Clinical benefits of smoking cessation in reducing all-cause and disease-specific mortality among older people in Taiwan: A 10-year nationwide retrospective cohort study

Impact of Lifestyle Modifications on Cancer Mortality: A Systematic Review and Meta-Analysis

Background and Objectives: Cancer survival poses significant challenges in oncology, with lifestyle modifications increasingly recognized as crucial in modifying patient outcomes post-diagnosis. This meta-analysis aims to systematically evaluate the impact of various lifestyle interventions on cancer survival across different types of cancer. Methods: A comprehensive literature search of electronic databases including PubMed, Scopus and Cochrane was performed to identify relevant studies up to 30 November 2024. Relevant studies were chosen and data were extracted and analyzed using SPSS Version 29.0 software. Results: Our systematic review included data from 98 studies involving a total of 1,461,834 cancer patients to evaluate the impact of lifestyle factors on cancer survival. Out of these, 64 studies were included in the meta-analysis. Our meta-analysis demonstrates that adherence to specific dietary patterns significantly improves cancer-specific outcomes. The Healthy Eating Index (HEI) diet was associated with a reduction in cancer-specific mortality (pooled log HR: -0.22; 95% CI: [-0.32, -0.12]; p < 0.001). Similar benefits were observed with the Mediterranean diet (aMED), which also reduced cancer mortality and recurrence (pooled log HR: -0.24; 95% CI: [-0.40, -0.07]; p < 0.001), and the Dietary Approaches to Stop Hypertension (DASH) diet (pooled log HR: -0.22; 95% CI: [-0.33, -0.12]; p < 0.001). Additionally, general dietary improvements were beneficial for breast cancer-specific mortality across 17 cohort studies (pooled log HR: -0.15; 95% CI: [-0.25, -0.06]; p < 0.001). Engaging in any form of physical activity post-diagnosis was associated with significant improvements in cancer-specific mortality or recurrence (pooled log HR: -0.31; 95% CI: [-0.38, -0.25]; p < 0.001). Participants who ceased smoking after diagnosis exhibited more favorable cancer outcomes (pooled log HR: -0.33; 95% CI: [-0.42, -0.24]; p < 0.001), with smoking cessation notably reducing cancer-specific mortality among lung cancer survivors (pooled log HR: -0.34; 95% CI: [-0.48, -0.20]; p < 0.001). Additionally, reducing alcohol intake post-diagnosis significantly improved cancer outcomes (pooled log HR: -0.26; 95% CI: [-0.33, -0.19]; p < 0.001). Alcohol moderation in gastrointestinal tract cancer survivors specifically decreased both cancer-specific mortality and recurrence (pooled log HR: -0.22; 95% CI: [-0.29, -0.15]; p < 0.001). Conclusions: Lifestyle modifications after cancer diagnosis significantly improve cancer-specific outcomes. Specific dietary patterns, increased physical activity, smoking cessation, and reduced alcohol intake are all associated with lower cancer-specific mortality. Integrating these lifestyle changes into oncology care may enhance patient survival and quality of life.

Impact of smoking cessation duration on lung cancer mortality: A systematic review and meta-analysis

BACKGROUND

Smoking history is a heterogeneous situation for different populations, and numerous studies suggest that smoking cessation is conducive to reduce the mortality of lung cancer. However, no quantitative meta-analysis regarding smoking cessation duration based on different populations has demonstrated it clearly.

METHODS

We systematically searched four electronic databases (PubMed, Embase, the Cochrane Central Register of Controlled Trials, and Scoups) till February 2023. Eligible studies reported the association between lung cancer survival and duration of smoking cessation. Additionally, we stratified the study population according to whether they had lung cancer at the time they quit smoking. Studies were pooled with the random-effects model.

RESULTS

Out of the 11,361 potential studies initially identified, we included 24 studies involving 969,560 individuals in our analysis. Lung cancer mortality varied across two groups: general quitters and peri-diagnosis quitters. For general quitters, those who had quit smoking for less than 10 years exhibited an RR of 0.64 (95% CI [0.55-0.76]), while those who quit for 10-20 years had an RR of 0.33 (0.25-0.43), over 20 years had an RR of 0.16 (0.11-0.24), and never-smokers had an RR at 0.11 (0.07-0.15). Among peri-diagnosis quitters, the 1-year Overall Survival (OS) showed an RR of 0.80 (0.67-0.96), the 2-year OS had an RR of 0.89 (0.80-0.98), the 3-year OS had an RR of 0.93 (0.84-1.03), and the 5-year OS had an RR of 0.85 (0.76-0.96).

CONCLUSIONS

Earlier and longer smoking cessation is associated with reduced lung cancer mortality, no matter in which cessation stage for two different populations.

Estimating smoking-attributable lung cancer mortality in Chinese adults from 2000 to 2020: a comparison of three methods

BACKGROUND

Smoking is a significant public health concern in China and a leading cause of lung cancer deaths among adults. This study aims to employ three methods to estimate smoking-attributable lung cancer mortality among Chinese adults from 2000 to 2020.

METHODS

Population attributable fractions (PAFs) of lung cancer deaths caused by smoking were estimated using lagged smoking prevalence, Peto-Lopez, and dose-response relationship methods, separately. Smoking exposure was obtained from national tobacco surveys in China, and relative risks (RR) were derived from a meta-analysis of state-of-the-art studies among the Chinese population. Finally, we estimated the sex- and age-stratified smoking-attributable lung cancer deaths in Chinese population in 2000, 2005, 2010, 2015, and 2020.

RESULTS

The PAFs estimated using 5- and 10-year lagged smoking prevalence method (45-47%) and Peto-Lopez method (46-47%) were similar, while PAFs calculated using the dose-response method were highest (47-58%). The PAFs were consistently higher in males than in females. Age-specific PAFs estimated by lagged smoking prevalence method (54-60%) and the Peto-Lopez method (57-61%) in males were similar and relatively stable, with slight decreases in older populations, while the dose-response relationship-based PAFs increased with age and fluctuated by year. By using the above methods, smoking-attributable lung cancer deaths were estimated to be 134,100, 134,600, 136,600, and 155,300 in 2000 increasing to 310,300, 301,100, 306,000, and 314,700 in 2020, respectively.

CONCLUSION

The estimation from dose-response methods could better reflect the smoking effect, however, high-quality data and accurate estimation of parameters are necessary.

Smoking cessation and subsequent risk of cancer: A pooled analysis of eight population-based cohort studies in Japan

BACKGROUND

Although East Asia is one of the largest tobacco-epidemic regions in the world, only a few prospective studies from Asia have investigated the impact of smoking and cessation of smoking on cancer. We aimed to assess the effect of cessation of smoking on the risk of cancer using eight population-based cohort studies in Japan.

METHODS

We analyzed pooled data from eight population-based prospective cohort studies in Japan with more than 320,000 participants to assess the effect of smoking cessation on the risk of total cancers and smoking-related cancers.

RESULTS

After adjustment for potential confounders, cancer risks in men with >21years of smoking cessation before baseline were found to decrease to the same level as never smokers for total cancer (never smokers: reference; former smokers with ≥21 years since smoking cessation: HR, 1.01; 95%CI: 0.91, 1.11). Even men who are heavy smokers (more than 20 pack-years) reported a reduced risk of total cancer (never smokers: reference; former smokers with ≥21 years since smoking cessation: HR, 1.06; 95%CI: 0.92, 1.23). In women, the risk of total cancer did not differ from that of never smokers after 11 years of smoking cessation before baseline (never smokers: reference; former smokers with ≥11 years since smoking cessation: HR, 0.96; 95%CI: 0.74, 1.23).

CONCLUSIONS

Our study suggests that longer duration of smoking cessation may attenuate the risk of cancer in both men and women, and that even heavy smokers (more than 20 pack-years) were found to benefit from quitting smoking.

The effect of alcohol consumption on household income in Ireland

This paper presents a study of the effects of alcohol consumption on household income in Ireland using the Slán National Health and Lifestyle Survey 2007 dataset, accounting for endogeneity and selection bias. Drinkers are categorised into one of four categories based on the recommended weekly drinking levels by the Irish Health Promotion Unit; those who never drank, non-drinkers, moderate and heavy drinkers. A multinomial logit OLS Two Step Estimate is used to explain individual's choice of drinking status and to correct for selection bias which would result in the selection into a particular category of drinking being endogenous. Endogeneity which may arise through the simultaneity of drinking status and income either due to the reverse causation between the two variables, income affecting alcohol consumption or alcohol consumption affecting income, or due to unobserved heterogeneity, is addressed. This paper finds that the household income of drinkers is higher than that of non-drinkers and of those who never drank. There is very little difference between the household income of moderate and heavy drinkers, with heavy drinkers earning slightly more. Weekly household income for those who never drank is €454.20, non-drinkers is €506.26, compared with €683.36 per week for moderate drinkers and €694.18 for heavy drinkers.

Smoking cessation and receipt of cessation advice from health professionals among older smokers in Taiwan

OBJECTIVES

To examine the prevalence and correlates of smoking cessation and receiving professional cessation advice among older smokers in Taiwan.

METHODS

Cross-sectional data from the 2008-2010 and 2012 Taiwan Adult Smoking Behavior Survey was used to form a sample of 4081 recent active smokers aged 50+, comprising current smokers and former smokers who quit smoking within the past 12months. We examined three outcome variables: quit attempt in the past 12months, successful cessation for at least 3months, and receipt of health professional cessation advice. Multivariate logistic regressions were used to identify significant correlates.

RESULTS

During the study period, the annual quit attempt rate was 41.4%, annual successful cessation rate was 4.7%, and prevalence of receiving cession advice among smokers who visited health professionals within the past 12months was 72.3%. After controlling for other covariates, quit attempts were significantly higher in 2009 and positively associated with higher education, poorer health status, smoke-free homes, and receipt of cessation advice. Successful cessation was significantly higher in 2009, positively associated with older age, higher income, and smoke-free homes, and negatively associated with receiving cessation advice. Receipt of cessation advice was significantly lower in 2010 and 2012, positively associated with male gender, older age, and poorer health status, and negatively associated with higher education.

CONCLUSIONS

Our results suggest that targeting lower educated and lower income subgroups, adopting effective strategies to increase voluntary smoke-free home rules, and improving professional cessation advice will have great potential to further reduce smoking prevalence in older smokers.