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Reversibility of regorafenib effects in hepatocellular carcinoma cells.

ABSTRACT: Multikinase growth inhibitors inhibit their target kinases with varying potency. Patients often require lower doses or therapy breaks due to drug toxicities. To evaluate the effects of drug withdrawal on hepatocellular carcinoma cells after incubation with growth-inhibitory concentrations of regorafenib, cell growth, migration and invasion, and signaling were examined.Cell proliferation, motility, and invasion were analyzed by MTT, wound healing, and invasion assays, respectively, and MAPK pathway protein markers were analyzed by Western blot.After regorafenib removal, cell growth, migration, and invasion recovered. Repeated drug exposure resulted in changes in cell growth patterns. Recovery could be blocked by sub-growth-inhibitory concentrations of either doxorubicin or vitamin K1. Recovery of growth was associated with increased phospho-JNK, phospho-p38, and phospho-STAT3 levels. The recovery of growth, migration, and signaling were blocked by a JNK inhibitor.Removal of regorafenib from growth-inhibited cells resulted in a JNK-dependent recovery of growth and migration.

SUBMITTER: D'Alessandro R

PROVIDER: S-EPMC3836575 | biostudies-literature | 2013 Oct

REPOSITORIES: biostudies-literature

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Reversibility of regorafenib effects in hepatocellular carcinoma cells.

D'Alessandro Rosalba R Refolo Maria G MG Lippolis Catia C Messa Caterina C Cavallini Aldo A Rossi Roberta R Resta Leonardo L Di Carlo Antonio A Carr Brian I BI

Cancer chemotherapy and pharmacology 20131001 4

<h4>Purpose</h4>Multikinase growth inhibitors inhibit their target kinases with varying potency. Patients often require lower doses or therapy breaks due to drug toxicities. To evaluate the effects of drug withdrawal on hepatocellular carcinoma cells after incubation with growth-inhibitory concentrations of regorafenib, cell growth, migration and invasion, and signaling were examined.<h4>Methods</h4>Cell proliferation, motility, and invasion were analyzed by MTT, wound healing, and invasion assa ...[more]

PMID: 23959464

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Project description:BackgroundNo trials have compared cabozantinib and regorafenib for the second-line treatment of advanced hepatocellular carcinoma (HCC).ObjectivesConduct a matching-adjusted indirect comparison (MAIC) of the efficacy and safety of second-line cabozantinib and regorafenib in patients with advanced HCC and disease progression after prior sorafenib.MethodsThe CELESTIAL and RESORCE trials were used for indirect comparison of second-line cabozantinib and regorafenib in advanced HCC. Population-level data were available for RESORCE, individual patient data (IPD) for CELESTIAL. To align with RESORCE, the CELESTIAL population was limited to patients who received first-line sorafenib only. To minimize potential effect-modifying population differences, the CELESTIAL IPD were weighted to balance the distribution of clinically relevant baseline characteristics with those of RESORCE. Overall survival (OS) and progression-free survival (PFS) were evaluated for the matching-adjusted second-line CELESTIAL population and compared with those for RESORCE using weighted Kaplan-Meier curves and parametric modeling. Rates of grade 3/4 treatment-emergent adverse events (TEAEs) affecting > 5% of patients in any study arm were compared.ResultsIn the matching-adjusted second-line populations (CELESTIAL, effective sample size = 266; RESORCE, n = 573), median (95% confidence interval) OS was similar for cabozantinib and regorafenib (11.4 [8.9-17.0] versus 10.6 [9.1-12.1] months; p = 0.3474, log-rank test). Median PFS was longer for cabozantinib than regorafenib (5.6 [4.9-7.3] versus 3.1 [2.8-4.2] months; p = 0.0005, log-rank test). There was a trend for lower rates of some grade 3/4 TEAEs with regorafenib than with cabozantinib, which may reflect the exclusion of sorafenib-intolerant patients from RESORCE but not from CELESTIAL, a difference that the MAIC methods could not remove. Only diarrhea rates were statistically significantly lower for regorafenib (p ≤ 0.001).ConclusionsCabozantinib may achieve similar OS and prolonged PFS compared with regorafenib in patients with progressive advanced HCC after prior sorafenib.

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Reversibility of regorafenib effects in hepatocellular carcinoma cells.

Publications

Reversibility of regorafenib effects in hepatocellular carcinoma cells.

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