Gall Bladder Cancer Clinical Trial
Official title:
Systemic Therapy With or Without Radiation Therapy in Unresectable Nonmetastatic Gall Bladder Carcinoma: Open Label, Parallel Arm, Phase 2/3 Integrated Randomized Clinical Trial
The goal of this clinical trial is to compare two treatment regimes, namely, systemic therapy (chemotherapy and/or immunotherapy) alone vs. systemic therapy and radiation therapy in patients with inoperable but localized gallbladder cancer. The main questions it aims to answer are: - Whether adding radiation therapy to systemic therapy improves overall survival? - What are the effects on other endpoints like cancer-free intervals, side effects, and quality of life? Participants will be randomly assigned to one of the two treatment regimes mentioned earlier by a computer-based program. Researchers will compare survival and quality of life outcomes between the two groups.
Gallbladder cancer (GBC) incidence is exceptionally high in India and most patients present with an unresectable or advanced disease. There is limited clinical evidence on optimal therapy of biliary tract cancers in general and more so for gall bladder cancers which are relatively rare in the Western world. As per current clinical practice, Surgery remains the mainstay of curative treatment for resectable GBC, and systemic therapy with or without radiotherapy is offered for unresectable GBC. The current standard of systemic therapy is to administer 6 months of Gemcitabine-based regimen and the median overall survival of these patients is about 10-12 months. The national and Institutional guidelines suggest the use of radiation in unresectable GBC. The role of radiation therapy in this setting has not been evaluated in phase 3 randomized clinical trials although it is being offered routinely at our Centre if the patients remain nonmetastatic after initial systemic therapy. We propose a phase 2/3 integrated randomized clinical trial evaluating the role of adding radiotherapy to chemotherapy in improving survival outcomes in patients with unresectable GBC based on nonrandomized data from our institution suggesting a benefit with the addition of radiation therapy in this setting. Patients with histologically verified, unresectable GBC who do not progress (RECIST 1.1) after an initial 3 months of Gemcitabine-based systemic therapy are invited to participate in this open-label, parallel arm, superiority design randomized controlled trial. Patients randomized to the 'RT arm' will receive hypo fractionated conformal image-guided radiotherapy to a dose of 40-55Gy in 10 (up to 15) fractions to the primary and regional lymph node basins delivered over 2-3 weeks. Systemic therapy is resumed after completion of radiotherapy for 3 more months. The patients in the 'Chemo alone arm' or 'Systemic therapy alone' arm will complete 3 more months of systemic therapy as per the current institutional standard. All patients will be considered for further systemic therapy (either as maintenance therapy or at the time of relapse) at the discretion of the treating medical oncologist. The primary outcomes of the Phase 2 and Phase 3 components are progression-free survival and Overall survival respectively with an interim analysis planned at 36 months to evaluate futility. Secondary outcomes include local control, toxicity, and quality of life measures. The estimated sample size 249 is and the expected duration of the study is 67 months including the follow-up period. ;
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