Tipifarnib in Head and Neck Squamous Cell Carcinoma With HRAS Mutations.

Purpose: Mutations in the HRAS (m HRAS ) proto-oncogene occur in 4%-8% of patients with recurrent and/or metastatic (R/M) head and neck squamous cell carcinoma (HNSCC). Tipifarnib is a farnesyltransferase inhibitor that disrupts HRAS function. We evaluated the efficacy of tipifarnib in patients with R/M m HRAS HNSCC.
Methods: We enrolled 30 patients with R/M HNSCC in a single-arm, open-label phase II trial of tipifarnib for m HRAS malignancies; one additional patient was treated on an expanded access program. After an ad hoc analysis of the first 16 patients with HNSCC with m HRAS variant allele frequency (VAF) data, enrollment was limited to those with a m HRAS VAF of ≥ 20% (high VAF). The primary end point was objective response rate. Secondary end points included assessing safety and tolerability. Patients received tipifarnib 600 or 900 mg orally twice daily on days 1-7 and 15-21 of 28-day cycles.
Results: Of the 22 patients with HNSCC with high VAF, 20 were evaluable for response at the time of data cutoff. Objective response rate for evaluable patients with high-VAF HNSCC was 55% (95% CI, 31.5 to 76.9). Median progression-free survival on tipifarnib was 5.6 months (95% CI, 3.6 to 16.4) versus 3.6 months (95% CI, 1.3 to 5.2) on last prior therapy. Median overall survival was 15.4 months (95% CI, 7.0 to 29.7). The most frequent treatment-emergent adverse events among the 30 patients with HNSCC were anemia (37%) and lymphopenia (13%).
Conclusion: Tipifarnib demonstrated encouraging efficacy in patients with R/M HNSCC with HRAS mutations for whom limited therapeutic options exist (NCT02383927).
Competing Interests: Alan L. HoConsulting or Advisory Role: Bristol-Myers Squibb, Eisai, Genzyme, Merck, Novartis, Sun Pharma, Regeneron, TRM Oncology, Ayala Pharmaceuticals, AstraZeneca, Sanofi, CureVac, Prelude Therapeutics, Kura Oncology, McGivney Global Advisors, Rgenta, Exelixis, Genentech/Roche, AffyimmuneSpeakers' Bureau: Medscape, Omniprex America, NovartisResearch Funding: Lilly, Genentech/Roche, AstraZeneca, Bayer, Kura Oncology, Kolltan Pharmaceuticals, Eisai, Bristol-Myers Squibb, Astellas Pharma, Novartis, Merck, Pfizer, Ayala Pharmaceuticals, Allos Therapeutics, Daiichi Sankyo, Elevar TherapeuticsTravel, Accommodations, Expenses: Janssen Oncology, Merck, Kura Oncology, Ignyta, Ayala Pharmaceuticals, Klus Pharma Irene BranaConsulting or Advisory Role: Merck Sharp and Dohme, Rakuten Medical, Sanofi, Achilles Therapeutics, eTheRNA Immunotherapies, Cancer Expert NowSpeakers' Bureau: Bristol-Myers Squibb, Merck Serono, RocheResearch Funding: AstraZeneca, Bristol-Myers Squibb, Celgene, Gliknik, GlaxoSmithKline, Janssen Oncology, Kura Oncology, Merck Sharp and Dohme, Novartis, Orion Pharma GmbH, Pfizer, Roche, Shattuck Labs, Nanobiotix, Seattle GeneticsTravel, Accommodations, Expenses: AstraZeneca Spain, Merck Serono Robert HaddadEmployment: Dana-Farber Cancer InstituteLeadership: NCCNConsulting or Advisory Role: Celgene, Merck, Eisai, Bristol-Myers Squibb, AstraZeneca, Pfizer, Loxo, Genentech, Immunomic Therapeutics, GlaxoSmithKline, Gilead Sciences, Vaccinex, EMD Serono, BioNTech AG, Achilles TherapeuticsResearch Funding: Boehringer Ingelheim, Merck, Bristol-Myers Squibb, Celgene, AstraZeneca, VentiRx, Genentech, Pfizer, Kura OncologyPatents, Royalties, Other Intellectual Property: UpToDateOther Relationship: Nanobiotix, ISA Pharmaceuticals Jessica BaumanConsulting or Advisory Role: Pfizer, Bayer, AstraZeneca, Kura OncologyResearch Funding: Bristol-Myers SquibbTravel, Accommodations, Expenses: Trident Pharmaceuticals Sjoukje OostingResearch Funding: Celldex Deborah J. WongConsulting or Advisory Role: Bristol-Myers Squibb, Genentech/Roche, Sanofi/Aventis, Blueprint MedicinesResearch Funding: BioMed Valley Discoveries, Merck Serono, Merck Sharp and Dohme, ARMO BioSciences, AstraZeneca/MedImmune, Kura Oncology, Regeneron, Genentech/Roche, Bristol-Myers Squibb, FSTAR, Pfizer, Astellas Pharma, Enzychem Lifesciences, Lilly, Elevar Therapeutics Myung-Ju AhnHonoraria: AstraZeneca, Lilly, MSD, TAKEDAConsulting or Advisory Role: AstraZeneca, Boehringer Ingelheim, Lilly, MSD, TAKEDA, Alpha pharmaceutical Caroline EvenConsulting or Advisory Role: Innate Pharma, Bristol-Myers Squibb, MSD Oncology, Merck Serono Jerome FayetteHonoraria: AstraZeneca, Bristol-Myers Squibb, Merck Sharp and Dohme, Merck Serono, Innate Pharma, RocheConsulting or Advisory Role: AstraZeneca, Bristol-Myers Squibb, Merck Sharp and Dohme, Merck Serono, Innate Pharma, RocheResearch Funding: Bristol-Myers SquibbTravel, Accommodations, Expenses: Bristol-Myers Squibb, AstraZeneca, Merck Sharp and Dohme Kevin HarringtonHonoraria: Merck Sharp and Dohme, Amgen, Merck Serono, AstraZeneca/MedImmune, Boehringer Ingelheim, Bristol-Myers Squibb, Pfizer, Replimune, Oncolys BioPharma, MersanaConsulting or Advisory Role: Merck Sharp and Dohme, Merck Serono, AstraZeneca/MedImmune, Boehringer Ingelheim, Bristol-Myers Squibb, Pfizer, ReplimuneSpeakers' Bureau: Merck Sharp and Dohme, Merck Serono, Bristol-Myers SquibbResearch Funding: AstraZeneca, Merck Sharp and Dohme, Boehringer Ingelheim, Replimune Sung-Bae KimHonoraria: DAEHWA Pharmaceutical, ISU ABXISConsulting or Advisory Role: Lilly, AstraZeneca, DAEHWA Pharmaceutical, ISU AbxisResearch Funding: Novartis, Dongkook Pharma, Genzyme Lisa LicitraConsulting or Advisory Role: Eisai, Boehringer Ingelheim, AstraZeneca, SOBI, Novartis, Bayer, MSD, Merck Serono, Roche, Bristol-Myers Squibb, Incyte, Doxapharma, GlaxoSmithKline, Nanobiotix, Debiopharm Group, Amgen, IpsenResearch Funding: AstraZeneca, Novartis, Roche, MSD, Eisai, Merck Serono, Bristol-Myers Squibb, Boehringer Ingelheim, Celgene, Exelixis, IRX Therapeutics, Medpace, Pfizer, Debiopharm Group, RocheTravel, Accommodations, Expenses: Merck Serono, Bayer, Bristol-Myers Squibb, MSD, Eisai, AstraZeneca Nabil F. SabaHonoraria: Merck, Lilly, Pfizer, Bristol-Myers Squibb, CUE Biopharma, GlaxoSmithKline, Aduro Biotech, Kura Oncology, Genentech/RocheConsulting or Advisory Role: Pfizer, Bristol-Myers Squibb, Merck, Lilly, Bluprint, BiontechResearch Funding: Bristol-Myers Squibb, ExelixisTravel, Accommodations, Expenses: Bristol-Myers Squibb, Merck, Pfizer, Lilly, GlaxoSmithKline, Genentech/Roche, Bluprint Francis WordenHonoraria: Merck Sharp & Dohme, Eisai, Bristol-Myers Squibb, Bayer, RegeneronConsulting or Advisory Role: Merck, Loxo, Bristol-Myers Squibb, Eisai, Bayer, CUE Biopharma, Rakuten Medical, RegeneronResearch Funding: Pfizer, Merck, Eisai, Bristol-Myers Squibb, Loxo, Oragenics, LillyTravel, Accommodations, Expenses: Merck Sharp & Dohme, Bayer Binaifer BalsaraEmployment: Kura OncologyStock and Other Ownership Interests: Kura Oncology Mollie LeoniEmployment: Kura Oncology, Kyowa Kirin InternationalStock and Other Ownership Interests: Kura OncologyTravel, Accommodations, Expenses: Kura Oncology, Kyowa Kirin International Catherine ScholzEmployment: Kura Oncology, H3 BiomedicineStock and Other Ownership Interests: Kura OncologyPatents, Royalties, Other Intellectual Property: Methods of Treating Cancer Patients With Farnesyltransferase Inhibitors (FTI treatment of H-Ras mutant cancers), co-Inventor (014168-0011-999), Methods of Treating Cancer With Farnesyltransferase Inhibitors (FTI treatment of a CXCL12-expressing cancer), co-Inventor (014168-0021-999), Methods of Treating Cancer Patients With Farnesyltransferase Inhibitors (FTI treatment of Casitas B cell lymphoma [CBL] mutant cancers), co-Inventor (014168-0024-228), Therapies For Squamous Cell Carcinomas (FTI treatment of SCC with high frequencies of H-Ras mutant allele frequency), co-Inventor (014168-0051-888)Travel, Accommodations, Expenses: Kura OncologyNo other potential conflicts of interest were reported.