Tatsuki Ichikawa

Dr. Tatsuki Ichikawa


Research Focus & Metrics

Academic Career Length

25Years (2002-Present)

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

Representative Publications

View All Publications
6 February 2022 in Cancers
Verified
Journal Article
Open access
PDF file
RSRyu Sasaki
Ryu Sasaki
KNKazuyoshi Nagata
Kazuyoshi Nagata
MFMasanori Fukushima
Masanori Fukushima
MHMasafumi Haraguchi
Masafumi Haraguchi
SMSatoshi Miuma
Satoshi Miuma
KNKazuhiko Nakao
Kazuhiko Nakao
Background: Atezolizumab plus bevacizumab therapy has high response rates in patients with unresectable hepatocellular carcinoma (HCC). The hepatobiliary phase of gadoxetic acid-enhanced magnetic resonance imaging (EOB-MRI) has been reported to be useful as an imaging biomarker for detecting β-catenin mutations. We evaluated whether the pretreatment of the hepatobiliary phase of EOB-MRI could predict the therapeutic effect of lenvatinib and atezolizumab plus bevacizumab. Methods: This study included 68 patients (lenvatinib group (n = 33) and atezolizumab plus bevacizumab group (n = 35)). The visual assessment and relative enhancement ratio (RER) of the largest HCC lesions were evaluated using the hepatobiliary phase of EOB-MRI. Results: The hyperintensity type (RER ≥ 0.9) was 18.2% in the lenvatinib group and 20.0% in the atezolizumab plus bevacizumab group. In the lenvatinib group, progression-free survival (PFS) was not different between the heterogeneous and homogenous types (p = 0.688) or between the hyperintensity and hypointensity types (p = 0.757). In the atezolizumab plus bevacizumab group, the heterogeneous type had significantly shorter PFS than the homogenous type (p = 0.007), and the hyperintensity type had significantly shorter PFS than the hypointensity type (p = 0.012). Conclusions: The hepatobiliary phase of EOB-MRI was useful for predicting the therapeutic effect of atezolizumab plus bevacizumab therapy on unresectable HCC.

1 May 2019 in Internal Medicine
Verified
Journal Article
Open access
TITatsuki Ichikawa
Tatsuki Ichikawa
HMHisamitsu Miyaaki
Hisamitsu Miyaaki
SMSatoshi Miuma
Satoshi Miuma
YMYasuhide Motoyoshi
Yasuhide Motoyoshi
SNSyouhei Narita
Syouhei Narita
KNKazuhiko Nakao
Kazuhiko Nakao
Objective Direct-acting antivirals (DAAs) for treating hepatitis C virus (HCV) infection exert a significantly high sustained viral response (SVR), and patients experience a rebound increase in low-density lipoprotein cholesterol (LDL) and total cholesterol levels. Carotid intima-media thickness (IMT) is a highly reproducible and non-invasive parameter for assessing the atherosclerotic process, and the small dense (sd) LDL level is useful for clinically evaluating the atherogenic risk. Methods A total of 48 patients with chronic HCV infection were treated with DAAs. All patients exhibited an SVR 24 weeks later. We compared the metabolic profiles of the patients, including the sdLDL and IMT values, at the start of DAA treatment with those after one year of treatment. We verified whether the HCV clearance after the administration of DAAs is associated with the development of atherosclerosis. Results The sdLDL, %sdLDL (sdLDL/LDL), and LDL values were exacerbated after a year of treatment; however, the triglyceride level, glycated hemoglobin level, insulin resistance, and body weight remained unaltered. The max-IMT was increased after a year compared to that at the start of treatment. Differences in the max-IMT (dmax-IMT) were greater in men than in women; however, no correlation was observed between the dmax-IMT and genotype, fibrosis, hypertension, hyperlipidemia, diabetes, obesity, and dialysis status. The %sdLDL at the start and a year later was positively correlated with the dmax-IMT. No correlation was observed among various factors including the LDL, triglyceride, body mass index, insulin resistance and dmaxIMT. In uni-and multivariate analyses, a significant correlation was observed between %sdLDL >= 16%at the start of treatment and the sex and dmax-IMT. Conclusion Because the sdLDL and IMT values were exacerbated after a year of DAA treatment, atherosclerosis must be evaluated in patients achieving an SVR.

13 June 2016 in Biomedical Reports
Verified
Journal Article
Closed access
PDF file
EYEmi Yoshimura
Emi Yoshimura
TITatsuki Ichikawa
Tatsuki Ichikawa
HMHisamitsu Miyaaki
Hisamitsu Miyaaki
NTNaota Taura
Naota Taura
SMSatoshi Miuma
Satoshi Miuma
KNKazuhiko Nakao
Kazuhiko Nakao
The diagnosis of minimal hepatic encephalopathy (MHE) is more difficult in comparison to the diagnosis of overt hepatic encephalopathy (OHE), as patients with MHE do not exhibit overt neurological deficits and must be diagnosed using specialized equipment. However, identifying MHE is critical for patients with cirrhosis, and a simple screening test is required. The present study aimed to evaluate the associations between MHE, clinical characteristics and questionnaire items regarding sleep disturbances and cirrhosis-related symptom score (CSS). A total of 91 patients who had cirrhosis without OHE were evaluated using various questionnaires [i.e., CSS, Epworth Sleepiness Scale, the Japanese version of the Pittsburgh Sleep Quality Index (PSQI) and the Japanese 36-item short-form health survey (SF-36)]. MHE was diagnosed using the neuropsychological test. MHE was associated with severe liver damage, which was indicated by liver damage markers and a history of OHE. In addition, MHE was associated with the CSS, PSQI and SF-36 results. The multivariate analyses revealed that a history of OHE was the factor that was the most strongly associated with MHE. Among patients without a history of OHE, MHE was most strongly associated with CSS, although it was also associated with severe liver damage and platelet counts. A prediction score (calculated using a history of OHE and CSS) provided an area under the receiver operating characteristic curve of 0.738 and a sensitivity of 0.671 for identifying MHE. In conclusion, a history of OHE and CSS may be useful for identifying MHE in patients with cirrhosis.

17 September 2012 in Experimental and Therapeutic Medicine
Verified
Journal Article
Open access
PDF file
NTNaota Taura
Naota Taura
SFSachiko Fukuda
Sachiko Fukuda
TITatsuki Ichikawa
Tatsuki Ichikawa
HMHisamitsu Miyaaki
Hisamitsu Miyaaki
HSHidetaka Shibata
Hidetaka Shibata
KNKazuhiko Nakao
Kazuhiko Nakao
α‑fetoprotein (AFP) is a tumor marker of hepatocellular carcinoma (HCC) and has also been reported to reflect the effectiveness of long‑term low‑dose interferon (IFN) therapy in hepatitis C virus (HCV)‑infected patients with chronic liver disease. The correlation between AFP levels and the incidence of HCC has been discussed over a long period. We investigated whether high levels of AFP at the time of diagnosis were associated with an increased incidence of HCC in patients with HCV. A total of 107 HCV patients with liver cirrhosis without other risks were evaluated for the predictive value of non‑invasive risk factors for HCC, including age, gender, alcohol intake, aspartate and alanine aminotransferase levels, bilirubin, albumin, platelet count and AFP levels at study entry, as well as the IFN therapy received. During the follow‑up period, HCC developed in 68 (63.6%) patients. Kaplan‑Meier estimates were made to assess the cumulative risk of HCC. The 10‑year cumulative incidence rate of HCC was 80%. Cox regression analysis was performed on several variables, including age, gender, alcohol consumption, experience of IFN therapy and biochemical parameters. The following factors were identified as exhibiting an increased risk of HCC by univariate analysis: aspartate transaminase (AST) ≥71 IU/l, alanine transaminase (ALT) ≥60 IU/l, AFP ≥6 ng/ml and IFN therapy. Multivariate analysis identified that the AFP level [6‑19 ng/ml: hazard ratio (HR), 2.22; P=0.006 and ≥20 ng/ml: HR, 2.09; P=0.003] was an independent and significant risk factor for the development of HCC. A slightly elevated (6‑19 ng/ml) AFP level may be a risk factor for HCC in certain cases. By contrast, AFP levels <6 ng/ml indicate a low risk of HCC development in HCV patients with liver cirrhosis.

1 November 2020 in Internal Medicine
Verified
Journal Article
Open access
PDF file
TITatsuki Ichikawa
Tatsuki Ichikawa
HMHisamitsu Miyaaki
Hisamitsu Miyaaki
SMSatoshi Miuma
Satoshi Miuma
YMYasuhide Motoyoshi
Yasuhide Motoyoshi
MYMio Yamashima
Mio Yamashima
KNKazuhiko Nakao
Kazuhiko Nakao
Objective Patient-reported outcomes (PROs) are important measures of the quality of life (QOL) and symptoms in patients with hepatitis C virus (HCV). We evaluated the PROs at the beginning of direct-acting antiviral (DAA) treatment and three years later. A low QOL in patients with chronic liver disease suggested a low muscle mass. We compared the relationship between the QOL and muscle mass. Methods DAAs were administered to 100 patients with HCV infection. The PROs included the cirrhosis-related symptom score (CSS), presence of restless legs syndrome, Pittsburg sleep quality index (PSQI) to evaluate sleep disturbance, SF-36 to measure the QOL, and calculated body muscle mass (CBMM) measured at the beginning of treatment and three years later. Computed tomography (CT) was used to screen 82 patients for hepatocellular carcinoma at the beginning of treatment and three years later. Cross-sectional CT images of the third lumbar vertebrae were analyzed to evaluate the body composition. Results The general health perception (GHN) of SF-36 was better at three years after DAA administration than at the beginning. Changes in the GHN (dGHN) were related to an improved sleep quality on the PSQI and CSS and increased CBMM. The dGHN was positively related to changes in the skeletal muscle. The sleep quality, sleep latency, fatigue, and abdominal fullness were related to dGHN. Conclusion The QOL is related to sleep disturbance and several other symptoms. Furthermore, in patients with an increased muscle volume after DAA treatment, increased muscle mass is associated with an improvement in the QOL.

13 November 2017 in Hepatology Research
Verified
Journal Article
Closed access
PDF file
TITatsuki Ichikawa
Tatsuki Ichikawa
HMHisamitsu Miyaaki
Hisamitsu Miyaaki
SMSatoshi Miuma
Satoshi Miuma
NTNaota Taura
Naota Taura
YMYasuhide Motoyoshi
Yasuhide Motoyoshi
KNKazuhiko Nakao
Kazuhiko Nakao