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PET Guided Dose Reduction for InvOlved Site Radiotherapy In Early sTage Unfavourable Hodgkin Lymphoma

PET Guided Dose Reduction for InvOlved Site Radiotherapy In Early sTage Unfavourable Hodgkin Lymphoma: a Randomized, Phase III, Non-inferiority studY (PRIORITY Study)

Status
Recruiting
Phases
Phase 3
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07256158
Acronym
FIL_PRIORITY
Enrollment
518
Registered
2025-12-01
Start date
2026-07-10
Completion date
2033-08-01
Last updated
2026-08-27

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Hodgkin Lymphoma

Keywords

Hodgkin lymphoma, Early stage, unfavourable, untreated, ABVD, chemotherapy, radiotherapy, 20 Gy, 30 Gy, randomization, PET guided, involved site

Brief summary

The final analysis of GHSG HD11 study (not PET driven) showed that 30 Gy IFRT still remains the standard dose after 4 ABVD. Early PET negativity might allow safe radiation de-escalation in patients achieving a metabolic complete response after 2 ABVD. The aim of Priority trial is to explore whether radiotherapy could be safely deescalated to 20 Gy without loss of efficacy in patients treated with four cycles of ABVD who achieved complete metabolic response after the first two cycles.

Interventions

RADIATION20 Gy Involved site radiotherapy

Total dose 20 Gy Involved site radiotherapy

RADIATION30 Gy Involved site radiotherapy

Total dose 30 Gy Involved site radiotherapy

Sponsors

Fondazione Italiana Linfomi - ETS
Lead SponsorOTHER

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE

Intervention model description

Randomized, Phase III, Non-inferiority study

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Age ≥18 years; * Histologically confirmed classical HL stage I, II unfavorable according to GHSG criteria; * Patient with any nodal mass ≥ than 10 cm can be included * No previous treatment for Hodgkin lymphoma; * ECOG performance status 0 to 2; * Presence of FDG-avid lymphoma lesions on baseline PET scan; * Subject understands and voluntarily signs the informed consent form approved by the Independent Ethics Committee (IEC), prior to the initiation of any screening or study-specific procedures; * Adequate organ and marrow function as defined below: * absolute neutrophil count \> 1.0 x109/L * platelet count \> 75 x109/L * Total bilirubin \< 2 mg/dl without a pattern consistent with Gilbert's syndrome * Aspartate Transaminase and Alanine Transaminase (AST/ALT) \< 3.0 X institutional Upper Limits of Normality (ULN) * Creatinine within normal institutional limits or creatinine clearance \> 50 mL/min * Women of childbearing potential must agree to use a highly effective method of contraception (oral contraceptives, contraceptive injections, contraceptive patch, intrauterine device) from the signature of informed consent until six months after the last dose of treatment; * Men must agree to use a highly effective method of contraception (barrier contraception or abstinence, when this is in line with the usual lifestyle of the subject) from the signature of informed consent until six months after the last dose of treatment; * Women of childbearing potential must have a negative serum pregnancy test at screening.

Exclusion criteria

* Patients who meet any of the following criteria are not eligible to enroll: * Stage II B- III- IV * Hodgkin Lymphoma as "composite lymphoma" or nodular lymphocyte prevalence histological subtype * Active HBV and HCV infection * HIV seropositivity * Pre-treatment with chemotherapy or radiation therapy * Malignant disease within the last 5 years (excluding basal skin tumors and carcinoma in situ of the cervix) * Women who are pregnant or breast feeding * Absence of FDG-avid lymphoma lesions on baseline PET scan * Significant history of neurologic, psychiatric, endocrinological, metabolic, immunologic, or hepatic disease that would preclude participation in the study or compromise ability to give informed consent.

Design outcomes

Primary

MeasureTime frameDescription
To evaluate if de-escalated ISRT dose (20 Gy) is not inferior to conventional ISRT dose (30 Gy) in terms of PFS in patients with newly diagnosed early-stage unfavourable HL achieving a complete metabolic response (DS 1-3) after 2 ABVD cycleFrom the date of randomization to documented relapse, progression or to the patient's death as a result of any causes (up to 82 months).Progression-Free Survival (PFS) of the randomized population. Subjects with incomplete follow-up or with no disease evaluation will be censored at the date of last available documented status of freedom from failure.

Secondary

MeasureTime frameDescription
To compare OS rates between de-escalated ISRT dose (20 Gy) and conventional ISRT dose (30 Gy) in patients with newly diagnosed early-stage unfavourable HL achieving a complete metabolic response (DS 1-3) after 2 ABVD cycles;From the time of randomization to death from any cause (up to 82 months)Overall Survival (OS) for the randomized population
To evaluate PFS for the whole populationFrom the date of consent to documented relapse, progression or death from any cause (up to 84 months)Progression free survival for the whole enrolled population
To evaluate OS for the whole populationFrom the date of consent to death from any cause (up to 84 months)Overall Survival (OS) for the whole population
To describe pattern of failure "in field", "marginal field", "out of field" relapse after conventional and reduced ISRT;From the date of consent to death from any cause (up to 84 months)Incidence and severity of Adverse Events, graded according to the latest version of the Common Terminology Criteria for Adverse Events (CTCAE v 5.0) during the treatment
To report details on RT treatment volumes and dose distributions and to estimate the dose received by the organs at risk (OARs) in the two treatment armsAt time of radiotherapy (about 4 months from chemotherapy start)RT dose received by organs at risk (OARs).

Countries

Italy

Contacts

CONTACTUffici Studi FIL
startup@filinf.it+390131033153
PRINCIPAL_INVESTIGATORUmberto Ricardi, MD

SC Radioterapia U - AOU Città della Salute e della Scienza di Torino

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Aug 28, 2026