A Study To Test The Effect Of Apatinib On P450 Enzymes

A Single-center, Open-Label, Drug Interaction Study to Determine the Effects of Apatinib on the Metabolism of CYP3A4/5 and CYP2C9 Probe Drugs in Patients With Solid Tumors

Apatinib, an oral inhibitor of vascular endothelial growth factor receptor 2（VEGFR-2）, inhibits multiple cytochrome P450 (CYP450) enzymes in vitro. This study in patients with advanced cancer evaluated the effect of Apatinib on CYP450 function by comparing the pharmacokinetics of CYP-specific probe drugs in the presence and absence of Apatinib. The probes used included Nifedipine (CYP3A specific), warfarin (CYP2C9 specific).

This open-label study consists of a drug interaction phase that (part A) and a drug-continuation phase (part B). Patients will receive CYP450-probe drugs, and PK assessments will be performed before apatinib-administration and aſter once-daily administration of apatinib for 5 days (the predicted time point when steady-state plasma apatinib concentrations will have been achieved).

Inclusion Criteria:

• Histologically or cytologically confirmed diagnosis of advanced solid tumors.
• Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.
• Adequate bone marrow, renal, lung, and liver function.
• A female subject must not be pregnant and will agree not to become pregnant during the trial

Exclusion Criteria:

• Primary carcinoma of liver
• Any major surgery, chemotherapy, hormone therapy, investigational drugs, or radiotherapy within the last 28 days.
• Poorly controlled hypertension.
• A prior history of cardiovascular disease, arrhythmias, or significant ECG abnormalities, and corrected QT (QTc) prolongation defined as a QTc interval greater than or equal to 450 msec(male) or 470 msec(female).
• Arterial or venous thrombi (including cerebrovascular accident).
• Current use of therapeutic anticoagulation (low molecular weight heparin, oral anticoagulant agents).
• Active brain metastases.
• A history of bleeding problems.