A Safety Study of SGN-LIV1A in Breast Cancer Patients

Open to females ages 18 years and up

• Pathologically confirmed diagnosis of breast cancer with radiographic evidence of incurable, unresectable, locally advanced or metastatic disease (LA/MBC)
• One of the following:
• Part A: Triple-negative disease (ER/PR/HER2-negative) and received at least 2 prior cytotoxic regimens in the incurable, unresectable, LA/MBC setting; or ER-positive and/or PR-positive/HER2-negative disease and received at least 2 prior cytotoxic regimens in the incurable, unresectable, LA/MBC setting and are no longer a candidate for hormonal therapy (not enrolling new patients);
• Part B: Combination Arm: HER2-positive disease and received at least 2 prior cytotoxic regimens in the incurable, unresectable, LA/MBC setting (not enrolling new patients);
• Part C: Triple-negative disease and received 2-4 prior non-hormonally-directed therapies in the MBC setting (not enrolling new patients);
• Part D and Part E (dose-expansion cohort): Triple-negative disease and received 1 prior non-hormonally-directed or cytotoxic therapy in the MBC setting; or
• Part E: HR+(ER-positive and/or PR-positive)/HER2-negative disease who are chemotherapy-eligible and not considered a candidate for further hormonal therapy. Must have received no more than 1 prior non-hormonally-directed or cytotoxic therapy in the LA/MBC setting.
• Parts A, B, C, and D: Newly obtained tumor tissue biopsy and archived tumor tissue, if available, must be collected for central pathology determination of LIV-1 expression
• Part E: Archival baseline tumor sample is required; a fresh biopsy sample may be submitted in place of an archival sample if medically feasible.
• Measurable disease
• Eastern Cooperative Oncology Group performance status 0 or 1
• Combination Arm: adequate heart function