ATR Kinase Inhibitor M6620 and Irinotecan in Treating Patients With Progressive, Metastatic, or Unresectable TP53 Mutant Gastric or Gastroesophageal Junction Cancer

Conditions:   Clinical Stage III Gastric Cancer AJCC v8;   Clinical Stage III Gastroesophageal Junction Adenocarcinoma AJCC v8;   Clinical Stage IV Gastric Cancer AJCC v8;   Clinical Stage IV Gastroesophageal Junction Adenocarcinoma AJCC v8;   Clinical Stage IVA Gastric Cancer AJCC v8;   Clinical Stage IVA Gastroesophageal Junction Adenocarcinoma AJCC v8;   Clinical Stage IVB Gastric Cancer AJCC v8;   Clinical Stage IVB Gastroesophageal Junction Adenocarcinoma AJCC v8;   Metastatic Gastric Adenocarcinoma;   Metastatic Gastroesophageal Junction Adenocarcinoma;   Pathologic Stage III Gastric Cancer AJCC v8;   Pathologic Stage III Gastroesophageal Junction Adenocarcinoma AJCC v8;   Pathologic Stage IIIA Gastric Cancer AJCC v8;   Pathologic Stage IIIA Gastroesophageal Junction Adenocarcinoma AJCC v8;   Pathologic Stage IIIB Gastric Cancer AJCC v8;   Pathologic Stage IIIB Gastroesophageal Junction Adenocarcinoma AJCC v8;   Pathologic Stage IIIC Gastric Cancer AJCC v8;   Pathologic Stage IV Gastric Cancer AJCC v8;   Pathologic Stage IV Gastroesophageal Junction Adenocarcinoma AJCC v8;   Pathologic Stage IVA Gastroesophageal Junction Adenocarcinoma AJCC v8;   Pathologic Stage IVB Gastroesophageal Junction Adenocarcinoma AJCC v8;   Postneoadjuvant Therapy Stage III Gastric Cancer AJCC v8;   Postneoadjuvant Therapy Stage III Gastroesophageal Junction Adenocarcinoma AJCC v8;   Postneoadjuvant Therapy Stage IIIA Gastroesophageal Junction Adenocarcinoma AJCC v8;   Postneoadjuvant Therapy Stage IIIB Gastroesophageal Junction Adenocarcinoma AJCC v8;   Postneoadjuvant Therapy Stage IV Gastric Cancer AJCC v8;   Postneoadjuvant Therapy Stage IV Gastroesophageal Junction Adenocarcinoma AJCC v8;   Postneoadjuvant Therapy Stage IVA Gastroesophageal Junction Adenocarcinoma AJCC v8;   Postneoadjuvant Therapy Stage IVB Gastroesophageal Junction Adenocarcinoma AJCC v8;   TP53 Gene Mutation;   Unresectable Gastroesophageal Junction Adenocarcinoma
Interventions:   Drug: ATR Kinase Inhibitor M6620;   Drug: Irinotecan
Sponsor:   National Cancer Institute (NCI)
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