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This is a multi-center, open label, randomized phase II trial for patients with previously untreated metastatic or locally advanced esophagogastric cancer, using a pick the winner design to identify the best combination therapy in terms of progression free survival and neurotoxicity.
Full description
The sample size to identify the best combination therapy is based on the following decision making strategy. With less or even zero neurotoxicity grade 2-4 (defined as worst toxicity), the Nal-IRI plus 5FU/LV combination is expected to outperform the standard combination capecitabine plus oxaliplatin and may also outperform capecitabine plus carboplatin. To compensate for a higher neurotoxicity grade 2-4 level, the capecitabine combinations should demonstrate increased progression free survival (PFS) according to the next schedule.
With the addition of nivolumab in the second quarter of 2022, the capecitabine combinations are expected to have a PFS benefit over the Nal-IRI of 0.65 months (50% of the 1.7 months seen in the CM6495, because 50% of the capecitabine regimens will be treated with nivolumab)
If the difference in the percentage of patients experiencing neurotoxicity grade 2-4 stays within the 10-30% range, an increase of at least 3.65 months of PFS identifies the most preferable combination strategy; if the percentage is ≤10% and the PFS increase <3.65 months, but in favor of carboplatin, then the choice should be based on other grade 3-4 toxicities observed; otherwise, the strategy with the lowest level of neurotoxicity grade 2-4 is the most preferable one. At least 4.65 months PFS should be gained to compensate for a difference in neurotoxicity grade 2-4 within the >30 to 50% range.
The total number to be included will be 272. Patients will first be tested for PD-L1 and then will be conditionally randomized. Patients with a PD-L1 CPS <5 or a contraindication for nivolumab treatment, will be randomized to respectively the Nal-IRI plus 5FU, the capecitabine plus carboplatin and capecitabine plus oxaliplatin group following a 2:1:1 scheme. Patients with a PD-L1 CPS ≥5 will be randomized to the capecitabine plus carboplatin and capecitabine plus oxaliplatin group following a 2:1 scheme and will receive nivolumab in addition to chemotherapy treatment.
Taking into account 15% withdrawal of patients from the trial before start of study medication, we will include 320 patients.
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Inclusion criteria
Patients must provide written informed consent according to International Conference on Harmonization (ICH)/Guideline for Good Clinical practice (GCP), and national/local regulations prior to any screening procedures.
Male or female adult patients (> 18 years).
Patients with histologically confirmed diagnosis of metastatic or irresectable human epidermal growth (HER2) negative adenocarcinoma of the stomach or oesophagus; patients with HER2 positive disease are eligible when treatment with trastuzumab is contraindicated. If histology cannot be obtained, cytology is acceptable to prove metastatic disease.
Patients with metastatic or irresectable adenocarcinoma of the stomach or oesophagus not pre-treated with chemotherapy or radiotherapy for irresectable or metastatic disease. Palliative radiotherapy on the primary tumor or a metastatic lesion is allowed if other untreated lesions eligible for evaluation are present.
Measurable disease as assessed by RECIST 1.1
Eastern Cooperative Oncology Group (ECOG) (WHO) performance status 0-2
Patient has adequate bone marrow and organ function as defined by the following laboratory values:
Serum total bilirubin within ≤ 1.5 x ULN (upper limit of normal); or total bilirubin < 3.0 x upper limit of normal (ULN) with direct bilirubin within normal range in patients with well documented Gilbert's syndrome; biliary drainage is allowed for biliary obstruction
Serum creatinine < 1.5 x ULN or creatinine clearance >30 mL/min/1.73 m2
Alanine aminotransferase (AST) and aspartate aminotransferase (ALT) < 2.5x ULN within normal range or < 5.0 x ULN if liver metastases are present
If a female patient is of child-bearing potential, as evidenced by regular menstrual periods, she must have a negative serum pregnancy test, beta-human chorionic gonadotropin (β-hCG) documented 72 hours prior to the first administration of study drug. If sexually active, the patient must agree to use contraception considered adequate and appropriate by the Investigator during the period of administration of study drug and after the end of treatment as recommended.
Absence of any psychological, familial, sociological or geographical condition potentially hampering compliance with the study protocol and follow-up schedule; those conditions should be discussed with the patient before registration in the trial.
Exclusion criteria
Primary purpose
Allocation
Interventional model
Masking
320 participants in 3 patient groups
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Central trial contact
Hanneke WM van Laarhoven, MD, PhD, PhD; Denice Kamp, MD
Data sourced from clinicaltrials.gov
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