Phase II Study of IMMU-132 Alone or in Combination With Carboplatin in Patients With Triple-Negative Breast Cancer

This is a Phase II, open-label study that evaluates the safety and efficacy of IMMU-132 alone and in combination with carboplatin in patients with triple-negative breast cancer. IMMU132 will be administered once-weekly for the first 2 weeks of 3-week treatment cycles. For those patients assigned to also receive carboplatin, will receive it on the same schedules starting 30 minutes after the completion of IMMU-132 administration. Patients may receive up to a maximum total of 8 cycles.

The primary objective is to evaluate the safety and efficacy of IMMU-132 alone and in combination with carboplatin administered in 3-week treatment cycles for up to 8 cycles, in patients with triple-negative breast cancer that have received at least two prior treatments. The secondary objectives are to obtain data concerning pharmacokinetics, and immunogenicity.

This is a multi-center study. Eighty patients are planned to be enrolled, with an equal distribution between the two groups. All patients will receive a starting dose of IMMU-132administered once-weekly for the first 2 weeks of 3-week treatment cycles. For those patients assigned to also receive carboplatin, carboplatin will also be administered on the same schedules starting 30 minutes after the completion of IMMU-132 administration. Patients may receive up to a maximum total of 8 cycles (16 doses), but patients with a complete response, partial response or stable disease at that time, or patients who had achieved an objective response, but relapsed after discontinuing treatment, may continue to be treated based on physician discretion. Follow up is then required until resolution or stabilization of any treatment-related toxicity, and patients with stable disease or objective responses must also continue evaluations until survived.

Eligibility Criteria:
Inclusion Criteria:

* Female subjects with triple negative metastatic breast cancer, age 18 years or older, pathologically confirmed metastatic adenocarcinoma of the breast. Pathologically confirmed as triple-negative, measurable disease, defined by (RECIST 1.1) guidelines;
* Two or more prior chemotherapy, immunotherapy and/or monoclonal antibody therapy for the treatment of the subjects' metastatic breast cancer;
* Prior neoadjuvant or adjuvant chemotherapy must have been completed at least 4 weeks before start of study treatment with all related toxicities resolved;
* Prior radiotherapy must have completed at least 2 weeks before randomization, with full recovery;
* At least 4 weeks from major surgery, ECOG performance status 0-1.
* Hematology parameters (ANC) ≥ 1500/mm2;
* Platelets ≥ 100,000/mm2;
* Hemoglobin (Hgb) ≥ 9 g/dL AST \& ALT ≤ 2.5 x ULN);
* If hepatic metastases present ≤ 5.0 x ULN Total bilirubin ≤ ULN ;
* Subjects with Gilbert's syndrome can have bilirubin of up to 1.5 x ULN;
* Alkaline phosphatase ≤ 2.5 x ULN (unless bone metastases are present in the absence of liver metastasis);
* Creatinine clearance \> 60 mL/min

Exclusion Criteria:

* Male subjects with triple negative metastatic breast cancer;
* Concurrent chemotherapy, immunotherapy or monoclonal antibody or any other anti-tumor therapy for breast cancer,
* Concurrent or prior anticoagulation therapy within 7 days of first dose of study treatment,
* History of, or known current evidence of brain metastasis, including leptomeningeal involvement;
* Subjects with bone as the only site of metastatic disease.