Particle-based Partial Tumor Irradiation of Unresectable Bulky Tumors

Cancer Clinical Trial

— PARTICLE-PATHY  

Official title:

Particle-based Partial Tumor Irradiation Targeting Hypoxic Segment and Sparing the Peritumoral Immune Microenvironment for Unresectable Bulky Tumors

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT04875871
• Other study ID #: PATHY-MA-072020
• Status: Recruiting
• Phase: N/A
• Start date: November 11, 2021
• Est. completion date: December 2025

Study information

• Verified date: March 2024
• Source: EBG MedAustron GmbH
• Contact: Slavisa Tubin, M.D.
• Phone: +43 2622 26 100
• Email: slavisa.tubin[@]medaustron.at
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

This study uses a novel, recently developed unconventional radiotherapy technique which consists of three high-dose fractions directed to special segments of unresectable bulky tumors.

Description:

This is a mono-centric, prospective, two-arms, feasibility study in which the investigator will enroll up to 22 patients with locally advanced or metastatic cancers with at least one bulky (≥6cm) lesion. This study uses a novel, recently developed unconventional radiotherapy technique, consisting of a short course (3 fractions) high dose partial irradiation targeting exclusively the hypoxic segment of unresectable bulky tumors while sparing the peritumoral immune microenvironment for induction of immune-mediated tumoricidal bystander and abscopal effects. The present study will explore the potential biological and physical advantages of particle-based radiotherapy to deliver a highly conformal radiation dose to the hypoxic tumor segment defined by using hypoxia-specific Copper-64-Diacetyl-bis (N4-methylthiosemicarbazone) Positron Emission Tomography-Computer Tomography (64Cu-ATSM PET-CT) and dynamic contrast enhanced Magnetic Resonance Tomography imaging. Based on tumor location, volume and risk factors related to nearby organs at risk, patients will be divided in the "high-dose" or "reduced-dose" group which will be treated with different dose-schedules according to risk factors. Additionally, radiotherapy will be administered at the precise timing, determined individually for each patient, based on the serially mapped homeostatic immune fluctuations by monitoring blood levels of the inflammatory markers. The objective is to synchronize the radiation treatment with the favorable, most reactive anti-tumor immune response phase, in order to break tumor´s immune-tolerance locally and systemically.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 22
• Est. completion date: December 2025
• Est. primary completion date: December 2025
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

1. Written informed consent obtained from the patient prior to performing any treatment-related procedures.

2. Biopsy proven malignant unresectable solid bulky primary or recurrent tumor (diameter of at least 6 cm or greater, except for the Central Nervous System (CNS) tumors), or in a case of lack of recent biopsy progression on at least two consecutive radiological examinations, with biopsy proof in the past. Presence of locally advanced (cN+) and/or metastatic disease will be accepted in order to allow for assessment of the abscopal effects.

3. Ineligibility for standard treatments including surgery, conventional (whole tumor) radiotherapy and systemic therapy, or being in progression or stable (with no response to systemic treatment) under systemic therapy.

4. A minimum time interval from last dose of systemic therapy before radiotherapy of two weeks; Systemic therapy may be resumed 4 weeks following radiotherapy in order to permit assessment of the treatment efficacy.

5. Median life expectancy of >2 months.

6. Age > 18 years.

7. Adequate bone marrow function as follows below: Haemoglobin = 8.0 g/d; Absolute neutrophil count (ANC) = 1.5 x 10?/L (> 1500 per mm3); Platelet count = 100 x 10?/L (>100,000 per mm3).

8. Female patients must either be of non-reproductive potential (i.e. post-menopausal by history: =60 years old and no menses for =1 year without an alternative medical cause; OR history of hysterectomy, OR history of bilateral tubal ligation, OR history of bilateral oophorectomy) OR women of fertile age must have adequate conception prevention measures and must have a negative serum pregnancy test upon study entry.

9. Patient is willing and able to comply with the follow up including scheduled visits and examinations.

Exclusion Criteria:

1. Patients without bulky lesions.

2. Tumors suitable for the standard therapies including surgery, conventional (whole tumor) irradiation and systemic therapies.

3. Median life expectancy of less than 2 months.

4. Contraindication to i.v. Computer Tomography and Magnetic Resonance Tomography contrast medium administration, particularly estimated glomerular filtration rate (GFR) less than 45 mL/min/1.73 m2.

5. History of autoimmune disease.

6. Current or prior use of immunosuppressive medication within 14 days before enrollment with the exceptions of intranasal and inhaled corticosteroids or systemic corticosteroids at physiological doses, which are not to exceed 10 mg/day of prednisone, or an equivalent corticosteroid.

7. History of primary immunodeficiency.

8. History of allogeneic organ transplant.

9. Uncontrolled intercurrent comorbidity including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, uncontrolled hypertension, unstable angina pectoris, active bleeding diatheses including any patient known to have evidence of acute or chronic hepatitis B, hepatitis C or human immunodeficiency virus (HIV), or psychiatric illness/social situations that would limit compliance with study requirements or compromise the ability of the patient to give written informed consent.

10. Female patients who are pregnant, breast-feeding or male or female patients of reproductive potential who are not employing an effective method of birth control.

11. Any condition that, in the opinion of the investigator, would interfere with evaluation of study treatment or interpretation of patient safety or study results. (Note: criterion will be evaluated on the four eyes principle, evaluated by both Principle Investigator and Sub-Investigators.)

12. Patients with uncontrolled seizures.

Related Conditions & MeSH terms

• Cancer

Intervention

Radiation:
• Particle radiotherapy
Partial radiotherapy targeting the hypoxic tumor segment

Diagnostic Test:
• Magnetic resonance imaging
For treatment planning as well as for follow-up radiological tumor assessment.
• Computertomography
For treatment planning as well as for follow-up radiological tumor assessment.
• Copper-64-Diacetyl-bis (N4-methylthiosemicarbazone) Positron Emission Tomography-Computer Tomography (64Cu-ATSM-PET-CT)
For the definition of the hypoxic tumor segment in treatment planning.
• 18-F-FluorDesoxyGlukose Positron Emission Tomography-Computer Tomography (18F-FDG-PET-CT)
For follow-up radiological tumor assessment.
• Blood sampling
Evaluation before treatment-start, during treatment and follow-up period.

Locations

Country	Name	City	State
Austria	EBG MedAustron GmbH	Wiener Neustadt	Niederösterreich

Sponsors (4)

Lead Sponsor	Collaborator
EBG MedAustron GmbH	Klinik Ottakring, Landesklinkum Wiener Neustadt, Medical University of Vienna

Country where clinical trial is conducted

Austria, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Bystander (local) tumor response rate	Bystander (local, at the level of the partially treated bulky tumor) response rate defined as at least a 30% regression of the unirradiated tumor tissue.	11 months (after treatment)
Secondary	Feasibility of PARTICLE-PATHY	Feasibility of patient recruitment, treatment and follow-up rates.	3,5 years (recruiting time + treatment time + 11 months follow-up)
Secondary	Overall survival	Defined as the time from treatment until the time of death from any cause.	11 months (after treatment)
Secondary	Time to local tumor progression	Defined as the time from treatment until the time of local disease progression.	11 months (after treatment)
Secondary	Time to distant tumor progression	Defined as the time from treatment until the time of distant disease progression.	11 months (after treatment)
Secondary	Abscopal (distant) tumor response rate	Defined as the proportion of metastatic patients that exhibited an abscopal effect versus the total number of metastatic patients allocated to the treatment.	11 months (after treatment)
Secondary	Symptoms relief	Proportion of patients who will achieve a partial or complete relief at different time-points.	11 months (after treatment)
Secondary	Radiation related toxicity	Toxicity assessment according to NCI CTCAE v5.0	11 months (after treatment)
Secondary	Feasibility of timing of PARTICLE-PATHY and its relation to clinical outcomes	The feasibility of PARTICLE-PATHY and to it related TIMING will be defined by the proportion of patients allocated to this treatment who received it within dosimetric constraints after being able to define the immune-cycle periodicity and to synchronize radiotherapy with it versus the total number of patients allocated to the treatment.	Until 11 months after treatment
Secondary	Bystander/abscopal response rate in relation to dose-size of Peritumoral Immune Microenvironment (PIM)	See title	11 months (after treatment)
Secondary	Bystander/abscopal response rate in relation to Interleukin-2 and Interferon Gamma values	Two key cytokines, Interleukin-2 (IL-2) and Interferon Gamma (INFg), will be serially assessed at baseline and after each radiotherapy treatment, in order to determine their potential role in modulating the immune response in relation to the bystander/abscopal effects.	11 months (after treatment)