Background: Given the dual potential of statins to act as both carcinogenic and antineoplastic agents, evidence from previous investigations into statin use and the risk of nonmelanoma skin cancer (NMSC) remains inconclusive. Objective: To demonstrate the impact of statin exposure on the NMSC risk in Korean patients. Methods: We carried out a multicenter cohort study based on electronic health record data aggregated from 11 Korean hospitals. Patients with hyperlipidemia who had been taking antilipidemic agents, including statins were included in this study. We applied 1:1 propensity score matching to create balanced cohorts and used Cox regression to assess the hazard ratio (HR) for NMSC. Results: A total of 18,579 statin users and a matched number of non-users were included across 11 databases. Statin use showed no significant association with an increased risk of NMSC (HR, 1.03; 95% confidence interval, 0.75–1.43). Subgroup analyses of drug exposure, age, and sex depicted no significant HR trends. Conclusion Statin exposure demonstrated no significant association with NMSC development in Korean patients with hyperlipidemia.

Background: Even before coronavirus disease 2019 (COVID-19), unexpected new infectious diseases such as severe acute respiratory syndrome, novel influenza A and Middle East respiratory syndrome (MERS) affected the Korean healthcare systems. Nevertheless, during the COVID-19 period, we still experienced difficulties in systematic response. Especially in Ulsan Metropolitan City, which had no confirmed cases during the MERS, the response infrastructure was also very insufficient. Therefore, this study aimed to investigate in depth experiences of managers and practitioners of infectious disease management organizations with the COVID-19 response and identify areas for improvement in the response to future novel infectious diseases. Methods: We recruited participants through targeted and snowball sampling. Data were collected between March 27 and May 2, 2023, through in-depth interviews with 15 healthcare workers from Ulsan Metropolitan City, South Korea, including civil servants, physicians, nurses, and administrative staff, all of whom had experience with the COVID-19 response. Results: We extracted 1,496 semantic units, 16 subcategories, and 5 categories. The participants experienced confusion at being inserted into the infectious disease response without a thorough understanding of the work due to the sudden appearance of COVID-19.In the absence of precise manuals or designated consultancies, the participants’ confusion was exacerbated by frequent changes to guidelines and insufficient communication, and they felt despair by others’ passive attitudes, which contradicted their own feelings. They also felt bewildered that they were not supported by policy, despite having chosen to support a great cause in an emergency. Excessive workloads led to health problems. Nevertheless, the participants actively sought help, received support, made efforts to construct the response environment, and felt a sense of reward when they witnessed the results. The participants emphasized the need to build up the inadequate public healthcare system in Ulsan to prepare for future novel infectious diseases, to maintain a trained, professional workforce, and to secure a sufficient budget to provide support and compensation. Conclusion The findings indicate that local governments need to establish public healthcare systems and secure professionals for responding to novel infectious diseases.

Background: Given the association between nonalcoholic fatty liver disease and metabolic risks, a new term, metabolic dysfunction- associated steatotic liver disease (MASLD) has been proposed. We aimed to explore the association between MASLD and all-cause, cause-specific mortalities. Methods: We included individuals with steatotic liver disease (SLD) from the Korean National Health Insurance Service. Moreover, SLD was defined as a fatty liver index ≥30. Furthermore, MASLD, metabolic alcohol-associated liver disease (MetALD), and alcoholic liver disease (ALD) with metabolic dysfunction (MD) were categorized based on alcohol consumption and MD. We also analyzed all-cause, liver-, cancer-, hepatocellular carcinoma (HCC)- and cardiovascular (CV)-related mortalities. Results: This retrospective nationwide cohort study included 1,298,993 individuals aged 40 to 79 years for a mean follow-up duration of 9.04 years. The prevalence of MASLD, MetALD, and ALD with MD was 33.11%, 3.93%, and 1.00%, respectively. Relative to the “no SLD” group, multivariable analysis identified that MASLD (adjusted hazard ratio [aHR], 1.28; 95% confidence interval [CI], 1.26 to 1.31), MetALD (aHR, 1.38; 95% CI, 1.32 to 1.44), and ALD with MD group (aHR, 1.80; 95% CI, 1.68 to 1.93) have a significantly higher risk of all-cause mortality. Furthermore, MASLD, MetALD, ALD with MD groups showed higher liver-, cancer- and HCC-related mortality than “no SLD” group. While all-cause specific mortalities increase from MASLD to MetALD to ALD with MD, the MetALD group shows a lower risk of CV-related mortality compared to MASLD. However, ALD with MD group still have a higher risk of CV-related mortality compared to MASLD. Conclusion SLD is associated with an increased risk of all-cause, liver-, cancer-, HCC-, and CV-related mortalities.

Background: This study aimed to examine trends in the prevalence, incidence, metabolic characteristics, and management of type 2 diabetes mellitus (T2DM) among young adults in South Korea. Methods: Young adults with T2DM were defined as individuals aged 19 to 39 years who met the diagnostic criteria for T2DM. Data from the Korean National Health Insurance Service-Customized Database (2010–2020, n=225,497–372,726) were analyzed to evaluate trends in T2DM prevalence, incidence, metabolic profiles, comorbidities, and antidiabetic drug prescription. Additional analyses were performed using the Korea National Health and Nutrition Examination Survey. Results: The prevalence of T2DM in young adults significantly increased from 1.02% in 2010 to 2.02% in 2020 (P<0.001), corresponding to 372,726 patients in 2020. Over the same period, the incidence rate remained stable within the range of 0.36% to 0.45%. Prediabetes prevalence steadily increased from 15.53% to 20.92%, affecting 3.87 million individuals in 2020. The proportion of young adults with T2DM who were obese also increased, with 67.8% having a body mass index (BMI) ≥25 kg/m² and 31.6% having a BMI ≥30 kg/m² in 2020. The prevalence of hypertension, dyslipidemia, and fatty liver disease also increased, reaching 34.2%, 79.8%, and 78.9%, respectively, in 2020. Although the overall pharmacological treatment rate remained low, the prescription of antidiabetic medications with weight-reducing properties increased over the study period. Conclusion The prevalence of T2DM among young adults in South Korea nearly doubled over the past decade. The strong association with obesity and metabolic comorbidities emphasizes the urgent need for targeted prevention and management strategies tailored to this population.

Background: Given the association between nonalcoholic fatty liver disease and metabolic risks, a new term, metabolic dysfunction- associated steatotic liver disease (MASLD) has been proposed. We aimed to explore the association between MASLD and all-cause, cause-specific mortalities. Methods: We included individuals with steatotic liver disease (SLD) from the Korean National Health Insurance Service. Moreover, SLD was defined as a fatty liver index ≥30. Furthermore, MASLD, metabolic alcohol-associated liver disease (MetALD), and alcoholic liver disease (ALD) with metabolic dysfunction (MD) were categorized based on alcohol consumption and MD. We also analyzed all-cause, liver-, cancer-, hepatocellular carcinoma (HCC)- and cardiovascular (CV)-related mortalities. Results: This retrospective nationwide cohort study included 1,298,993 individuals aged 40 to 79 years for a mean follow-up duration of 9.04 years. The prevalence of MASLD, MetALD, and ALD with MD was 33.11%, 3.93%, and 1.00%, respectively. Relative to the “no SLD” group, multivariable analysis identified that MASLD (adjusted hazard ratio [aHR], 1.28; 95% confidence interval [CI], 1.26 to 1.31), MetALD (aHR, 1.38; 95% CI, 1.32 to 1.44), and ALD with MD group (aHR, 1.80; 95% CI, 1.68 to 1.93) have a significantly higher risk of all-cause mortality. Furthermore, MASLD, MetALD, ALD with MD groups showed higher liver-, cancer- and HCC-related mortality than “no SLD” group. While all-cause specific mortalities increase from MASLD to MetALD to ALD with MD, the MetALD group shows a lower risk of CV-related mortality compared to MASLD. However, ALD with MD group still have a higher risk of CV-related mortality compared to MASLD. Conclusion SLD is associated with an increased risk of all-cause, liver-, cancer-, HCC-, and CV-related mortalities.

Background: This study aimed to examine trends in the prevalence, incidence, metabolic characteristics, and management of type 2 diabetes mellitus (T2DM) among young adults in South Korea. Methods: Young adults with T2DM were defined as individuals aged 19 to 39 years who met the diagnostic criteria for T2DM. Data from the Korean National Health Insurance Service-Customized Database (2010–2020, n=225,497–372,726) were analyzed to evaluate trends in T2DM prevalence, incidence, metabolic profiles, comorbidities, and antidiabetic drug prescription. Additional analyses were performed using the Korea National Health and Nutrition Examination Survey. Results: The prevalence of T2DM in young adults significantly increased from 1.02% in 2010 to 2.02% in 2020 (P<0.001), corresponding to 372,726 patients in 2020. Over the same period, the incidence rate remained stable within the range of 0.36% to 0.45%. Prediabetes prevalence steadily increased from 15.53% to 20.92%, affecting 3.87 million individuals in 2020. The proportion of young adults with T2DM who were obese also increased, with 67.8% having a body mass index (BMI) ≥25 kg/m² and 31.6% having a BMI ≥30 kg/m² in 2020. The prevalence of hypertension, dyslipidemia, and fatty liver disease also increased, reaching 34.2%, 79.8%, and 78.9%, respectively, in 2020. Although the overall pharmacological treatment rate remained low, the prescription of antidiabetic medications with weight-reducing properties increased over the study period. Conclusion The prevalence of T2DM among young adults in South Korea nearly doubled over the past decade. The strong association with obesity and metabolic comorbidities emphasizes the urgent need for targeted prevention and management strategies tailored to this population.

Background: Even before coronavirus disease 2019 (COVID-19), unexpected new infectious diseases such as severe acute respiratory syndrome, novel influenza A and Middle East respiratory syndrome (MERS) affected the Korean healthcare systems. Nevertheless, during the COVID-19 period, we still experienced difficulties in systematic response. Especially in Ulsan Metropolitan City, which had no confirmed cases during the MERS, the response infrastructure was also very insufficient. Therefore, this study aimed to investigate in depth experiences of managers and practitioners of infectious disease management organizations with the COVID-19 response and identify areas for improvement in the response to future novel infectious diseases. Methods: We recruited participants through targeted and snowball sampling. Data were collected between March 27 and May 2, 2023, through in-depth interviews with 15 healthcare workers from Ulsan Metropolitan City, South Korea, including civil servants, physicians, nurses, and administrative staff, all of whom had experience with the COVID-19 response. Results: We extracted 1,496 semantic units, 16 subcategories, and 5 categories. The participants experienced confusion at being inserted into the infectious disease response without a thorough understanding of the work due to the sudden appearance of COVID-19.In the absence of precise manuals or designated consultancies, the participants’ confusion was exacerbated by frequent changes to guidelines and insufficient communication, and they felt despair by others’ passive attitudes, which contradicted their own feelings. They also felt bewildered that they were not supported by policy, despite having chosen to support a great cause in an emergency. Excessive workloads led to health problems. Nevertheless, the participants actively sought help, received support, made efforts to construct the response environment, and felt a sense of reward when they witnessed the results. The participants emphasized the need to build up the inadequate public healthcare system in Ulsan to prepare for future novel infectious diseases, to maintain a trained, professional workforce, and to secure a sufficient budget to provide support and compensation. Conclusion The findings indicate that local governments need to establish public healthcare systems and secure professionals for responding to novel infectious diseases.

Background: Even before coronavirus disease 2019 (COVID-19), unexpected new infectious diseases such as severe acute respiratory syndrome, novel influenza A and Middle East respiratory syndrome (MERS) affected the Korean healthcare systems. Nevertheless, during the COVID-19 period, we still experienced difficulties in systematic response. Especially in Ulsan Metropolitan City, which had no confirmed cases during the MERS, the response infrastructure was also very insufficient. Therefore, this study aimed to investigate in depth experiences of managers and practitioners of infectious disease management organizations with the COVID-19 response and identify areas for improvement in the response to future novel infectious diseases. Methods: We recruited participants through targeted and snowball sampling. Data were collected between March 27 and May 2, 2023, through in-depth interviews with 15 healthcare workers from Ulsan Metropolitan City, South Korea, including civil servants, physicians, nurses, and administrative staff, all of whom had experience with the COVID-19 response. Results: We extracted 1,496 semantic units, 16 subcategories, and 5 categories. The participants experienced confusion at being inserted into the infectious disease response without a thorough understanding of the work due to the sudden appearance of COVID-19.In the absence of precise manuals or designated consultancies, the participants’ confusion was exacerbated by frequent changes to guidelines and insufficient communication, and they felt despair by others’ passive attitudes, which contradicted their own feelings. They also felt bewildered that they were not supported by policy, despite having chosen to support a great cause in an emergency. Excessive workloads led to health problems. Nevertheless, the participants actively sought help, received support, made efforts to construct the response environment, and felt a sense of reward when they witnessed the results. The participants emphasized the need to build up the inadequate public healthcare system in Ulsan to prepare for future novel infectious diseases, to maintain a trained, professional workforce, and to secure a sufficient budget to provide support and compensation. Conclusion The findings indicate that local governments need to establish public healthcare systems and secure professionals for responding to novel infectious diseases.

Background: Given the association between nonalcoholic fatty liver disease and metabolic risks, a new term, metabolic dysfunction- associated steatotic liver disease (MASLD) has been proposed. We aimed to explore the association between MASLD and all-cause, cause-specific mortalities. Methods: We included individuals with steatotic liver disease (SLD) from the Korean National Health Insurance Service. Moreover, SLD was defined as a fatty liver index ≥30. Furthermore, MASLD, metabolic alcohol-associated liver disease (MetALD), and alcoholic liver disease (ALD) with metabolic dysfunction (MD) were categorized based on alcohol consumption and MD. We also analyzed all-cause, liver-, cancer-, hepatocellular carcinoma (HCC)- and cardiovascular (CV)-related mortalities. Results: This retrospective nationwide cohort study included 1,298,993 individuals aged 40 to 79 years for a mean follow-up duration of 9.04 years. The prevalence of MASLD, MetALD, and ALD with MD was 33.11%, 3.93%, and 1.00%, respectively. Relative to the “no SLD” group, multivariable analysis identified that MASLD (adjusted hazard ratio [aHR], 1.28; 95% confidence interval [CI], 1.26 to 1.31), MetALD (aHR, 1.38; 95% CI, 1.32 to 1.44), and ALD with MD group (aHR, 1.80; 95% CI, 1.68 to 1.93) have a significantly higher risk of all-cause mortality. Furthermore, MASLD, MetALD, ALD with MD groups showed higher liver-, cancer- and HCC-related mortality than “no SLD” group. While all-cause specific mortalities increase from MASLD to MetALD to ALD with MD, the MetALD group shows a lower risk of CV-related mortality compared to MASLD. However, ALD with MD group still have a higher risk of CV-related mortality compared to MASLD. Conclusion SLD is associated with an increased risk of all-cause, liver-, cancer-, HCC-, and CV-related mortalities.