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Patients with metastatic triple-negative breast cancer (TNBC) have poor treatment outcomes. We reviewed the electronic records of consecutive patients with metastatic TNBC treated in phase I clinic at MD Anderson Cancer Center (Houston, TX) between Augu st 2005 and May 2012. One hundred and six patients received at least 1 phase I trial. Twelve of 98 evaluable patients (12%) had either complete response (CR; n = 1), partial response (PR; n = 7), or stable disease ≥ 6 months (SD; n = 4). Patients treated on matched therapy (n = 16) compared with those on nonmatched therapy (n = 90) had improved SD ≥ 6 months/PR/CR (33% vs. 8%; P = 0.018) and longer progression-free survival (PFS; median, 6.4 vs. 1.9 months; P = 0.001). Eleven of 57 evaluable patients (19%) treated with combination chemotherapy and targeted therapy had SD ≥ 6 months/PR/CR versus 1 of 41 evaluable patients (2%) treated on other phase I trials (P = 0.013), and longer PFS (3.0 vs. 1.6 months; P &lt; 0.0001). Patients with molecular alterations in the PI3K/AKT/mTOR pathway treated on matched therapy (n = 16) had improved PFS compared with those with and without molecular alterations treated on nonmatched therapy (n = 27; 6.4 vs. 3.2 months; P = 0.036). On multivariate analysis, improved PFS was associated with treatment with combined chemotherapy and targeted agents (P = 0.0002), ≤ 2 metastatic sites (P = 0.003), therapy with PI3K/AKT/mTOR inhibitors for those with cognate pathway abnormalities (P = 0.018), and treatment with antiangiogenic agents (P = 0.023). In summary, combinations of chemotherapy and angiogenesis and/or PI3K/AKT/mTOR inhibitors demonstrated improved outcomes in patients with metastatic TNBC.

molecular cancer therapeutics

Triple-Negative Breast Cancer Patients Treated at MD Anderson Cancer Center in Phase I Trials: Improved Outcomes with Combination Chemotherapy and Targeted Agents