Key clinical point: Preliminary evidence indicated feasibility of LY2780301, a dual inhibitor of p70 ribosomal protein S6 kinase and protein kinase B (AKT) and paclitaxel combination in patients with hormone-resistant2 (HER2)-negative advanced breast cancer (BC).
Major finding: The recommended phase 2 dose was LY2780301 500 mg once daily + weekly paclitaxel 80 mg/m 2. The 6-month objective response rate for phase 2 was 63.9% (90% CI, 48.8-76.8) in the overall population and 55% (90% CI, 35.0-73.7) in phosphatidylinositol-3-kinase/AKT positive patients. The common drug-related adverse events were neuropathy, asthenia, ungual toxicity and pneumonitis.
Study details: Findings are from a prospective, multi-centred, phase 1b/2 TAKTIC trial including 48 patients with HER2-negative advanced BC with (phase 1B; n=12) or without (phase 2; n=36) previous cytotoxic treatment for advanced disease who were administered oral LY2780301 + intravenous paclitaxel.
Disclosures: This study was funded by the French National Cancer Institute, the Caritative Foundation and the Ligue Nationale Contre le Cancer. Three authors declared serving as advisory board member and/or receiving research grants and non-financial support from various pharmaceutical companies.
Source: Vicier C et al. Eur J Cancer. 2021 Nov 12. doi: 10.1016/j.ejca.2021.09.040.