A Study to Evaluate the Efficacy and Safety of Toripalimab Injection in the Treatment of Recurrent or Metastatic Gastric or Gastroesophageal Junction Adenocarcinoma Who Have Failed at Least Two Prior Lines of Therapy and Are Positive Specific Markers

This is a single-arm, multicenter, phase 2 study to assess the efficacy and safety of Toripalimab Injection (JS001) in patients with advanced recurrent or metastatic gastric or gastroesophageal junction adenocarcinoma who have failed at least 2 prior lines of therapy and are positive for specific markers. Patients who meet the requirements will be treated with Toripalimab injection 240 mg once every 3 weeks (q3w) until disease progression based on imaging according to RECIST 1.1 criteria judged by the investigator, or intolerable toxicity, or withdrawal of informed consent, or withdrawal of treatment judged by the investigator, or voluntarydiscontinuation of treatment by the patient with CR of more than 6 months, or up to 2 years of treatment for JS001, whichever occurs first. For the case that the patient shows disease progression on imaging according to RECIST 1.1, as long as the investigator judges that the patient can still benefit from continued medication, the treatment with Toripalimab Injection can be continued until the progression on imaging assessed by the investigator for the second time. The clinical benefit is based on the results of comprehensive assessment by the investigator in combination with imaging findings and clinical condition when the patient has no intolerable toxicity or the symptoms worsen due to disease progression. Tumor assessments are performed at screening (as the baseline), every 6 weeks from the first dose in the first year, and every 9 w…

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