Smoking and Hodgkin Lymphoma: A Meta-Analysis

Abstract INTRODUCTION: The etiology of Hodgkin lymphoma (HL) is largely unknown. However, certain associations have been noted, such as familial factors and infection with viruses. Smoking has been associated with the development of multiple malignancies and some studies have reported an association between HL and smoking but the relationship of tobacco use with lymphomas in largely unclear. OBJECTIVE: To investigate the potential relationship between tobacco use and the development of HL using a meta-analysis methodology of retrospective, case-control studies. METHODS: An extensive search was conducted using Pubmed/MEDLINE through July 2008. Case-control studies that reported odds ratio (OR) and 95% confidence intervals (CI) or allow for those values to be calculated were included in our analysis. Case reports, editorials, letters to the editor, review articles and prospective studies were excluded. The smoking status was then subdivided in three groups: never smokers, former smokers and current smokers. Meta-analyses were performed comparing the risks of former and current smokers against the risk of never smokers of developing HL. Fixed and random effects models were used to assess for heterogeneity. RESULTS: Seven case-controls studies, accounting for 3201 cases and 15268 controls were included in the analysis. Most of the articles reported OR adjusted for age, sex and educational level. In former smokers, the OR was 0.73 (95% CI, 0.65 – 0.82) when compared to never smokers; no heterogeneity was detected. The current smoker group had an OR of 1.70 (95% CI, 1.36 – 2.13) when compared to the never smoker group; some heterogeneity was detected in this group (p < 0.003, I2 = 69.6%). CONCLUSIONS: Despite the heterogeneity observed in the analysis, the current smoker group seems to have a 70% increased risk of developing HL. Although a cause-effect linkage between tobacco use and HL is difficult to prove, further basic and translational research is necessary to clarify the potential etiological role of smoking in HL.

Download Full-text

Non-Hodgkin Lymphoma and Smoking: A Meta-Analysis of Case-Control Studies

Blood ◽

10.1182/blood.v112.11.5292.5292 ◽

2008 ◽

Vol 112 (11) ◽

pp. 5292-5292 ◽

Cited By ~ 1

Author(s):

Cannon Milani ◽

Sheila Pascual ◽

Joanna Mitri ◽

Jorge Castillo

Keyword(s):

Viral Infections ◽

Case Reports ◽

English Literature ◽

Meta Analysis ◽

Case Control ◽

Case Control Studies ◽

Random Effects Models ◽

Non Hodgkin Lymphoma ◽

Increased Risk ◽

The Relationship

Abstract Background: The incidence of non-Hodgkins lymphoma (NHL) has followed a sustained increasing pattern for the last few decades. Potential factors implicated in developing an increased risk for NHL include immunosuppression, bacterial, and viral infections. The pathological heterogeneity of NHL suggests multifactorial etiologies. Several reports around the world have linked lifestyle habits to the development of NHL, but thus far, the relationship between smoking and NHL has been largely inconclusive. Objective: To perform a meta-analysis of published case-control studies to clarify the potential relationship between smoking and the development of NHL. Methods: An English literature search was conducted using Pubmed of case-control studies investigating the relationship between smoking and development of NHL. Prospective studies, case reports, editorials and letters were not included. Data were gathered including the following variables: country of origin, source of cases and controls, number of female/male cases and controls, adjusted odds ratio (OR) with 95% confidence intervals (CI) for former and current smokers, divided by male/female when available, and adjustments. Effect measures were obtained trough fixed and random-effects models to assess for heterogeneity. Results: Eighteen case-control studies were included in the meta-analysis. A total of 22,226 cases and 30,792 controls were finally analyzed. Based on our meta-analysis, former smokers had an OR of 1.02 (95% CI, 0.92 – 1.12) when compared to never smokers; heterogeneity between studies was evident (p < 0.001; I2 = 75.3%). Current smokers, on the other hand, had an OR of 1.06 (95% CI, 1.00 – 1.14); some degree of heterogeneity was observed (p = 0.04; I2 = 41.1%). Conclusions: Despite the limitations of this meta-analysis, current smokers seem to have small but statistically significant increase in the risk of developing NHL. Clinically speaking, smoking may be a non-negligible risk factor for developing NHL. Although a causal relationship will be hard to prove, further research is needed to clarify the potential role of smoking in lymphomagenesis.

Download Full-text

Relevance of hMLH1 -93G>A, 655A>G and 1151T>A polymorphisms with colorectal cancer susceptibility: a meta-analysis based on 38 case-control studies

Revista da Associação Médica Brasileira ◽

10.1590/1806-9282.64.10.942 ◽

2018 ◽

Vol 64 (10) ◽

pp. 942-951 ◽

Cited By ~ 1

Author(s):

Mohammad Zare ◽

Jamal Jafari-Nedooshan ◽

Mohammadali Jafari ◽

Hossein Neamatzadeh ◽

Seyed Mojtaba Abolbaghaei ◽

...

Keyword(s):

Colorectal Cancer ◽

Cancer Susceptibility ◽

Meta Analysis ◽

Asian Population ◽

Case Control ◽

Biomedical Literature ◽

Case Control Studies ◽

Increased Risk ◽

Comprehensive Search ◽

Meta Analyses

SUMMARY OBJECTIVE: There has been increasing interest in the study of the association between human mutL homolog 1 (hMLH1) gene polymorphisms and risk of colorectal cancer (CRC). However, results from previous studies are inconclusive. Thus, a meta-analysis was conducted to derive a more precise estimation of the effects of this gene. METHODS: A comprehensive search was conducted in the PubMed, EMBASE, Chinese Biomedical Literature databases until January 1, 2018. Odds ratio (OR) with 95% confidence interval (CI) was used to assess the strength of the association. RESULTS: Finally, 38 case-control studies in 32 publications were identified met our inclusion criteria. There were 14 studies with 20668 cases and 19533 controls on hMLH1 −93G>A, 11 studies with 5,786 cases and 8,867 controls on 655A>G and 5 studies with 1409 cases and 1637 controls on 1151T>A polymorphism. The combined results showed that 655A>G and 1151T>A polymorphisms were significantly associated with CRC risk, whereas −93G>A polymorphism was not significantly associated with CRC risk. As for ethnicity, −93G>A and 655A>G polymorphisms were associated with increased risk of CRC among Asians, but not among Caucasians. More interestingly, subgroup analysis indicated that 655A>G might raise CRC risk in PCR-RFLP and HB subgroups. CONCLUSION: Inconsistent with previous meta-analyses, this meta-analysis shows that the hMLH1 655A>G and 1151T>A polymorphisms might be risk factors for CRC. Moreover, the −93G>A polymorphism is associated with the susceptibility of CRC in Asian population.

Download Full-text

Oral Contraceptive Use and Breast Cancer Risk Assessment: A Systematic Review and Meta-Analysis of Case-Control Studies, 2009–2020

Cancers ◽

10.3390/cancers13225654 ◽

2021 ◽

Vol 13 (22) ◽

pp. 5654

Author(s):

Agnieszka Barańska ◽

Agata Błaszczuk ◽

Wiesław Kanadys ◽

Maria Malm ◽

Katarzyna Drop ◽

...

Keyword(s):

Breast Cancer ◽

Oral Contraceptive ◽

Cancer Risk ◽

Meta Analysis ◽

Case Control ◽

Cochrane Library ◽

Control Group ◽

Case Control Studies ◽

Increased Risk ◽

Breast Cancer Risk Assessment

To perform a meta-analysis of case-control studies that addressed the association between oral contraceptive pills (OC) use and breast cancer (BrCa), PubMED (MEDLINE), Embase, and the Cochrane Library were searched to identify case-control studies of OC and BrCa published between 2009 and 2020. We used the DerSimonian–Laird method to compute pooled odds ratios (ORs) and confidence intervals (CIs), and the Mantel–Haenszel test to assess the association between OC use and cancer. Forty-two studies were identified that met the inclusion criteria and we included a total of 110,580 women (30,778 into the BrCa group and 79,802 into the control group, of which 15,722 and 38,334 were using OC, respectively). The conducted meta-analysis showed that the use of OC was associated with a significantly increased risk of BrCa in general, OR = 1.15, 95% CI: 1.01 to 1.31, p = 0.0358. Regarding other risk factors for BrCa, we found that increased risk was associated significantly with early menarche, nulliparous, non-breastfeeding, older age at first parity, postmenopause, obesity, smoking, and family history of BrCa. Despite our conclusion that birth control pills increase the cancer risk being supported by extensive previous studies and meta-analyzes, further confirmation is required.

Download Full-text

ASSOCIATION OF IL-8 -251T>A (RS4073) POLYMORPHISM WITH SUSCEPTIBILITY TO GASTRIC CANCER: A SYSTEMATIC REVIEW AND META-ANALYSIS BASED ON 33 CASE-CONTROL STUDIES

Arquivos de Gastroenterologia ◽

10.1590/s0004-2803.202000000-16 ◽

2020 ◽

Vol 57 (1) ◽

pp. 91-99

Author(s):

Mansour MOGHIMI ◽

Seyed Alireza DASTGHEIB ◽

Naeimeh HEIRANIZADEH ◽

Mohammad ZARE ◽

Elnaz SHEIKHPOUR ◽

...

Keyword(s):

Gastric Cancer ◽

Meta Analysis ◽

Random Effect ◽

Random Effect Model ◽

Case Control ◽

Case Control Studies ◽

Effect Model ◽

Increased Risk ◽

Mixed Populations ◽

Stratified Analysis

ABSTRACT BACKGROUND: The role of -251A>T polymorphism in the anti-inflammatory cytokine interleukin-8 (IL-8) gene in gastric cancer was intensively evaluated, but the results of these studies were inconsistent. OBJECTIVE: Therefore, we performed a meta-analysis to provide a comprehensive data on the association of IL-8 -251T>A polymorphism with gastric cancer. METHODS: All eligible studies were identified in PubMed, Web of Science, EMBASE, Wanfang and CNKI databases before September 01, 2019. The pooled odds ratios (ORs) with 95% confidence intervals (CIs) were derived from a fixed effect or random effect model. RESULTS: A total of 33 case-control studies with 6,192 cases and 9,567 controls were selected. Overall, pooled data showed that IL-8 -251T>A polymorphism was significantly associated with an increased risk of gastric cancer under all five genetic models, i.e., allele (A vs T: OR=1.189, 95% CI 1.027-1.378, P=0.021), homozygote (AA vs TT: OR=1.307, 95% CI 1.111-1.536, P=0.001), heterozygote (AT vs TT: OR=1.188, 95% CI 1.061-1.330, P=0.003), dominant (AA+AT vs TT: OR=1.337, 95% CI 1.115-1.602, P=0.002) and recessive (AA vs AT+TT: OR=1.241, 95% CI 1.045-1.474, P=0.014). The stratified analysis by ethnicity revealed an increased risk of gastric cancer in Asians and mixed populations, but not in Caucasians. Moreover, stratified by country found a significant association in Chinese, Korean and Brazilian, but not among Japanese. CONCLUSION: This meta-analysis suggests that the IL-8 -251T>A polymorphism is associated with an increased risk of gastric cancer, especially by ethnicity (Asian and mixed populations) and country (Chinese, Korean and Brazilian).

Download Full-text

Hypertension and the risk of endometrial cancer: a systematic review and meta-analysis of case-control and cohort studies

Scientific Reports ◽

10.1038/srep44808 ◽

2017 ◽

Vol 7 (1) ◽

Cited By ~ 24

Author(s):

Dagfinn Aune ◽

Abhijit Sen ◽

Lars J. Vatten

Keyword(s):

Systematic Review ◽

Endometrial Cancer ◽

Cohort Studies ◽

Contraceptive Use ◽

Meta Analysis ◽

Case Control ◽

Adjusted Relative Risk ◽

Case Control Studies ◽

Relative Risks ◽

Increased Risk

Abstract A history of hypertension has been associated with increased risk of endometrial cancer in several studies, but the results have not been consistent. We conducted a systematic review and meta-analysis of case-control and cohort studies to clarify the association between hypertension and endometrial cancer risk. PubMed and Embase databases were searched up to 27th of February 2016. Prospective and case-control studies which reported adjusted relative risk estimates and 95% confidence intervals of endometrial cancer associated with a hypertension diagnosis were included. Summary relative risks were estimated using a random effects model. Nineteen case-control studies and 6 cohort studies were included. The summary RR was 1.61 (95% CI: 1.41–1.85, I2 = 86%) for all studies, 1.73 (95% CI: 1.45–2.06, I2 = 89%) for case-control studies and 1.32 (95% CI: 1.12–1.56, I2 = 47%) for cohort studies. The association between hypertension and endometrial cancer was weaker, but still significant, among studies with adjustment for smoking, BMI, oral contraceptive use, and parity, compared to studies without such adjustment. This meta-analysis suggest an increased risk of endometrial cancer among patients with hypertension, however, further studies with more comprehensive adjustments for confounders are warranted to clarify the association.

Download Full-text

PF284 OCCUPATIONAL PESTICIDES EXPOSURE IS ASSOCIATED WITH AN INCREASED RISK OF ACUTE MYELOID LEUKEMIA: A META-ANALYSIS OF CASE-CONTROL STUDIES INCLUDING 2981 PATIENTS AND 248705 CONTROLS

HemaSphere ◽

10.1097/01.hs9.0000559348.09806.86 ◽

2019 ◽

Vol 3 (S1) ◽

pp. 93-94

Author(s):

A. Foucault ◽

N. Vallet ◽

E. Gyan ◽

O. Herault

Keyword(s):

Acute Myeloid Leukemia ◽

Myeloid Leukemia ◽

Meta Analysis ◽

Case Control ◽

Case Control Studies ◽

Increased Risk ◽

Pesticides Exposure ◽

Acute Myeloid

Download Full-text

Association between IL-13 +1923C/T polymorphism and asthma risk: a meta-analysis based on 26 case-control studies

Bioscience Reports ◽

10.1042/bsr20160505 ◽

2017 ◽

Vol 37 (1) ◽

Cited By ~ 7

Author(s):

Yueli Xu ◽

Junjuan Li ◽

Zhaolei Ding ◽

Juan Li ◽

Bin Li ◽

...

Keyword(s):

Genetic Model ◽

Meta Analysis ◽

Age Groups ◽

Allergic Inflammation ◽

Case Control ◽

Respiratory Disorder ◽

Case Control Studies ◽

Increased Risk ◽

Asthma Patients ◽

Highly Correlated

Asthma is a serious and hereditary respiratory disorder affecting all age groups. Interleukin-13 (IL-13) is a central regulator of allergic inflammation. The purpose of the present study was to estimate the relationship between IL-13 +1923C/T polymorphism and asthma susceptibility. Relevant case-control studies published between January 2000 and July 2016 were searched in the online databases. Review Manage (RevMan) 5.3 was used to conduct the statistical analysis. The pooled odds ratio (OR) with its 95% confidence interval (CI) was employed to calculate the strength of association. A total of 26 articles were retrieved, including 17642 asthma patients and 42402 controls. Overall, our results found that IL-13 +1923C/T polymorphism was significantly associated with increased risk of asthma under each genetic model (P<0.00001). Subgroup analysis by ethnicity showed that alleles and genotypes of this variant correlated with asthma among Asians and Caucasians, but only TT genotype under the homozygote model in Africans. When stratified by age group, this variant highly correlated with asthma in children and moderately in adults. Furthermore, the TT, CT and CC genotypes in asthma group were all significantly associated with increased IgE levels in sera of asthma patients when compared with controls. Our results suggested that IL-13 +1923C/T polymorphism contributed to the development of asthma. Further case-control studies with more ethnicities are still needed.

Download Full-text

The Association Between Smoking and Hodgkin Lymphoma

Blood ◽

10.1182/blood.v116.21.2560.2560 ◽

2010 ◽

Vol 116 (21) ◽

pp. 2560-2560

Author(s):

Samir Dalia ◽

Jorge J. Castillo

Keyword(s):

Hodgkin Lymphoma ◽

Prospective Studies ◽

Observational Studies ◽

Case Control ◽

Case Control Studies ◽

Current Smoking ◽

Increased Risk ◽

Dissemination Bias ◽

Newcastle Ottawa Scale ◽

Ottawa Scale

Abstract Abstract 2560 Introduction: Few risk factors for the development of Hodgkin lymphoma (HL) have been described. A relationship between smoking and the subsequent development of HL has been suggested from previous reports; however, the available data are largely conflicting. The primary objective of this meta-analysis of observational studies is to evaluate the potential epidemiologic relationship, if any, between smoking and HL. Methods: We searched MEDLINE from January 1, 1960 to June 30, 2010 for observational studies on the association between smoking and HL in adults using the keywords “smoking” and “lymphoma”. Prospective cohort studies and case-control studies that reported relative risks (RR), hazard ratios, or odds ratios with 95% confidence intervals (CI) were included. Literature search, study selection and data gathering were performed independently by the two of authors. Cases were subdivided in ever smokers and current smokers and analyzed separately. Fixed-effect model (FEM) and random-effects models (REM) were used to assess the combined outcome of individual studies. The outcome measured in our study is reported as RR (95% CI). REM was used, if needed, to account for heterogeneity between studies. Heterogeneity was evaluated using the Cochrane Q and I2 statistics. Publication bias was assessed by direct observation of a funnel plot as well as trim-and-fill statistics. Quality of the studies was assessed using the Newcastle-Ottawa scale. Results: Our initial search rendered 577 articles. After reviewing the titles and abstracts, 36 papers were selected for full-text retrieval and reference list search, from which 4 prospective and 11 case-control studies were included in the final analysis. All studies were of high quality with both case-control and prospective studies averaging a score of 8 on the Newcastle-Ottawa scale. When pooling all studies, ever smokers had a RR of 1.20 (95% CI 1.07–1.34; p=0.001); there was no heterogeneity between studies or dissemination bias. Current smokers had a RR of 1.42 (95% CI 1.20–1.68; p<0.001, Figure); there was mild heterogeneity between studies (Q=28.5, I2=45.8%, p=0.046) but no dissemination bias was identified. Based on case-control studies, ever smoking was associated with a RR of 1.16 (95% CI 1.02–1.31; p=0.02) while current smoking was associated with a RR of 1.39 (95% CI 1.14–1.69; p<0.001). Based on prospective studies, ever smoking had a RR 1.40 (95% CI 1.10–1.77; p=0.005) while current smoking had a RR 1.49 (1.02-2.18; p=0.04). Conclusions: In both retrospective and prospective studies, there is a 20% increased risk of developing HL in those patients who have ever smoked. However, the risk increases to 42% in those who were current smokers at time of diagnosis of HL. Our findings confirm a previously reported association between smoking and the development of HL, giving additional support in favor of smoking cessation. The lymphomagenic mechanism of smoking is currently unclear but could be related to a direct carcinogenic effect of tobacco-related agents or the immunomodulatory effect of smoking. Disclosures: No relevant conflicts of interest to declare.

Download Full-text

Association between tobacco use, pain expression, and maladaptive coping among patients with advanced cancer.

Journal of Clinical Oncology ◽

10.1200/jco.2016.34.26_suppl.65 ◽

2016 ◽

Vol 34 (26_suppl) ◽

pp. 65-65

Author(s):

Rony Dev ◽

Yu Jung Kim ◽

Akhila Sunkepally Reddy ◽

David Hui ◽

Kimberson Cochien Tanco ◽

...

Keyword(s):

Cancer Patients ◽

Advanced Cancer ◽

Tobacco Use ◽

Symptom Expression ◽

Advanced Cancer Patients ◽

Maladaptive Coping ◽

Increased Risk ◽

Pain Expression ◽

Former Smokers ◽

Never Smokers

65 Background: Cancer patients who smoke have been reported to have higher pain expression and increased risk for opioid abuse. The purpose of our study is to evaluate the association between tobacco use, symptom expression, and maladaptive coping in advanced cancer patients. Methods: We prospectively enrolled advanced cancer patients evaluated in an outpatient Supportive Care Center and collected data on patient demographics, cancer diagnosis, morphine equivalent daily dose (MEDD), cigarette smoking status using Behavioral Risk Factor Surveillance System, symptom expression as measured by Edmonton Symptom Assessment Scale, Cut down/Annoyed/Guilty/Eye opener (CAGE alcoholism questionnaire), short form Screener and Opioid Assessment for Patients with Pain (SOAP-SF) survey, and Brief COPE Questionnaire. Results: Among399 patients, 195 (49%) were never smokers, 158 (40%) former smokers, and 46 (11%) current smokers. The most common malignancies were gastrointestinal (21.1%) and breast (19.5%). Never smokers were more likely to be female (p = 0.005). Current smokers expressed significantly higher pain scores at consultation than former or never smokers [median 7 vs. 6 vs. 5, respectively (p = 0.015)], increased MEDD (median 90 vs. 60 vs. 50, p = 0.002), and more likely to screen CAGE positive (33% vs. 24% vs. 8.7%, p < 0.0001). Compared with former and never smokers, current smokers were significantly more likely to cope with substance use (p = 0.02), denial (p = 0.007), and self-blame (< 0.0001), while both current and former smokers significantly more likely to use venting (p = 0.04). In addition, current smokers compared with former and never smokers were significantly more likely screen positive (≥ 4) on the SOAP-SF survey (74% vs. 13% vs. 9.3%, p = < 0.0001) and clinicians rated patients to be at higher risk for maladaptive coping (6.5% vs 2.5% vs. 1.5%, p = 0.003). Conclusions: In advanced cancer, current and former smokers were significantly more likely to have higher pain expression, CAGE positivity, and increased MEDD at consultation. In addition, a history of current or past tobacco use in advanced cancer patients was associated with increased risk of maladaptive coping.

Download Full-text