Cemiplimab in locally advanced basal cell carcinoma after hedgehog inhibitor therapy: an open-label, multi-centre, single-arm, phase 2 trial

Abstract

Background: Before February, 2021, there was no standard treatment regimen for locally advanced basal cell carcinoma after first-line hedgehog inhibitor (HHI) therapy. Cemiplimab, a PD-1 antibody, is approved for treatment of advanced cutaneous squamous cell carcinoma and has shown clinical activity as monotherapy in first-line non-small-cell lung cancer. Here, we present the primary analysis data of cemiplimab in patients with locally advanced basal cell carcinoma after HHI therapy.

Methods: We did an open-label, multicentre, single-arm, phase 2 trial across 38 outpatient clinics, primarily at academic medical centres, in Canada, Europe, and the USA. Eligible patients (aged ≥18 years and with an Eastern Cooperative Oncology Group performance status of 0 or 1) with a histologically confirmed diagnosis of metastatic basal cell carcinoma (group 1) or locally advanced basal cell carcinoma (group 2) who had progressed on or were intolerant to previous HHI therapy were enrolled. Patients were not candidates for further HHI therapy due to progression of disease on or intolerance to previous HHI therapy or having no better than stable disease after 9 months on HHI therapy. Patients received cemiplimab 350 mg intravenously every 3 weeks for up to 93 weeks or until progression or unacceptable toxicity. The primary endpoint was objective response by independent central review. Analyses were done as per the intention-to-treat principle. The safety analysis comprised all patients who received at least one dose of cemiplimab. The primary analysis is reported only for group 2; group 1 data have not reached maturity and will be reported when the timepoint, according to the statistical analysis plan, has been reached. This study is registered with ClinicalTrials.gov, NCT03132636, and is no longer recruiting new participants.

Findings: Between Nov 16, 2017, and Jan 7, 2019, 84 patients were enrolled and treated with cemiplimab. At data cutoff on Feb 17, 2020, median duration of follow-up was 15 months (IQR 8-18). An objective response per independent central review was observed in 26 (31%; 95% CI 21-42) of 84 patients, including two partial responses that emerged at tumour assessments before the data cutoff and were confirmed by tumour assessments done subsequent to the data cutoff. The best overall response was five (6%) patients with a complete response and 21 (25%) with a partial response. Grade 3-4 treatment-emergent adverse events occurred in 40 (48%) of 84 patients; the most common were hypertension (four [5%] of 84 patients) and colitis (four [5%]). Serious treatment-emergent adverse events occurred in 29 (35%) of 84 patients. There were no treatment-related deaths.

Interpretation: Cemiplimab exhibited clinically meaningful antitumour activity and an acceptable safety profile in patients with locally advanced basal cell carcinoma after HHI therapy.

Funding: Regeneron Pharmaceuticals and Sanofi.

Conflict of interest statement

Declaration of interests AJS reports advisory board or steering committee roles with Janssen, Regeneron Pharmaceuticals, Roche, and Sanofi; and research support from Abbvie, Bristol Myers Squibb, Genesis Pharma, and Novartis. AS reports advisory roles with Regeneron Pharmaceuticals and Roche. KP reports advisory board roles with Abbvie, LEO Pharma, Janssen, Almirall, Eli Lilly, Galderma, Novartis, Pierre Fabre, Sun Pharma, and Sanofi, outside the submitted work. OB has advisory board roles with Novartis, Bristol Myers Squibb, Merck Sharp & Dohme, Pierre Fabre, and Ultimovacs. KDL reports grants from the University of Colorado; and grants and personal fees from Regeneron Pharmaceuticals. ALSC reports advisory roles with Regeneron Pharmaceuticals and Merck; and research funding from Regeneron Pharmaceuticals, Merck, Novartis, and Galderma. SD reports that their spouse is an employee of Sanofi. LL reports institutional grants and personal fees from AstraZeneca, Bristol Myers Squibb, Boehringer Ingelheim, Debiopharm International SA, Eisai, Novartis, and Roche; institutional grants from Celgene International, Exelixis, Hoffmann-La Roche, IRX Therapeutics, Medpace, Merck-Serono, and Pfizer; and personal fees from Sobi, Ipsen, Incyte Biosciences Italy SRL, Doxa Pharma, Amgen, Nanobiotics SA, GlaxoSmithKline, AccMed, Medical Science Fundation G. Lorenzini, Associazione Sinapsi, Think 2 IT, Aiom Servizi, Prime Oncology, WMA Congress Education, Fasi, DueCi Promotion SRL, MI&T, Net Congress & Education, PRMA Consulting, Kura Oncology, Health & Life SRL, and Immuno-Oncology Hub. CR reports grants and personal fees advisory board roles with Bristol Myers Squibb, Pierre Fabre, Novartis, Amgen, Merck, Roche, Merck Sharp & Dohme, Sanofi, Biothera, and Ultimovacs. CU reports advisory board and speaker roles for Roche, Sanofi, Regeneron Pharmaceuticals, and Sun Pharma. AH reports institutional funding and personal fees from Amgen, Bristol Myers Squibb, Merck Serono, Merck Sharp & Dohme, Merck & Co, Philogen, Pierre Fabre, Provectus, Regeneron Pharmaceuticals, Roche, Sanofi Genzyme, and Novartis; and consultancy fees from OncoSec, Almirall Hermal, and Sun Pharma. MRM reports advisory roles with and travel fees from Regeneron Pharmaceuticals and Sun Pharmaceuticals; advisory role with Rakuten Medical; and research funding from Regeneron Pharmaceuticals and PellePharm. RD has intermittent, project focused consultant and advisory roles with Novartis, Merck Sharp & Dohme, Bristol Myers Squibb, Roche, Amgen, Takeda, Pierre Fabre, Sun Pharma, Sanofi, Catalym, Second Genome, Regeneron Pharmaceuticals, Alligator, MaxiVAX SA, and touchIME outside the submitted work. SL, S-YY, KM, EC, VJ, NF, EO, FS, DMW, and TB are employees and shareholders of Regeneron Pharmaceuticals. CL reports personal fees from Roche, Sun Pharma, Bristol Myers Squibb, Merck Sharp & Dohme, Merck, Novartis, Pierre Fabre, Kyowa Kirin, Almiral Hermal, and Biontech. ZE reports advisory board fees from Regeneron Pharmaceuticals, Novartis, Array, Genentech, and SunPharma; and grants from Novartis. RG reports documentation fees to institution from Regeneron Pharmaceuticals; personal fees and non-financial support from Amgen, Bristol Myers Squibb, Roche Pharma, Merck Serono, Pierre Fabre, Sanofi, and Regeneron Pharmaceuticals; grants, personal fees, and non-financial support from Novartis; grants and personal fees from Pfizer; grants from Johnson & Johnson; and personal fees from Merck Sharp & Dohme, Almirall Hermal, SUN Pharma, 4SC, and Bayer. JU reports grants and personal fees from Sanofi, Bristol Myers Squibb, Novartis, and Merck Sharp & Dohme; and personal fees from Roche, medac, and Sun Pharma. SPu reports personal fees and non-financial support from Sanofi; other (clinical trials) from Regeneron Pharmaceuticals; grants from Avene; non-financial support from Abbie; grants, personal fees, and non-financial support from ISDIN, La Roche-Posay, and Roche; grants and personal fees from Sun Pharma; non-financial support from Eli Lilly and Merck Sharp & Dohme; personal fees, non-financial support, and other (related to clinical trials) from Pfizer; grants, personal fees, and other from Leo Pharma and Almirall; personal fees and other (related to clinical trials) from Ojer Pharma; personal fees from Pierre Fabre; and non-financial support from MAVIG, FotoFinder, and 3Gen. GDY is an employee of, shareholder in, and a member of the Board of Directors at Regeneron Pharmaceuticals. GT is an employee of, patent holder, and shareholder of Regeneron Pharmaceuticals. IL and MGF are employees of, have patents pending, and are shareholders of Regeneron Pharmaceuticals. SPr, MK, NB-S, AFO, IB, and VDG declare no competing interests.

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