Tesetaxel as First-line Therapy for Metastatic Breast Cancer

Inclusion Criteria

• Female
• At least 18 years of age
• Histologically or cytologically confirmed adenocarcinoma of the breast
• Stage IV disease
• HER2 status negative
• Measurable disease (revised RECIST; Version 1.1)
• Eastern Cooperative Oncology Group performance status 0 or 1
• Life expectancy of at least 3 months
• Chemotherapy naïve or 1 prior chemotherapy regimen in the adjuvant setting (Prior taxane-based adjuvant therapy allowed provided patient had a disease-free interval of at least 12 months after completing this adjuvant therapy)
• Prior hormonal therapy, aromatase inhibitor therapy, and immunotherapy allowed
• Prior radiotherapy in the adjuvant setting allowed provided that less than 25% of the bone marrow had been irradiated
• Adequate bone marrow, hepatic, and renal function, as specified in the protocol
• At least 4 weeks and recovery from effects of prior surgery, hormonal therapy, aromatase inhibitor therapy, immunotherapy, radiotherapy, or other therapy with an approved or investigational agent
• Ability to swallow an oral solid-dosage form of medication Primary

Exclusion Criteria

• Known metastasis to the central nervous system
• History of other malignancy within the last 5 years other than curatively treated basal and squamous cell carcinoma of the skin or carcinoma of the cervix in situ
• Significant medical disease other than Stage IV breast cancer
• Presence of neuropathy > Grade 1 (NCI CTC, Version 4.0)
• History of hypersensitivity to a taxane
• Need to continue any regularly-taken medication that is a potent inhibitor or inducer of the CYP3A pathway or P-glycoprotein activity