WEE Family Kinase Inhibitors Combined with Sorafenib Can Selectively Inhibit HCC Cell Proliferation.

Background: Sorafenib is currently the first choice for the treatment of patients with advanced hepatocellular carcinoma, but its therapeutic effect is still limited.

Objectives: This study aims to examine whether WEE family kinase inhibitors can enhance the anticancer effect of sorafenib.

Methods: We analyzed the expression levels of PKMYT1 kinase and WEE1 kinase in HCC, studied the inhibitory effect of PKMYT1 kinase inhibitor RP-6306, WEE1 kinase inhibitor adavosertib combined with sorafenib on the proliferation of HCC cells, and detected the effect of drug combination on CDK1 phosphorylation.

Results: We found that PKMYT1 and WEE1 were upregulated in HCC and were detrimental to patient survival. Cell experiments showed that both RP-6306 and adavosertib (1-100 μM) inhibited the proliferation of HCC cell lines in a dose-dependent manner alone, and the combination of the two drugs had a synergistic effect. In HCC cell lines, sorafenib combined with RP-6306 or adavosertib showed a synergistic antiproliferation effect and less toxicity to normal cells. Sorafenib combined with RP-6306 and adavosertib further inhibited the proliferation of HCC cells and caused complete dephosphorylation of CDK1.

Conclusion: Taken together, our findings provide experimental evidence for the future use of sorafenib in combination with RP-6306 or adavosertib for the treatment of HCC.