Alpelisib in combination with everolimus ± exemestane in solid tumours: Phase Ib randomised, open-label, multicentre study.

BACKGROUND AND PURPOSE

Combined mTORC1 inhibition with everolimus (EVE) and phosphatidylinositol 3-kinase catalytic subunit p110α blockade with alpelisib (ALP) has demonstrated synergistic efficacy in preclinical models and supports testing the combination of ALP and EVE in the clinical setting. The primary objective was to determine the maximum tolerated dose (MTD)/recommended dose for expansion (RDE) of ALP in combination with EVE and in combination with EVE and exemestane (EXE) and subsequently assess safety, preliminary efficacy and effect of ALP on the pharmacokinetics of EVE and determine the magnitude of the drug-drug interaction.

PATIENTS AND METHODS

Dose escalation phases were conducted in patients with advanced solid tumours and in postmenopausal women with hormone receptor-positive (HR+), human epidermal growth factor receptor 2-negative (HER2-) advanced breast cancer (ABC). The dose expansion phase was conducted in patients with pancreatic neuroendocrine tumour and renal cell carcinoma (RCC) (both mechanistic target of rapamycin inhibitor [mTORi]-naive), in patients with mTORi-pretreated solid tumours and in postmenopausal women with HR+, HER2- ABC.

RESULTS

During the doublet escalation phase, dose-limiting toxicities (DLTs) were reported in 5 of 10 (50%) patients: one patient had grade (Gr) 2 hyperglycemia and one patient had Gr 3 diarrhoea in the 300 mg dose group, one patient had Gr 2 hyperglycemia and one patient had Gr 4 hypocalcaemia in the 250 mg dose group, and one patient in the 200 mg dose group had Gr 3 diarrhoea and Gr 3 stomatitis. The combination of ALP 250 mg + EVE 2.5 mg was declared as the MTD/RDE in subjects with advanced solid tumours. In the triplet escalation phase, one patient who received ALP 200 mg + EVE 2.5 mg + EXE 25 mg had a DLT of Gr 3 acute kidney injury. This dose combination was declared as the MTD and RDE in subjects with advanced HR-positive HER2-negative BC. The common adverse events (≥30% patients), occurring across all phases, were hyperglycaemia, stomatitis, diarrhoea, nausea, asthenia, decreased appetite and fatigue. The sixteen-week progression-free survival rate was 52.4% (90% confidence interval [CI]: 32.8, 71.4) in the RCC cohort, 35.3% (90% CI: 16.6, 58.0) in the prior pNET cohort and 30.0% (90% CI: 8.7, 60.7) in the prior mTORi cohort. The pharmacokinetics of 2.5 mg of EVE was largely unchanged in the presence of ALP, independent of the dose (250 mg or 300 mg). There were no clinically relevant drug-drug interactions observed between ALP and EVE.

CONCLUSION

The overall safety profile of ALP with EVE and EXE is manageable and reversible; no unexpected safety signals were noted compared with the individual safety profiles. Pharmacokinetics of ALP, EVE and EXE was largely unchanged in combination with each other.

Informations de copyright

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Déclaration de conflit d'intérêts

Conflict of interest statement G.C. reports personal fees from Pfizer, personal fees from Novartis, personal fees from Lilly, personal fees from Seagen, personal fees from Amgen, personal fees from Roche, personal fees from AstraZeneca and personal fees from Daiichi Sankyo, outside the submitted work. M.M. reports personal fees from AstraZeneca, grants and personal fees from Roche, personal fees from Lilly, grants and personal fees from Puma, grants and personal fees from Novartis, personal fees from Taiho Oncology, personal fees from Pfizer, personal fees from PharmaMar and personal fees from Daiichi Sankyo, outside the submitted work. K.J. reports grants and personal fees from Novartis, personal fees from Spectrum Pharmaceuticals, grants and personal fees from ADC Therapeutics, grants and personal fees from Pfizer, personal fees from Bristol Myers Squibb, personal fees from Jounce Therapeutics, personal fees from Taiho Oncology, grants and personal fees from Genentech, personal fees from Synthon, personal fees from AbbVie, personal fees from Eisai, grants from Clovis Oncology, grants from AstraZeneca, grants from Novita Pharmaceuticals, grants from Debiopharm, grants from Lilly, grants from Zymeworks, grants from Immunomedics and grants from Puma Biotechnology, outside the submitted work. J.T.B. reports grants from AbbVie, grants from Alliance, grants from Amgen, grants from Ascentage Pharma Group, grants from AstraZeneca, grants from Bayer, grants from Boston Biomedical, grants from Bristol Myers Squibb, grants from Celgene, grants from Eli Lilly, grants from Genentech-Roche, grants from Hutchison, grants from Immunomedics, grants from Janssen, grants from MT Group, grants from Nektar, grants from Pfizer, grants from Polynoma, grants from Seattle Genetics, grants from EMD Serono, grants from Tesaro, grants from TG Therapeutics, grants from Biodesix and grants from Exact Sciences, during the conduct of the study. G.T. declared no conflict of interest. N.F. reports honoraria from Novartis, Ipsen, Merck, Sanofi-Aventis and Advanced Accelerator Applications; consulting or advisory role in Novartis/Ipsen, Advanced Accelerator Applications, Pfizer, Ipsen, Merck Serono, MSD Oncology and Wren Laboratories, Europe; research funding from Novartis (Inst), Merck Serono (Inst), Ipsen (Inst) and MSD (Inst) and other relationship with Springer and II Pensiero Scientifico Editore. M.M. and R.A.H. declared no conflict of interest. H.L. reports grants, personal fees and non-financial support from Novartis, personal fees and non-financial support from Ipsen and personal fees and non-financial support from Pfizer, during the conduct of the study. V.D. is a Novartis employee and declared no conflict of interest. O.A. is a Novartis employee and declared no conflict of interest. Z.L. is a Novartis employee and declared no conflict of interest. L.B. is a Novartis employee and declared no conflict of interest. F.A. reports grants from Novartis, during the conduct of the study, grants from Pfizer, grants from Roche, grants from Daiichi, grants from Eli Lilly and grants from Astra Zeneca, outside the submitted work.