Publications by authors named "Ryoko Katagiri"

Background: There are scarce data on risk factors for epithelial ovarian cancer (EOC) in Asian populations. Our goal was to advance knowledge on reproductive -related risk factors for EOC in a large population of Asian women.

Methods: This study used pooled individual data from baseline questionnaires in 11 prospective cohorts (baseline years, 1958-2015) in the Asia Cohort Consortium.

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  • * Researchers found that the average age girls start their periods is about 14 years, but it has been getting younger over the past 100 years.
  • * Different countries showed different trends, with some like China having ups and downs, while others like Japan and Singapore had a steady decline in the average age.
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Several epidemiologic studies have investigated the circulating levels of albumin, bilirubin, and uric acid (UA) in relation to cancer risk; however, they have provided equivocal evidence. In this prospective case-cohort study, we measured the plasma levels of albumin, bilirubin, and UA and investigated their association with cancer incidence in 3584 case patients and 4270 randomly selected participants with a median follow-up of 15.8 years.

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Purpose: Dietary fiber is a possible nutritional component which aids in the prevention of visceral fat accumulation. We examined the association between dietary fiber intake and visceral fat volume (VFV) by sex, and further analysed the association by major food sources of dietary fiber.

Methods: In this cross-sectional study, we measured VFV in 2779 Japanese (1564 men and 1215 women) aged 40-89 who underwent positron emission tomography/computed tomography for cancer screening between 2004 and 2005.

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Objective The aim of this study was to compare how Dietary Reference Intakes for the Japanese (DRIs), which are dietary guidelines proposing reference values for the intake of energy and nutrients by healthy Japanese people, are used by personnel whose work involves diet, food, or nutrition.Methods A web-based questionnaire survey was conducted in July 2023 among those involved in work closely related to diet, food and/or nutrition. The frequency of the use of DRIs in daily work and the details of use, including the chapter used, difficulty of use, information source for revisions, and interest in a revised version, were compared among workplaces (e.

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The female predominance of gallbladder cancer (GBC) has led to a hypothesis regarding the hormone-related aetiology of GBC. We aimed to investigate the association between female reproductive factors and GBC risk, considering birth cohorts of Asian women. We conducted a pooled analysis of 331,323 women from 12 cohorts across 4 countries (China, Japan, Korea, and Singapore) in the Asia Cohort Consortium.

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  • - The study analyzed lung cancer risk related to reproductive factors among 308,949 Asian women across four countries, finding inconsistent results in previous research.
  • - Parous women (those who have given birth) were found to have a significantly lower risk of lung cancer incidence and mortality compared to nulliparous women, especially among smokers.
  • - Higher ages at first childbirth were associated with decreased lung cancer risk, while hormone replacement therapy users showed a greater likelihood of developing non-small cell lung cancer. Future research is needed to explore these findings further.
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  • A study investigated the genetic factors influencing alcohol consumption in 175,672 Japanese individuals, focusing on a specific genetic variant (rs671) associated with drinking behavior.
  • The analysis found significant genetic interactions, identifying three key genetic locations in individuals with one variant (wild-type homozygotes) and six in those with two variants (heterozygotes), with some linked to esophageal cancer risk.
  • The research highlights how genetic makeup can shape alcohol consumption patterns and potentially increase the risk of alcohol-related diseases in different ancestral groups.
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  • The study investigates how different birth cohorts influence the relationship between reproductive and lifestyle factors and breast cancer risk.
  • It uses pooled data from 12 cohort studies and employs Cox proportional hazard regression to analyze factors like age at menarche, menopause, parity, smoking, and alcohol consumption.
  • Results indicate that parity reduces breast cancer risk in older cohorts, while lifestyle factors like smoking and alcohol show stronger associations in those born in the 1950s compared to earlier cohorts.
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Background: The increased availability of content of uncertain integrity obtained through the internet is a major concern. To date, however, there has been no comprehensive scrutiny of the fitness-for-purpose of web-based content on diet and nutrition.

Objective: This cross-sectional study aims to describe diet- and nutrition-related web-based content written in Japanese, identified via a systematic extraction strategy using Google Trends and Google Search.

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Background: Poor diet can cause sleep disorders; however, this association has not been established in older populations. This study investigated the association between dietary patterns and insomnia symptoms in independent older adults.

Methods: This cross-sectional study targeted independent older Japanese adults aged ≥74 years.

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Importance: Despite evidence of an association between reproductive factors and endometrial cancer risk, prospective studies have been conducted mainly in non-Asian countries.

Objective: To assess the association between reproductive factors, such as number of deliveries, age at menarche, or menopause, and endometrial cancer risk.

Design, Setting, And Participants: This cohort study used pooled individual data from 13 prospective cohort studies conducted between 1963 and 2014 in the Asia Cohort Consortium.

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Observational studies suggest that abnormal glucose metabolism and insulin resistance contribute to colorectal cancer; however, the causal association remains unknown, particularly in Asian populations. A two-sample Mendelian randomisation analysis was performed to determine the causal association between genetic variants associated with elevated fasting glucose, haemoglobin A1c (HbA1c), and fasting C-peptide and colorectal cancer risk. In the single nucleotide polymorphism (SNP)-exposure analysis, we meta-analysed study-level genome-wide associations of fasting glucose (~ 17,289 individuals), HbA1c (~ 52,802 individuals), and fasting C-peptide (1,666 individuals) levels from the Japanese Consortium of Genetic Epidemiology studies.

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The influence of sugar consumption on the risk of colorectal cancer (CRC) remains controversial. Prospective cohort studies focusing on total and specific types of sugar intake among the Asian population who have different patterns of sugar intake sources than American and European populations are scarce. We intended to examine the association of sugar intake with CRC risk among middle-aged adults in a Japanese large-scale population-based cohort study.

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The association between vitamin D and total and colorectal cancer risk was inconsistent in observational studies. We conducted Mendelian randomization approach in which the effect of confounding might be reduced. 110 single nucleotide polymorphisms (SNPs) associated with 25-hydroxyvitamin D concentrations were systematically selected according to the "GWAS Catalog" from all ethnic populations.

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Objective: To examine the status of food expense insufficiency in Japan during the coronavirus disease 2019 (COVID-19) pandemic and the socioeconomic and sociodemographic factors associated with food expense insufficiency.

Design: Food expense insufficiency before and after the pandemic was assessed. The multivariable-adjusted odds ratio (AOR) and 95% confidence interval (CI) were calculated for the association between food expense insufficiency and socioeconomic and sociodemographic factors.

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Background: Although studies have found an association between chronic kidney disease (CKD) and cancer incidence, the results are inconsistent.

Methods: This study included participants in the Japan Public Health Center-based Prospective Study who had data on serum creatinine measurements. We assessed the association between estimated glomerular filtration rate (eGFR) and the risk of total and site-specific cancer incidence using a systematic survey in Japan.

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Purpose: A meta-analysis suggests a relationship between abnormal glucose metabolism and primary open-angle glaucoma (POAG); however, the causal association between them remains controversial. We therefore conducted a Mendelian randomization (MR) study to assess the causal association between genetically predicted glycemic traits and the risk of POAG.

Design: Two-sample MR design.

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The tumor suppressor protein, p53, is a critical molecule involved in cancer development. However, the association between p53 Arg72Pro polymorphism and cancer risk remains unclear, possibly due to the pro-tumor potential of p53 under metabolic stress. Here, we hypothesized that the p53 Arg72Pro polymorphism plays different roles during tumorigenesis by adiposity status.

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Unlabelled: The associations between blood lipids, including total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), triglycerides, and low-density lipoprotein cholesterol (LDL-C), and colorectal cancer risk are controversial. We evaluated potential causal relationships between blood lipids and colorectal cancer risk. Using the baseline data from the Japanese Consortium of Genetic Epidemiology studies, we estimated the single-nucleotide polymorphism (SNP)-exposure associations (n = 34,546 for TC, n = 50,290 for HDL-C, n = 51,307 for triglycerides, and n = 30,305 for LDL-C).

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Unlabelled: It is unclear whether prediagnostic iron-related biomarkers in circulation are associated with cancer risk. We constructed a case-cohort of participants who had plasma samples available from the Japan Public Health Center-based Prospective Study and determined the incidence of cancer in these participants. We measured plasma concentrations of iron, ferritin, and hepcidin, and assessed the association between each biomarker and cancer incidence using a weighted Cox regression model.

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Background: Evidence of the association between chronic low-grade inflammation, as reflected by C-reactive protein (CRP) measurements, and cancer risk is equivocal. Specifically, few studies have examined this in uncommon cancers and Asian populations.

Methods: We utilised a case-cohort design consisting of multi-types of cancer (N = 3608), and a random subcohort (N = 4432) in a Japanese large population-based study, with a median follow-up time of 15.

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Seaweed has a high potential for nourishing the future planet. However, besides being beneficial, it also contains adverse components; this poses the question whether consumption of seaweed foods overall contributes beneficially or detrimentally to human health, and hence if their consumption should be promoted or restricted. This study evaluated the impact of substituting regular foods with seaweed foods in the diet, both in terms of nutritional quality ( iodine and sodium) and food safety ( arsenic, cadmium, lead, and mercury).

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Background: The association between total protein intake and all-cause mortality is inconsistent. Pneumonia is a major cause of death among the elderly, and the association between protein intake and pneumonia mortality warrants clarification.

Objectives: We aimed to examine the association between total, plant, and animal protein intake and pneumonia mortality in a prospective design.

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