 and CD62L will be included in our analysis. In conclusion our experimental strategy will result in a comprehensive profiling of the immune landscape in PC patients at single cell level.
Locations (1)
Humanitas Research Hospital
Rozzano, Milano, Italy