Adherence to Cancer Prevention Guidelines and Cancer Incidence and Mortality: A Population-Based Cohort Study

Connection between trajectory of primary cancer monitoring indicators and mortality after cancer in South Korea

BACKGROUND

Cancer remains a leading global cause of mortality, responsible for nearly 10 million deaths in 2020. Given the country's low birth rate and aging population, the escalating cancer burden poses significant challenges to its healthcare systems. This study aimed to investigate the relationship between lifestyle risk factors and cancer case fatality, emphasizing the collective impact of these factors through a prevention index at the regional level.

METHODS

The study focused on ten cancer types, categorizing counties into three levels of cancer incidence rates using group-based trajectory modeling to identify disparities in patterns and levels among groups. Additionally, we segmented the proportions of obesity prevalence, average daily per capita smoking amount, prevalence of smoking, prevalence of high-risk alcohol consumption, prevalence of hypertension diagnosis, prevalence of diabetes diagnosis, and cancer case fatality into three groups through group-based trajectory modeling. Cox proportional hazard models were employed to evaluate the hazard ratios (HR) for cancer case fatality, adjusting for age, sex, income level, and cancer stage.

RESULTS

The study population comprised 294,070 cancer patients, with thyroid, stomach, colorectal, breast, and lung cancers being the most common. The prevention index (PI) levels, calculated from six primary prevention indicators, were categorized into High, Medium, and Low grades. Counties with higher PI levels (H) exhibited significantly lower cancer case fatality among cancer patients compared to those with lower PI levels (L). Across all cancer types, females had lower cancer case fatality compared to males, higher age was linked to higher cancer case fatality, advanced stage cases had the highest cancer case fatality, and the highest income quintile consistently showed the lowest cancer case fatality.

CONCLUSIONS

The study highlights the significant inverse relationship between primary prevention indicator levels and cancer case fatality. Higher scores on primary prevention indicators are associated with lower cancer mortality among cancer patients for various cancer types, underscoring the importance of comprehensive, community-based prevention strategies in mitigating cancer risk and improving public health outcomes in South Korea.

Cancer risk according to lifestyle risk score trajectories: a population-based cohort study

BACKGROUND

While individual lifestyle behaviors have been associated with cancer risk, combined impact of these factors remains understudied. This research explores relationships between lifestyle risk score trajectories and cancer risk within the Korean population.

METHODS

A cohort of 3,451,189 cancer-free men and women who participated in a health examination between 2002 and 2003, provided by the National Health Insurance, was studied. Lifestyle risk score trajectories were determined using group-based trajectory modeling based on total score of four modifiable unhealthy behaviors: current smoking, heavy alcohol drinking, excess body weight, and physical inactivity repeatedly observed three times between 2002 and 2007. Scores ranged between 0 (low risk) and 8 (high risk). The Cox proportional hazards model was applied to examine the association between these trajectories and cancer incidence.

RESULTS

During the follow-up time (2008-2019), 312,075 cancer cases were identified. Among men, seven trajectories were identified, and trajectories of high lifestyle risk scores increased cancer risk of all cancer combined, cancer subgroupings, upper aero-digestive, stomach, colorectal, liver, gallbladder, pancreatic, lung, and bladder cancer, but inverse relation was observed for prostate cancer. Among women, four trajectory groups showed similar trends.

CONCLUSIONS

Maintaining a healthy lifestyle and avoiding unhealthy behaviors are essential for cancer prevention.

A comparative study of health behaviors in adult male cancer survivors and the general male population in Korea: from the Korea national health and nutrition examination survey VII-VIII (2016-2021)

BACKGROUND

As healthy living becomes crucial for cancer survivors, discussing the health risk behaviors of male cancer survivors, who are more prone to such behaviors, is essential. This study compared health-related behaviors and obesity among male cancer survivors and the general male population in Korea.

METHODS

This cross-sectional, matched case-control study used data from the Korea National Health and Nutrition Examination Survey (KNHANES). Of 11,760 participants, 349 cancer survivors and 1,047 controls were matched by propensity scores. Logistic regression evaluated differences in BMI, smoking, alcohol consumption, physical activity, and diet.

RESULTS

Cancer survivors had lower odds of being overweight and higher odds of being former smokers and drinkers than controls. No significant differences were found in physical activity or diet. However, the middle-aged and older cancer survivors were more likely to be overweight and obese, respectively. The middle-aged survivors were also more likely to be former smokers, while the older survivors were more likely to be former drinkers.

CONCLUSION

Cancer survivors were more likely to have a normal weight, be past smokers, or be former drinkers compared with controls. Education on cancer prevention is required to improve health-related behaviors and prevent secondary cancer.

Longitudinal Trends of Comorbidities and Survival Among Kidney Cancer Patients in Asian Population

BACKGROUND

Comorbidity could influence cancer diagnosis, treatment, prognosis, or survival. Although comorbidity burden in kidney cancer patients is high, limited evidence exists on the longitudinal patterns of individual comorbidity prevalence and its impact on overall survival among kidney cancer patients, particularly in Asian populations.

METHODS

We included adults diagnosed with kidney cancer between 2010 and 2021 using the Korean nationwide health insurance database. Comorbidities assessed were any 1 of 19 specific medical conditions, diagnosed within 1 year prior to cancer diagnosis. We calculated the incidence and age-standardized incidence rate of kidney cancer, prevalence of individual medical conditions as single or multiple comorbidities, and overall survival probability of kidney cancer patients over a 12-year period. We estimated the odds ratio (OR) of having individual and multiple comorbidities with age and sex as independent covariates and adjusted for other comorbidities. Kaplan-Meier curves were used for overall survival at different time frames up to 5 years of follow-up.

RESULTS

Among kidney cancer patients (N = 42,740), 68.7% were men, and median (interquartile range) age was 59 (49-68) years. Approximately 76% of patients had at least one comorbidity at the time of cancer diagnosis. Overall, hypertension (51.3%), dyslipidemia (40.2%), mild liver disease (27.4%), diabetes (25.1%), and peptic ulcer disease (18.9%) were the most prevalent comorbidities. The proportion of patients having three or more comorbidities continuously increased from 2010 (29.4%) to 2021 (44.9%). Having more comorbidities was associated with a lower probability of overall survival.

CONCLUSION

Comorbidities were prevalent in kidney cancer patients, and the proportions of patients with multiple conditions increased over time. Although survival probability increased over time, it was attenuated by having more comorbidities. Our data emphasizes the importance of comprehensive management for both cancer and comorbid conditions in kidney cancer patients.

Cancer survivors' adherence to the American cancer society and American institute of cancer research dietary guidelines in Lebanon

BACKGROUND

Adequate diet and lifestyle practices are postulated to improve health and enhance wellbeing of cancer survivors. Despite the heavy cancer burden in Lebanon, little is known about the diet quality of survivors. This cross-sectional study assessed the compliance of survivors in remission with the American Cancer Society/American Institute Research Fund (ACS/AICR) diet and physical activity guidelines.

METHODS

Cancer survivors in remission for at least 3 months and attending oncology clinics in two referral centers in Beirut, Lebanon were recruited. Adherence to the ACS/AICR was assessed by examining the compliance to guidelines promoting fruits, vegetables and whole grain and discouraging elevated alcohol, meat and energy dense foods intake. Dietary data was assessed through food frequency and lifestyle questionnaires administered face to face and through phone interviews. Anthropometrics, food security and sociodemographic data was also collected. Univariate and bivariate descriptive and logistic regressions were used to determine predictors of adherence rates to the ACS/AICR score.

RESULTS

A total of 268 participants were recruited (mean age = 59 ± 23 years, 83% females, 70% breast cancer). Mean time since remission was 3.2 ± 4 years and the majority (72%) had food insecurity. Low physical activity and overweight/obesity were present in 65% and 67% of the survivors, respectively. Median adherence score with the ACS/AICR score was 9.0 out of 15. The majority of survivors had complete adherence to the moderate meat and alcohol consumption guidelines. However, 98% were noncompliant with the whole grains' consumption guidelines. Cancer type, site of recruitment and education were the significant predictors of the ACS/AICR diet adherence score.

CONCLUSION

This study highlights the elevated rates of overweight/obesity, physical inactivity and the alarmingly low adherence with the whole grains consumption guideline among cancer survivors in remission. Policy makers ought to use study findings to redirect government subsidization and educational interventions in the country and physicians should stress the importance of adherence to a healthy diet during remission through counseling and timely referral.

Increased risk of cardiovascular disease among kidney cancer survivors: a nationwide population-based cohort study

Background

Cardiovascular disease (CVD) is a major concern of morbidity and mortality among cancer survivors. However, few evidence exists on the short- and long-term risk of CVD in kidney cancer (KCa) survivors.

Methods

In this nationwide, large population-based retrospective cohort study, we used the Korean national health insurance and medical checkup survey linkage database (2007-2021), drawn from the entire Korean population. We included adults diagnosed with KCa as the first primary cancer and matched them to an individual without KCa at a 1:5 ratio. The primary outcome was CVD incidence, including myocardial infarction, stroke, atrial fibrillation, heart failure, peripheral arterial occlusion, and venous thromboembolism (VTE). We evaluated CVD risk at 6 months, 1 year, and 5 years following cancer diagnosis, using Fine-Gray competing risk models that accounted for death as a competing factor.

Results

A total of 149,232 participants were included (KCa survivors: N=20,093 and matched non-KCa individuals: N=129,139). After 6-month follow-up, KCa survivors showed an increased risk of CVD compared to the general population (subdistribution hazard ratio (HR) 2.70, 95% confidence interval (CI) 2.31-3.15). After 1 year, KCa survivors had a higher risk of CVD (HR=1.77, 95% CI: 1.56-2.00). After 5 years, this elevated CVD risk remained (HR=1.10, 95% CI: 1.03-1.18), with VTE identified as the primary contributing disease (HR=3.05, 95% CI:2.59-3.59).

Conclusion

KCa survivors had an increased risk of CVD up to 5 years after cancer diagnosis compared to the general population. Our findings emphasize the importance of comprehensive healthcare management for both CVD and KCa throughout cancer survivorship.

Combinations of lifestyle behaviors and cancer risk among Korean adults

Combinations of lifestyle behaviors may lead to different cancer risks. This study aimed to identify the latent classes based on lifestyle behavior trajectories and to investigate the association between these latent classes and cancer risk. Participants in the 2002-2003 National Health Insurance Service general health examination were included. Data on smoking, alcohol drinking, body mass index (BMI), and physical activity measured four times between 2002 and 2009 were analyzed. Incident cancer cases were tracked from 2010 to 2018. Patterns of alcohol drinking, smoking, BMI, and physical activity and latent classes based on trajectories of smoking, alcohol drinking, BMI, and physical activity were identified. Among 2,735,110 adults (1,787,486 men and 947,624 women), 111,218 (69,089 men and 42,129 women) developed incident cancer. Six latent classes of lifestyle behavior were identified, with Class 1 (healthy class) involving only 0.2% of men and 0.5% of women. The highest risk class in males tended to be steady light drinkers and steady moderate smokers, have steady low frequency of physical activity, and be obese. This class showed a 1.47 times higher (95% CI = 1.29-1.69) risk of all cancers than did the healthy class. Among women, there was only an association between the highest risk class (tendency to be non-drinkers, light smokers) and colorectal cancer (HR = 1.70, 95% CI = 1.02-2.83). Only a small percentage of participants maintained a long-term healthy lifestyle. Identifying classes of behavior combinations and their links to cancer development is therefore critical for cancer prevention.

Adherence to the World Cancer Research Fund/American Institute for Cancer Research and Korean Cancer Prevention Guidelines and cancer risk: a prospective cohort study from the Health Examinees-Gem study

OBJECTIVES

The purpose of this study was to explore the association between adherence to 2 cancer prevention recommendations and cancer risk.

METHODS

In total, 104,386 individuals aged 40-69 years old who were recruited between 2004 and 2013 in the Health Examinees-Gem study were included. Adherence scores were constructed based on 8 items from the World Cancer Research Fund/American Institute for Cancer Research (WCRF/AICR) cancer prevention recommendations, including body weight, physical activity, diet, alcohol consumption and breastfeeding, and on 6 items from the Korean cancer prevention guidelines (smoking status, eating vegetables and fruits, salty foods, alcohol intake, physical activity, and body weight). A Cox proportional hazards model was used to estimate the associations between adherence scores and the risk of total and 5 major cancers.

RESULTS

The multivariable hazard ratio (HR) for total cancer with the high adherence score versus the lowest score (4.25-7.00 vs. 0.00-3.25) for the WCRF/AICR guidelines was 0.91 (95% confidence interval [CI], 0.82 to 1.00) in men. A reduced breast cancer risk was observed among women with the highest score. Men within the highest category of the Korean cancer prevention guideline score (3.25-6.00) had an HR of 0.80 (95% CI, 0.73 to 0.88) for developing total cancer compared to men within the lowest score (0.00-2.50). The higher adherence group among men showed lower risks of developing stomach, colorectal, and lung cancers.

CONCLUSIONS

Adhering to guidelines for cancer prevention can help to reduce the risk of developing cancer in Korean men. The association might differ by cancer type and gender.

Individual and joint effect of socioeconomic status and lifestyle factors on cancer in Korea

BACKGROUND

There is limited evidence on the individual and joint effect of socioeconomic status (SES) and unhealthy lifestyle on cancer. Therefore, this study aimed to examine the effects of these factors on cancer incidence and mortality.

METHODS

In this population-based cohort study, income was used as the proxy of SES. A combined unhealthy lifestyle score was obtained using data on smoking, alcohol consumption, physical activity, and body mass index. Hazard ratios were estimated using a Cox proportional hazards model.

RESULTS

The study included data on 8,353,169 participants (median follow-up period, 17 years). Although the association between low income and cancer incidence varied depending on cancer type, low income consistently increased the risk of cancer-related death with a social gradient. Unhealthy behaviors increased the risk of cancer incidence and mortality, except for thyroid and breast cancer in women and prostate cancer in men. Compared with the wealthiest and healthiest individuals, the poorest and unhealthiest men and women showed 2.1-fold (2.05-2.14) and 1.36-fold (1.31-1.41) higher risk of cancer-related death, respectively. The joint effect was most robust for lung, liver, head, and neck cancers in men and liver and cervical cancers in women; further, the effect was stronger with cancer-specific mortality than with incidence.

CONCLUSION

In conclusion, income and combined healthy lifestyle behaviors have individual and joint effects on cancer incidence and mortality. The effect varies by cancer type and sex.