A Trial of BKM120 (a PI3K Inhibitor) in Patients With Triple Negative Metastatic Breast Cancer

Inclusion Criteria

• Pathologically and radiologically confirmed metastatic TNBC (Stage IV disease), previously documented by histological analysis, which is ER-negative and PR-negative by IHC and HER2 negative by IHC or FISH/CISH.
• Subjects must have received maximum two prior chemotherapy regimens for metastatic breast cancer.
• Availability of a representative tumor specimen (primary or metastasis, archival tissue or fresh biopsy for patients with biopsiable tumor) at baseline.
• At least one measurable lesion by RECIST 1.1
• Age ≥ 18 years at the day of consenting to the study
• ECOG performance status ≤ 2
• Adequate bone marrow and organ function as defined by the following laboratory values: ANC ≥ 1.0 x 109/L, platelets ≥ 100 x 109/L, hemoglobin ≥ 9.0 g/dL, INR ≤ 2; serum potassium between 3.0mmol/L and 5.5 mmol/L; Corrected serum calcium between8.0mg/dL and 11.5mg/dL (OR between 1.0mmol/L and 1.5mmol/L of Ionized calcium); serum magnesium between 1.2mg/dL and 3.0 mg/dL; serum creatinine ≤ 1.5 x ULN, ALT and AST within normal range (or ≤ 3.0 x ULN if liver metastases are present); serum bilirubin within normal range (or ≤ 1.5 x ULN if liver metastases are present; or total bilirubin ≤ 3.0 x ULN with direct bilirubin within normal range in patients with well documented Gilbert Syndrome); fasting plasma glucose (FPG) ≤ 140 mg/dL or ≤ 7.8 mmol/L.

Exclusion Criteria

• Previous treatment with PI3K inhibitors
• Symptomatic CNS metastases
• Patients with controlled and asymptomatic CNS metastases may participate in this trial. As such, the patient must have completed any prior treatment for CNS metastases > 28 days (including radiotherapy and/or surgery) prior to enrollment in this study. Patients with previously treated brain metastases, who are on a stable low dose corticosteroids treatment are eligible
• Concurrent malignancy or malignancy within 3 years of study enrollment (with the exception of adequately treated basal or squamous cell carcinoma or non-melanomatous skin cancer). An exception to this rule are those patients with documented germline mutations in BRCA1 or 2, who may have previous history of cancer
• Any of the following mood disorders as judged by the Investigator or a Psychiatrist, or meets the cut-off score of ≥ 10 in the PHQ-9 or a cut-off of ≥ 15 in the GAD-7 mood scale, respectively, or selects a positive response of '1, 2, or 3' to question number 9 regarding potential for suicidal thoughts ideation in the PHQ-9 (independent of the total score of the PHQ-9)
• Patients with a history or active episodes of major depression, bipolar disorder (I or II), obsessive-compulsive disorder, schizophrenia, history of suicide attempts or suicidal thoughts (eg. Risk of hurting or harming others) or patients with severe personality disorders (as defined by the DSM-IV) are not eligible. Note: For patients who are treated with psychotropic drugs at baseline, the dose and schedule shall not be changed during the 6 weeks prior to initiation of treatment with the study drug.
• ≥ CTCAE v 4.0 grade 3 anxiety
• Patients on concurrent use of other approved or investigational antineoplastic and / or chemotherapy or any continuous or intermittent treatment with therapeutic agents of low molecular weight (excluding monoclonal antibodies) in ≤ 21 days prior to enrollment in this study or who have not recovered from the effects such therapy will not be eligible.
• Radiotherapy ≤ 28 days prior to enrollment in this study or failure to recover from side effects of such therapy at the time of initiation of screening procedures.
• Major surgery within 28 days prior to starting study drug or has not recovered from major side effects of the surgery
• Poorly controlled diabetes mellitus (HbA1c > 8%)
• Active cardiac disease including any of the following:
• Left Ventricular Ejection Fraction (LVEF) 480 msec on screening ECG (using the QTcF formula
• Angina pectoris that requires the use of anti-anginal medication
• Ventricula