Mai Nakahara

Dr. Mai Nakahara

orcid

Research Focus & Metrics

Academic Career Length

9Years (2018-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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Verified
Journal Article
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TMTakanori Matsui
Takanori Matsui
TCTaiga Chiyo
Taiga Chiyo
Hideki KobaraHideki Kobara
Hideki Kobara
Shintaro FujiharaShintaro Fujihara
Shintaro Fujihara
KFKoji Fujita
Koji Fujita
TMTsutomu Masaki
Tsutomu Masaki
Esophageal squamous cell carcinoma (ESCC) is the most common primary esophageal malignancy. Telmisartan, an angiotensin II type 1 (AT1) receptor blocker (ARB) and a widely used antihypertensive, has been shown to inhibit proliferation of various cancer types. This study evaluated the effects of telmisartan on human ESCC cell proliferation in vitro and in vivo and sought to identify the microRNAs (miRNAs) involved in these antitumor effects. We examined the effects of telmisartan on three human ESCC cell lines (KYSE150, KYSE180, and KYSE850). Telmisartan inhibited proliferation of these three cell lines by inducing S-phase arrest, which was accompanied by decreased expression of cyclin A2, cyclin-dependent kinase 2, and other cell cycle-related proteins. Additionally, telmisartan reduced levels of phosphorylated ErbB3 and thrombospondin-1 in KYSE180 cells. Furthermore, expression of miRNAs was remarkably altered by telmisartan in vitro. Telmisartan also inhibited tumor growth in vivo in a xenograft mouse model. In conclusion, telmisartan inhibited cell proliferation and tumor growth in ESCC cells by inducing cell-cycle arrest.

Verified
Journal Article
Open access
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TSTingting Shi
Tingting Shi
HIHisakazu Iwama
Hisakazu Iwama
KFKoji Fujita
Koji Fujita
Hideki KobaraHideki Kobara
Hideki Kobara
典西典子 西山
典子 西山
TMTsutomu Masaki
Tsutomu Masaki
Hepatocellular carcinoma (HCC) is one of the major causes of cancer-related deaths worldwide. Sorafenib has been used as a first-line systemic treatment for over a decade. However, resistance to sorafenib limits patient response and presents a major hurdle during HCC treatment. Lenvatinib has been approved as a first-line systemic treatment for advanced HCC and is the first agent to achieve non-inferiority against sorafenib. Therefore, in the present study, we evaluated the inhibition efficacy of lenvatinib in sorafenib-resistant HCC cells. Only a few studies have been conducted on this topic. Two human HCC cell lines, Huh-7 and Hep-3B, were used to establish sorafenib resistance, and in vitro and in vivo studies were employed. Lenvatinib suppressed sorafenib-resistant HCC cell proliferation mainly by inducing G1 cell cycle arrest through ERK signaling. Hep-3B sorafenib-resistant cells showed partial cross-resistance to lenvatinib, possibly due to the contribution of poor autophagic responsiveness. Overall, the findings suggest that the underlying mechanism of lenvatinib in overcoming sorafenib resistance in HCC involves FGFR4-ERK signaling. Lenvatinib may be a suitable second-line therapy for unresectable HCC patients who have developed sorafenib resistance and express FGFR4.

26 March 2023 in Diagnostics
Verified
Journal Article
Open access
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TMTakushi Manabe
Takushi Manabe
COChikara Ogawa
Chikara Ogawa
KTKei Takuma
Kei Takuma
MNMai Nakahara
Mai Nakahara
KOKyoko Oura
Kyoko Oura
TMTsutomu Masaki
Tsutomu Masaki
Computed tomography (CT) is often used in the diagnosis of sarcopenia. In this study, we validated the assessment of sarcopenia by the psoas muscle volume using versatile software. The study involved a retrospective analysis of data from 190 patients with liver disease who underwent grip-strength testing and abdominal pelvic computed tomography. To assess sarcopenia, SYNAPSE 3D was used to obtain the skeletal muscle index, the psoas muscle index (PMI), and the simple method. We also used the recently proposed PMI cutoff values, for which the usefulness has been evaluated (O-PMI). The cutoff value of the psoas muscle volume index (PMVI) was determined using one of the diagnostic methods as the gold standard. All diagnostic methods showed that patients with sarcopenia had shorter survival, with O-PMI having the highest hazard ratio (HR) (HR, 6.12; 95% confidence interval [CI], 2.6–14.41; p < 0.001). Even when sarcopenia could not be diagnosed by O-PMI, low PMVI was associated with shorter survival (HR, 3.53; 95% CI, 1.34–9.32; p = 0.01). PMVI may be useful in the evaluation of sarcopenia, including the identification of poor overall survival in cases that cannot be diagnosed by O-PMI, which is considered more useful than PMI.

Verified
Journal Article
Open access
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TTTomoko Tadokoro
Tomoko Tadokoro
KOKyoko Oura
Kyoko Oura
MNMai Nakahara
Mai Nakahara
KFKoji Fujita
Koji Fujita
JTJoji Tani
Joji Tani
Hideki KobaraHideki Kobara
Hideki Kobara
Alcohol-associated liver disease (ALD) is a major cause of liver-related mortality worldwide; however, only a subset of heavy drinkers develop progressive disease, suggesting a role for host genetics. In East Asian populations, functional polymorphisms in alcohol-metabolizing enzymes, such as alcohol dehydrogenase 1B (ADH1B) and aldehyde dehydrogenase 2 (ALDH2), are common and significantly affect acetaldehyde metabolism. ADH1B accelerates ethanol oxidation, whereas ALDH2 impairs acetaldehyde detoxification and increases oxidative stress, inflammation, and liver injury. Based on genotype combinations, individuals were stratified into five alcohol sensitivity groups with differing risks of cirrhosis and cancer. Although ALDH2 deficiency often suppresses alcohol intake via aversive reactions, paradoxically, continued drinking increases the risk of liver and gastrointestinal cancers. Genetic risk stratification may inform personalized prevention and precision of public health approaches. However, expansion of direct-to-consumer genetic testing has raised ethical and educational challenges. Understanding the interaction between alcohol metabolism and genetic variations is crucial for identifying high-risk individuals and guiding tailored interventions in East Asian populations.

19 June 2023 in Cancers
Verified
Journal Article
Open access
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KOKyoko Oura
Kyoko Oura
AMAsahiro Morishita
Asahiro Morishita
TMTakushi Manabe
Takushi Manabe
KTKei Takuma
Kei Takuma
MNMai Nakahara
Mai Nakahara
TMTsutomu Masaki
Tsutomu Masaki
Although there have been advances in the prevention and diagnosis of hepatocellular carcinoma (HCC) in recent years, many HCC patients are still diagnosed with advanced stage. Systemic therapy is indicated for unresectable HCC (uHCC) with major vascular invasion and/or extrahepatic metastases, and the atezolizumab plus bevacizumab (atezo/bev) combination is currently recommended as first-line treatment for uHCC. Recently, sarcopenia-related factors, including decreased skeletal muscle index (SMI), have been reportedly associated with prognosis in uHCC patients treated with sorafenib or lenvatinib. There are few reports on muscle strength assessments, including grip strength (GS), despite their importance in accurate sarcopenia diagnosis, and furthermore, there is no evidence regarding atezo/bev therapy. In this study, we investigated whether sarcopenia affects the clinical outcome of atezo/bev therapy. This study included 64 uHCC patients on atezo/bev therapy and assessed their GS and SMI, and SMI was measured using bioelectrical impedance analysis (BIA). We diagnosed sarcopenia based on GS and BIA-SMI and compared the clinical outcomes in the sarcopenia and non-sarcopenia groups. Of these patients, 28 had sarcopenia, and 36 had non-sarcopenia. Adverse events (AEs) frequently occurred, and the albumin-bilirubin score significantly decreased after atezo/bev therapy in the sarcopenia group than in the non-sarcopenia group. The median progression-free survival was 4.7 (0.4–26.4) and 10.6 (1.1–24.5) months in the sarcopenia and non-sarcopenia groups, respectively. The median overall survival (OS) was 12.6 (1.4–27.7) months in the sarcopenia group and was not reached in the non-sarcopenia group, indicating a significant difference in the Kaplan-Meier survival curves for both groups (p < 0.01). In multivariate analysis, sarcopenia was significantly associated with OS. In conclusion, sarcopenia was significantly associated with poor clinical outcomes based on the occurrence of AEs and decreased liver function in uHCC patients on atezo/bev therapy. GS and SMI are important parameters for accurately diagnosing sarcopenia.

12 February 2026 in Cancers
Verified
Journal Article
Open access
PDF file
AMAsahiro Morishita
Asahiro Morishita
KOKyoko Oura
Kyoko Oura
HTHiroki Tai
Hiroki Tai
RYRie Yano
Rie Yano
MNMai Nakahara
Mai Nakahara
Hideki KobaraHideki Kobara
Hideki Kobara
Hepatocellular carcinoma (HCC) is the most common primary liver cancer and a major cause of cancer mortality worldwide. Because HCC usually arises in cirrhotic livers, prognosis is shaped by the dual threats of tumor progression and hepatic decompensation, requiring treatment decisions that balance anticancer efficacy with preservation of liver function, portal hypertension control, and quality of life. In recent years, management has shifted from a predominantly locoregional approach to an integrated continuum that spans curative resection, ablation, and transplantation; refined transarterial and radiotherapy techniques; and modern systemic therapy dominated by immunotherapy-based combinations. These advances have improved response rates, enabled downstaging and conversion in selected patients, and expanded opportunities for sequential and multimodal treatment. However, challenges persist, including therapeutic decision-making in patients with Child–Pugh B liver function, lack of robust predictive biomarkers, and resistance after initial response. Emerging tools—liquid biopsy, radiomics, AI-assisted imaging, and microbiome modulation—may support future precision strategies and optimized treatment allocation. In this review, we summarize current evidence guiding staging and therapy selection, outline practical considerations across curative, locoregional, and systemic modalities, and discuss evolving biomarkers and next-generation immunotherapy as key steps toward more personalized, durable, and equitable global HCC care.