Pulmonary Tuberculosis and Risk of Lung Cancer: Comparison
Please note this is a comparison between Version 2 by Amina Yu and Version 1 by Lee Kyoung Hwa.

Lung cancer accounts for approximately 18.4% of the total cancer-related deaths, the highest of all cancer types. The prognosis of lung cancer is relatively unfavorable compared to that of other malignancies, and as a prognosis largely depends on the stage of onset, thus, the early diagnosis of lung cancer is very important. Pulmonary tuberculosis (TB) is a known risk factor for lung cancer.

  • pulmonary tuberculosis
  • lung cancer
  • meta regression
  • burden of tuberculosis

1. Introduction

Chronic inflammation resulting in pathological changes is a major risk factor in carcinogenesis. Inflammation is known to play a key role in carcinogenesis, such as infection with hepatitis B and C viruses in hepatocellular carcinoma, Helicobacter pylori in gastric cancer, and human papilloma virus in gynecological cancers [7][1]. Several meta-analyses have shown that previous inflammatory diseases in the lungs, such as pneumonia, chronic bronchitis, and pulmonary tuberculosis (TB), may increase the risk of lung cancer (relative risk ratio 1.36–1.90), independent of cigarette smoking [8,9][2][3]. According to forty-nine studies, pulmonary and extra-pulmonary TB infections increase the risk of 10 cancer types, including head and neck cancer, leukemia, lymphoma, gastrointestinal cancer, kidney cancer, bladder cancer, and lung cancer [10][4]. Thus, TB infection may influence the pathogenesis of lung cancer with or without cigarette smoking. To prevent the emergence of airborne transmittable TB and its progression to cancer, the control and prevention of TB is very important.

2. Pulmonary TB and Risk of Lung Cancer with All Eligible Studies

The overall association between a previous history of pulmonary TB and newly diagnosed lung cancer was statistically significant (odds ratio (OR): 2.09; 95% confidence interval (CI): 1.62–2.69, p < 0.001). There was high heterogeneity (I2 = 95%), no evidence of publication bias, the egger p-value was 0.447, and no visual asymmetry in the funnel plot (Figure 21A and Figure 32A). In the subgroup analysis by TB burden, the high-burden countries showed higher OR (2.57, 95% CI: 1.68–3.93, p < 0.001) than the medium-burden (OR: 2.48, 95% CI: 1.71–3.58, p < 0.001) and low-burden countries (OR: 1.77, 95% CI: 1.22–2.56, p = 0.003). Geographically, East Asia and the Pacific region showed a prominent risk (OR: 2.49, 95% CI: 1.83–3.39, p < 0.001) compared to the Europe and Central Asia (OR: 1.60, 95% CI: 0.80–3.22, p = 0.185) or North America (OR: 1.53, 95% CI: 1.11–2.12, p = 0.010) regions. The economic income statuses of the countries also reflected the characteristics of patients with TB, and the countries with upper-middle incomes (OR: 2.57, 95% CI: 1.68–3.93, p < 0.001) demonstrated a higher risk of lung cancer than high-income status countries (OR: 1.91, 95% CI: 1.41–2.59, p < 0.001). The association between pulmonary TB and newly developed lung cancer was statistically significant regardless of the adjustment for age, sex, smoking status, and cohort type or study design. The magnitude of association was similar regardless of whether pulmonary TB was diagnosed based on medical records (OR: 2.26, 95% CI: 1.29–3.94, p = 0.004), imaging (OR: 2.13, 95% CI: 1.16–3.92, p = 0.015), or self-report/physical examination (OR: 1.96, 95% CI: 1.56–2.47, p < 0.001). The heterogeneity within subgroups remained at a high level in a majority of the subgroup analyses (Table 21).
Figure 21. Forest plots of risk estimates for the association between tuberculosis and lung cancer. (A) Meta-analysis of all eligible studies. (B) Meta-analysis of high-quality studies.
Figure 32.
Funnel plot of the study estimates. (
A
) All eligible studies. (
B
) High-quality studies.
Table 21. Meta-analysis of 33 eligible cohorts to assess the association between pulmonary tuberculosis and lung cancer.
Subgroup No. of Cohorts * OR (95% CI) p-Value I2 Value (%) p-ValueI2 between

Subgroups (%)
I2 Value (%) I2 between

Subgroups (%)
 All cohorts 33 2.09 (1.62–2.69) <0.001 95
Supplementary Table S2. Of these, patients with a low mean age at diagnosis of pulmonary TB showed a significant association between pulmonary TB and lung cancer. The primary analysis with all 32 articles estimated a regression coefficient of 0.949 (p < 0.001). The secondary analysis with eight high-quality studies with stringent TB diagnostic methods showed similar results (regression coefficient = 0.945, p < 0.001) (Figure 43).
Figure 43. Meta-regression analysis of the mean patient age and association between tuberculosis and lung cancer. (A) All eligible studies. (B) High-quality studies.
Table 43. Quality assessment of the included case–control studies using the Newcastle–Ottawa Scale.
Study Selection Comparability Outcome Quality Score
Adequacy of Case Definition Degree of Representation of Cases Selection of Controls Definition of Controls Comparability of Cases and Controls on the Basis of Design or Analysis Confirmation of Exposure Same Method of Confirmation for Cases and Controls Non-Response Rate
b was conducted in 1996–2001 (1205 cases and 1541 controls). A study can be awarded a maximum of one star for each numbered item within the Selection and Outcome categories. A maximum of two stars can be given for Comparability.
Table 54. Quality assessment of the included retrospective cohort studies using the Newcastle–Ottawa Scale.
  Selection Comparability Outcome Quality

Score
Study Degree of Representation of the Exposed Cohort Selection of the Non-Exposed Cohort Confirmation of Exposure Demonstration That the Current Outcome of Interest Is Absent at the Start of the Study Comparability of Cohorts Based on Design or Analysis Assessment of Outcome Sufficiency of Follow-Up to Detect Outcomes Adequacy of Follow-Up of Cohorts
 
 All studies 8 2.26 (1.29–3.94) 0.004 99  
An et al. 2020 [20]An et al. 2020 [5]
Kim et al. 2020 [* 19]Kim et al. 2020 [31* * * ]** * * * 9 * *   * ** * *   7
 TB burden of country
 Country of TB burden          
Yang et al. 2015 [22]Yang et al. 2015 [6] * * * * **   * *
Oh et al. 2020 [21]8 Oh et al. 2020 [32] * *   * ** * * * 8    Low 18 1.77 (1.22–2.56)    Low0.003 97 7 2.04 (1.12–3.73) 0.020
Yang et al. 2015 [2312
]Yang et al. 2015 [7]99 78
* * * * * * * * 8
Simonsen et al. 2014 [24]Simonsen et al. 2014 [33] * *    Medium 6 2.48 (1.71–3.58) <0.001 75
   Medium
8
* * * * * * 8 [8]1 4.18 (3.15–5.55) <0.001 -
Bae et al. 2013 [26]Bae et al. 2013 [34] * *   * ** * *   7    High 9 2.57 (1.68–3.93) <0.001 81
 Region of country
   East Asia and Pacific 19
* * * * *    High 0 - - -
Shiels et al. 2011 [29]Shiels et al. 2011 [35] * * *2.49 (1.83–3.39) <0.001
 93 58
   Europe and Central Asia 7
Hosgood et al. 2013 [25]Hosgood et al. 2013   * * 7
Lo et al. 2013 [27]Lo et al. 2013 [9] * * * * **   * * 8 * ** * * * 9 Region of country    
Bodmer et al. 2012 [28]Bodmer et al. 2012 [10  ]   
* * * * 1.60 (0.80–3.22) 0.185 98
** * * *
Yu et al. 2011 [30]Yu et al. 2011 [36] * *9 * * * * *      East Asia and Pacific 4 2.79 (1.21–6.39) 0.016 98 0
7 Koshiol et al. 2010 [31]Koshiol et al. 2010 [11] * * * * **   * * 8    Europe and Central Asia 4 1.79 (0.67–4.77) 0.244 99
Park et al. 2010 [32]Park et al. 2010 [12]    North America 7    North America 0 - - -

Abbreviations: CI, confidence interval; No, Number; OR, odds ratio; TB, tuberculosis.

4. Stratified and Sensitivity Analysis

The quality of the 33 included articles was evaluated using the NOS. The quality assessment of 27 case–control studies is shown in Table 43 and that of six retrospective cohort studies is demonstrated in Table 54. Meta-regression analyses were performed with continuous variables, such as the mean age at diagnosis of pulmonary TB, baseline characteristics including comorbidity, and pathological cell type of lung cancer. All  the results are shown in
*
*
*
*
**   *   7
1.53 (1.11–2.12) 0.010 0
Liang et al. 2009 [33]Liang et al. 2009 [13] * * * * **   * *  Economic status of country
8
Wang et al. 2009 [34]Wang et al. 2009 [14] * * * * *   * * 7    High-income
Galeone et al. 2008 [35]Galeone et al. 2008 [24 151.91 (1.41–2.59) ] * *<0.001 96 20
* * **   * * 8    Upper-middle-income 9 2.57 (1.68–3.93) <0.001
Ramanakumar et al. 2006 [36] Ramanakumar et al. 2006 [16]81
a * * * * **   * * 8  Age
Ramanakumar et al. 2006 [36] Ramanakumar et al. 2006 [16] b * * * * **   * * 8    Adjusted
Zatloukal et al. 2003 [29 37]Zatloukal et al. 2003 2.00 (1.54–2.61) [<0.001 95 14
17] * * * * **   * * 8    Not adjusted 4 3.84 (1.21–12.15) 0.022 82
Chan-Yeung et al. 2003 [38]Chan-Yeung et al. 2003 [18] * * * *   * * 7  Sex
*
Kreuzer et al. 2002 [39]Kreuzer et al. 2002 [19] * * * * *   * *    Adjusted 22 2.23 (1.60–3.11) <0.001 96 0
7
Brenner et al. 2001 [40]Brenner et al. 2001 [20] * * * * **   * * 8    Not adjusted 11 1.90 (1.47–2.46) <0.001
Kreuzer et al. 2001 [4161
]Kreuzer et al. 2001 [21]  Smoking
   Adjusted 22 2.03 (1.51–2.73) <0.001 90 0
   Not adjusted 11 2.19 (1.34–3.59) 0.002 98
 Hypertension
   Adjusted 2 1.92 (0.66–5.57) 0.230 99 0
   Not adjusted 31 2.10 (1.62–2.73) <0.001 92
 Diabetes
   Adjusted 2 1.72 (0.48–6.20) 0.404 99 0
   Not adjusted 31 2.13 (1.63–2.77) <0.001 94
 Respiratory comorbidities
   Adjusted 8 1.32 (0.93–1.86) 0.121 94 90
   Not adjusted 25 2.51 (2.04–3.08) <0.001 78
* * * * * * * * 8
Zhou et al. 2000 [42]Zhou et al. 2000 [22] * * * * *   * * 7
Osann et al. 2000 [43]Osann et al. 2000 [23] * * * * **   * * 8
Mayne et al. 1999 [44]Mayne et al. 1999 [24] * * * * *   * * 7
Ko et al. 1997 [45]Ko et al. 1997 [25] * * * *   * * * 7
Schwartz et al. 1996 [46]Schwartz et al. 1996 [26] * * * * **   * * 8
Luo et al. 1996 [47]Luo et al. 1996 [27] * * * * *   * * 7
Wu et al. 1995 [48]Wu et al. 1995 [28] * * * * **   * * 8
Alavanja et al. 1992 [49]Alavanja et al. 1992 [29] * * * * **   * * Wu-Williams et al. 1990 [50]Wu-Williams et al. 1990 [30] * * * * **   *  Cohort of the study
* 8    Population-based 23 1.95 (1.41–2.68) <0.001 96 0
   Hospital-based 10 2.36 (1.85–3.01) <0.001 49
 Study design
   Prospective cohort study 4 1.96 (1.22–3.15) 0.005 84 94
   Retrospective cohort study 2 3.95 (3.58–4.36) <0.001 0
   Case-control study 27 1.99 (1.56–2.53) <0.001 89
 Diagnostic method

 
of pulmonary TB
   Medical record 8 2.26 (1.29–3.94) 0.004 99 0
   Imaging 3 2.13 (1.16–3.92) 0.015 80
   Self-report or

   physical examination
22 1.96 (1.56–2.47) <0.001 66

* Since two separate cohorts were reported in one article, a total of 33 eligible cohorts were extracted and analyzed from 32 enrolled studies. Abbreviations: CI, confidence interval; No, Number; OR, odds ratio; TB, tuberculosis.

3. Pulmonary TB and Risk of Lung Cancer with High-Quality Studies

The analysis of eight high-quality studies showed a higher OR (2.26, 95% CI: 1.29–3.94, p = 0.004) than the analysis of all the studies. There was a high heterogeneity (I2 = 99%) with no publication bias, with Egger p = 0.621, and no visual asymmetry in the funnel plot (Figure 21B and Figure 32B). Of the eight articles, seven had cohorts from countries with a low TB burden, and only one had a cohort from a country with a medium TB burden. In the subgroup analysis with a TB burden, the medium-burden countries showed higher OR (4.18, 95% CI: 3.15–5.55, p < 0.001) than the low-burden countries (OR: 2.04, 95% CI: 1.12–3.73, p = 0.020). Geographically, the East Asia and the Pacific region showed a more prominent risk (OR: 2.79, 95% CI: 1.21–6.39, p = 0.016) compared to the Europe and Central Asia regions (OR: 1.79, 95% CI: 0.67–4.77, p = 0.244) (Table 32).
Table 32. Meta-analysis of high-quality studies to assess the association between TB and lung cancer.
Subgroup No. of Studies OR (95% CI)
a,b: Two separate cohorts reported in one article. Study a was conducted in 1979–1986 (755 cases and 512 controls); study

A sItudy can be awarded a maximum of one star for each numbered item within the Selection and Outcome categories. A maximum of two stars can be given for Comparability.

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