Clinical trial NCT05009927: Efficiency of Imatinib Treatment After 10 Years of Treatment in Patients With Gastrointestinal Stromal Tumours (GIST) (Gist-Ten)
Official title: Randomized, Multicentre, Phase II Study Evaluating the Interest of Imatinib Treatment Maintenance or Interruption After at Least 10 Years of Treatment in Patients With Locally Advanced/Metastatic Gastrointestinal Stromal Tumors (GISTs)
Study type: INTERVENTIONAL
Overall status: RECRUITING
Phase: PHASE2
Conditions: Metastatic Gastrointestinal Stromal Tumor (GIST)
C-KIT Mutation
Advanced Gastrointestinal Stromal Tumor (GIST)
Keywords: Gastrointestinal Stromal Tumors (GIST)
Tyrosine kinase inhibitor
Maintenance therapy
Bayesian design
KIT +
Imatinib
Randomisation study
Lead sponsor: Centre Leon Berard
Sponsor class: OTHER
First posted: 2021-08-18
Enrollment: 50
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: This is a 2 arms study concerning patients under imatinib treatment for at least 10 years of treatment with locally advanced/metastatic GIST.

In the first arm, patients will discontinue Imatinib treatment. This arm will allow to determine if the re-introduction of Imatinib at relapse is still an efficient treatment for the control of disease.

In the second arm, patients will continue Imatinib treatment, allowing to determine if the continuation of this treatment is efficient for disease control, by the rate of non-progression disease.

Detailed description: Gastrointestinal stromal tumors (GISTs) arise from mesenchymal stem cells which also give rise to the interstitial cells of Cajal within the GI tract. A large majority of GIST tumors harbour activating mutations in the proto-oncogenes KIT and/or PDGFRA, both coding cell-surface cytokine receptors with tyrosine-protein kinase activity.

Imatinib mesilate (Glivec®, Novartis Pharma SAS) is a selective tyrosine kinase inhibitor, leading to inhibition of KIT and PDGFRA signalling pathways. The introduction of imatinib has revolutionised the therapeutic management of GIST patients and has provided an unprecedented demonstration of the clinical benefit of a targeted therapy for patients with advanced/metastatic solid tumors.

Several studies have investigated the optimal duration of imatinib treatment in the advanced phase. The BFR14 trial demonstrated that 31% of advanced GIST patients treated with continuous imatinib beyond 1 year had documented disease progression compared to 81% in the interrupted imatinib group (p\<0.0001). The authors concluded that treatment interruption resulted in rapid progression in most patients with advanced GIST and therefore should not be recommended in standard practice unless the patient experienced significant toxicity or disease progression. An update of the BFR14 trial at a median follow-up of 37 months showed that 91% of patients in the interrupted arm versus 62% in the continuous arm experienced progressive disease (p\<0.0001). Majority (92%) of patients in the interrupted arm achieved tumor control once they recommenced imatinib after first progression. Ray-Coquard et al. reported that stopping imatinib after 5 years resulted in a higher rate of disease progression than imatinib maintenance in patients with advanced GIST responding to or stabilised by imatinib.

However, whether lifelong imatinib treatment duration is mandatory in metastatic GIST patients remains unclear. It is not known whether a cytostatic treatment of 10 years or longer is sufficient to inhibit definitively GIST cancer cells proliferation even after the interruption of the kinase inhibitor. This question has broad implications for all targeted therapies.

The aim of the present study is to address this question rigorously in a randomized setting. The investigators therefore want to determine whether prolonged use of imatinib beyond 10 years is needed to reduce the risk of GIST recurrence and to improve overall survival. For patients with imatinib interruption after at least 10 years of treatment, the investigators want to determine if imatinib rechallenge is efficient for treating recurrence. Therefore, the investigators design an open-label, randomized, multicenter phase II study to determine the clinical impact of maintaining imatinib treatment beyond 10 years in patients with locally advanced/metastatic GIST.

Eligibility criteria: Inclusion Criteria:

* Patients ≥18 years of age;
* Histologically documented diagnosis of malignant advanced/metastatic GIST with immunohistochemical documentation of c-kit (CD117) expression either by the primary tumor or metastases;
* Eastern Cooperative Oncology Group (ECOG) - Performance status (PS) 0 to 2 evaluated within 7 days prior to the date of inclusion.
* Patient must be under imatinib treatment (at 300 or 400mg/day) maintained for 10 years or over with no more than 12 months in total or 3 consecutive months of interruption during the treatment period;
* Patient with controlled disease (without any progression under imatinib);
* Willingness and ability to comply with scheduled visits, treatment plans , laboratory tests, and other study procedures;
* Covered by a medical/health insurance;
* Signed and dated informed consent document indicating that the patient has been informed of all aspects of the trial prior to enrolment.

Exclusion Criteria:

* Patient concurrently using other approved or investigational antineoplastic agents;
* Patient with GIST harboring the mutation D842V in PDGFRA;
* Major concurrent disease affecting cardiovascular system, liver, kidneys, haematopoietic system or else considered as clinically important by the investigator and that could be incompatible with patient's participation in this trial or would likely interfere with study procedures or results;
* Prior history of other malignancies other than study disease (except for basal cell or squamous cell carcinoma of the skin or carcinoma in situ of the cervix) unless the patient has been free of the disease for at least 3 years;
* Patient receiving concurrent treatment with warfarin (acceptable alternative: low-molecular weight heparin) or any prohibited concomitant and/or concurrent medications
* Patient has a known diagnosis of human immunodeficiency virus (HIV) infection;
* Major surgery within 2 weeks prior to study entry.
* Known psychiatric or substance abuse disorders that would interfere with cooperation with the requirements of the study.
* Pregnant or breastfeeding woman
* Patient requiring tutorship or curatorship or patient deprivied of liberty.

Primary outcomes:
measure: Progression-free-rate at 6 months (PFR 6m)
timeFrame: 6 months after randomization
Secondary outcomes:
measure: Progression-free-survival (PFS)
timeFrame: 5 years (i.e. at the the time of last patient last visit)
measure: Overall Survival (OS)
timeFrame: 5 years (i.e. at the the time of last patient last visit)
measure: Safety profile
timeFrame: 5 years (i.e. at the the time of last patient last visit)
measure: Quality of Life (QoL)
timeFrame: 5 years (i.e. at the the time of last patient last visit)
measure: Progression-free survival rechallenge
timeFrame: 5 years (i.e. at the the time of last patient last visit)
measure: Objective Response Rate (ORR) after imatinib reintroduction
timeFrame: 5 years (i.e. at the the time of last patient last visit)
measure: Duration of response (DOR)
timeFrame: 5 years (i.e. at the the time of last patient last visit)
Other outcomes:
Locations:
city: Besançon
country: France
facility: CHU Besançon
city: Bordeaux
country: France
facility: Institut Bergonié
city: Limoges
country: France
facility: CHU Dupuytren
city: Lyon
country: France
facility: Centre Léon Bérard
city: Marseille
country: France
facility: Institut Paoli Calmettes
city: Paris
country: France
facility: Institut Curie
city: Reims
country: France
facility: CHU de Reims
city: Rennes
country: France
facility: Centre Eugène Marquis
city: Saint-Herblain
country: France
facility: Institut de Cancérologie de l'Ouest - Site Réné Gauducheau
city: Saint-Paul-en-Jarez
country: France
facility: Institut de Cancérologie Lucien NEUWIRTH
city: Toulouse
country: France
facility: Institut Claudius Regaud
city: Vandœuvre-lès-Nancy
country: France
facility: Institut de Cancérologie de Lorraine
city: Villejuif
country: France
facility: Institut Goustave Roussy
Study officials:
affiliation: Centre Léon Bérard, Lyon
name: Jean-Yves BLAY, Pr
role: PRINCIPAL_INVESTIGATOR
References: