Zanidatamab in Combination With Pembrolizumab and Chemotherapy in HER2 and PD-L1 Positive Metastatic Gastroesophageal Adenocarcinoma (GEA) Patients

Exclusion Criteria

• •Patient has any known contraindication including allergy or hypersensitivity to the trial drugs or any constituent of the products as well as a known history of severe allergic, anaphylactic, or other hypersensitivity reactions to chimeric or humanized antibodies.
• •Patient received prior anti HER2-targeted treatment for GEA.
• •Patient has malignancies other than the disease under study within 5 years prior to inclusion, except for those with a negligible risk of metastasis or death (e.g., expected 5-year OS \> 90%) treated with expected curative outcome (such as adequately treated carcinoma in situ of the cervix, basal or squamous cell skin cancer, localized prostate cancer treated surgically with curative intent, ductal carcinoma in situ treated surgically with curative intent).
• •Patient has untreated known CNS metastases. Patient is eligible, if previous CNS metastases are adequately treated and patient has neurologically returned to baseline (except for residual signs or symptoms related to the CNS treatment) for ≥ 2 weeks prior to enrolment, and did not receive corticosteroids, or is on a stable or decreasing dose of \< 10 mg daily prednisone (or equivalent) for ≥ 2 weeks prior to inclusion.
• •Patient has abnormal baseline left ventricular ejection fraction (LVEF \< 50 %), assessed by echocardiogram, multigated acquisition (MUGA) scan, or cardiac magnetic resonance imaging (MRI) scan.
• •Patient has active, known, or suspected autoimmune disease. Exception: Type I diabetes mellitus, residual hypothyroidism due to autoimmune thyroiditis only requiring hormone replacement, or skin disorders (such as vitiligo, psoriasis, or alopecia) not requiring systemic treatment are permitted to enroll. For any cases of uncertainty, it is recommended that the medical expert/sponsor be consulted prior to signing informed consent.
• •Patient has a condition requiring systemic treatment with either corticosteroids (\> 10 mg daily prednisone equivalents) or other immunosuppressive medications within 14 days of trial drug administration. Inhaled or topical steroids, and adrenal replacement doses \> 10 mg daily prednisone equivalents are permitted in the absence of active autoimmune disease.
• •Patient has persisting toxicity related to prior therapy (NCI CTCAE v.5.0 Grade \> 1); however, alopecia, sensory neuropathy Grade ≤ 2, or other Grade ≤ 2 not constituting a safety risk based on investigator's judgment are acceptable.
• •Patient has any serious or uncontrolled medical disorder or active infection that, in the opinion of the investigator, may increase the risk associated with trial participation, trial drug administration, or would impair the ability of the patient to receive trial drug.
• •Patient has significant acute or chronic infections including, among others:
• •Any positive test for human immunodeficiency virus (HIV) or known acquired immunodeficiency syndrome (AIDS).
• •Any positive test result for hepatitis B virus or hepatitis C virus indicating acute or chronic infection.
• •Patient has history of allogeneic tissue / solid organ transplant.
• •Patient has been incarcerated or involuntarily institutionalized by court order or by the authorities \[§ 40 Abs. 1 S. 3 Nr. 4 AMG\].
• •Patient is unable to consent because he/she does not understand the nature, significance and implications of the clinical trial and therefore cannot form a rational intention in the light of the facts \[§ 40 Abs. 1 S. 3 Nr. 3a AMG\].
• •Patient has evidence of any other disease, neurologic or metabolic dysfunction, physical examination finding or laboratory finding giving reasonable suspicion of a disease or condition that contraindicates the use of any of the trial medications, puts the patient at higher risk for treatment-related complications or may affect the interpretation of trial results.
• •Patient currently participates in any other interventional clinical study within 30 days before the first administration of the investigational product or at any time during the trial, unless it is an observational (non-interventional) study, or during the follow-up period of an interventional study with last dose of investigational product ≥28 days prior to enrolment in this trial.
• •Patient has a known complete absence of dihydropyrimidine dehydrogenase (DPD) activity or use of any medications known to inhibit DPD (including brivudine, sorivudine and analogs) within 4 weeks prior to enrolment.
• •Female patients, who are pregnant or breast feeding or planning to become pregnant within and 6 months after the end of treatment. Female patients of childbearing potential must have a negative serum pregnancy test result within 7 days prior to initiation of trial treatment.