Phase II Study of Cabazitaxel in Refractory Metastatic Gastric or Gastroesophageal Adenocarcinoma

Prior to initiating protocol therapy, patients will undergo screening evaluations, to be done within 30 days of protocol initiation unless otherwise noted. Patients who are taxane naïve will be assigned to arm A and patients who have had prior taxane therapy will be assigned to Arm B. Each arm will be analyzed separately for the primary study endpoint of 3 month progression free survival rate (PFS), as defined as the time from the start of treatment to the date of disease progression or death. Cabazitaxel will be administered 20 mg/m2 IV over 1 hour every 3 weeks. In the absence of treatment delays due to adverse event(s), treatment may continue until disease progression; intercurrent illness that prevents further administration of treatment; unacceptable adverse event(s); patient decides to withdraw; general or specific changes in the patient's condition render the patient unacceptable for further treatment in the judgment of the investigator. Patients will be followed for 6 months after removal from study or until death, whichever occurs first. Patients removed from study for unacceptable adverse events will be followed until resolution or stabilization of the adverse event.