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Updated: Jan 23, 2026
Porcine As a Training Module for Head and Neck Microvascular Reconstruction
Published on: September 29, 2018
Exploration of Therapeutic Targets Using CDK4 Inhibitors for Head and Neck Mucosal Melanoma
Takayoshi Hattori1, Makiko Fujii2, Tsutomu Ueda1
1Department of Otorhinolaryngology, Head and Neck Surgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan.
Objective:
Mucosal melanoma (MM) is an extremely aggressive malignant tumor in the head and neck region associated with a poor prognosis. In the present study, we conducted cell proliferation assay and western blotting using cell lines derived from MM and the immunohistochemical analysis of pathological MM tissues to identify novel therapeutic targets. Herein, we report on the potential of cyclin-dependent kinase 4 (CDK4) inhibitors as molecular targeted therapies for MM.
Study Design:
Retrospective cohort study and laboratory analysis.
Setting:
A tertiary referral center.
Methods:
MTT assay and western blotting were performed on the HMV-II (RCB0777) and GAK (JCRB0180) cell lines, treated with the CDK4 inhibitors abemaciclib (LY2835219) and palbociclib (PD-0332991). This retrospective cohort study included patients with head and neck MM; immunohistochemistry was performed on clinical specimens.
Results:
Abemaciclib and palbociclib showed concentration-dependent cytostatic effects on HMV-II and GAK cells at 72 hours in the MTT assay. In western blotting, they exhibited concentration-dependent inhibitory effects on phosphorylated RB1 in HMV-II and GAK cells at 24 hours. Of 23 patients, 18 (78.3%) had positive results on CDK4 immunostaining. No clinicopathologic factors were significantly associated with CDK4 status.
Conclusion:
Abemaciclib and palbociclib may suppress MM cell proliferation. The CDK4 signaling pathway is a potential target for molecular-targeted therapies in MM.
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