1. Takiguchi, Y., Sekine, I., Iwasawa, S., Kurimoto, R. & Tatsumi, K. Chronic obstructive pulmonary disease as a risk factor for lung cancer. World J. Clin. Oncol. 5, 660–666. https://doi.org/10.5306/wjco.v5.i4.660 (2014).
2. Mathers, C. D. & Loncar, D. Projections of global mortality and burden of disease from 2002 to 2030. PLoS Med. 3, e442. https:// doi.org/10.1371/journal.pmed.0030442 (2006).
3. World health organization fact sheets; Fact sheets on cancer from IARC Updated March 2019. https://www.who.int/news-room/ fact-sheets/detail/cancer. Accessed 10 July 2021.
4. Koshiol, J. et al. Chronic obstructive pulmonary disease and altered risk of lung cancer in a population-based case–control study. PLoS ONE 4, e7380. https://doi.org/10.1371/journal.pone.0007380 (2009).
5. Turner, M. C., Chen, Y., Krewski, D., Calle, E. E. & Tun, M. J. Chronic obstructive pulmonary disease is associated with lung cancer mortality in a prospective study of never smokers. Am. J. Respir. Crit. Care Med. 176, 285–290. https://doi.org/10.1164/ rccm.200612-1792OC (2007).
6. Congleton, J. & Muers, M. F. Te incidence of airfow obstruction in bronchial carcinoma, its relation to breathlessness, and response to bronchodilator therapy. Respir. Med. 89, 291–296. https://doi.org/10.1016/0954-6111(95)90090-x (1995).
7. Loganathan, R. S., Stover, D. E., Shi, W. & Venkatraman, E. Prevalence of COPD in women compared to men around the time of diagnosis of primary lung cancer. Chest 129, 1305–1312. https://doi.org/10.1378/chest.129.5.1305 (2006).
8. Media, A. S., Persson, M., Tajhizi, N. & Weinreich, U. M. Chronic obstructive pulmonary disease and comorbidities’ infuence on mortality in non-small cell lung cancer patients. Acta Oncol. 58, 1102–1106. https://doi.org/10.1080/0284186X.2019.1612942 (2019).
9. Young, R. P. et al. COPD prevalence is increased in lung cancer, independent of age, sex and smoking history. Eur. Respir. J. 34, 380–386. https://doi.org/10.1183/09031936.00144208 (2009).
10. Wasswa-Kintu, S., Gan, W. Q., Man, S. F., Pare, P. D. & Sin, D. D. Relationship between reduced forced expiratory volume in one second and the risk of lung cancer: A systematic review and meta-analysis. Torax 60, 570–575. https://doi.org/10.1136/thx.2004. 037135 (2005).
11. Balata, H. et al. Spirometry performed as part of the Manchester community-based lung cancer screening programme detects a high prevalence of airfow obstruction in individuals without a prior diagnosis of COPD. Torax 75, 655–660. https://doi.org/10. 1136/thoraxjnl-2019-213584 (2020).
12. Decramer, M. & Janssens, W. Chronic obstructive pulmonary disease and comorbidities. Lancet Respir. Med. 1, 73–83. https://doi. org/10.1016/S2213-2600(12)70060-7 (2013).
13. Chung, K. F. Cytokines in chronic obstructive pulmonary disease. Eur. Respir. J. Suppl. 34, 50s–59s (2001).
14. Zeskind, J. E., Lenburg, M. E. & Spira, A. Translating the COPD transcriptome: Insights into pathogenesis and tools for clinical management. Proc. Am. Torac. Soc. 5, 834–841. https://doi.org/10.1513/pats.200807-074TH (2008).
15. Lee, G., Walser, T. C. & Dubinett, S. M. Chronic infammation, chronic obstructive pulmonary disease, and lung cancer. Curr. Opin. Pulm. Med. 15, 303–307. https://doi.org/10.1097/MCP.0b013e32832c975a (2009).
16. O’Callaghan, D. S., O’Donnell, D., O’Connell, F. & O’Byrne, K. J. Te role of infammation in the pathogenesis of non-small cell lung cancer. J. Torac. Oncol. 5, 2024–2036. https://doi.org/10.1097/jto.0b013e3181f387e4 (2010).
17. Houghton, A. M., Mouded, M. & Shapiro, S. D. Common origins of lung cancer and COPD. Nat. Med. 14, 1023–1024. https://doi. org/10.1038/nm1008-1023 (2008).
18. Sekine, Y. et al. Association of chronic obstructive pulmonary disease and tumor recurrence in patients with stage IA lung cancer afer complete resection. Ann. Torac. Surg. 84, 946–950. https://doi.org/10.1016/j.athoracsur.2007.04.038 (2007).
19. Zhai, R., Yu, X., Shafer, A., Wain, J. C. & Christiani, D. C. Te impact of coexisting COPD on survival of patients with early-stage non-small cell lung cancer undergoing surgical resection. Chest 145, 346–353. https://doi.org/10.1378/chest.13-1176 (2014).
20. Celli, B. R. Pharmacological therapy of COPD: Reasons for optimism. Chest 154, 1404–1415. https://doi.org/10.1016/j.chest.2018. 07.005 (2018).
21. Tashkin, D. P. et al. A 4-year trial of tiotropium in chronic obstructive pulmonary disease. N. Engl. J. Med. 359, 1543–1554. https:// doi.org/10.1056/NEJMoa0805800 (2008).
22. Ichinose, M. et al. Te efcacy and safety of combined tiotropium and olodaterol via the Respimat (® ) inhaler in patients with COPD: results from the Japanese sub-population of the Tonado (® ) studies. Int. J. Chron. Obstruct. Pulmon. Dis. 11, 2017–2027. https://doi.org/10.2147/COPD.S110389 (2016).
23. O’Donnell, D. et al. Efects of combined tiotropium/olodaterol on inspiratory capacity and exercise endurance in COPD. Eur. Respir. J. 49, 1601348. https://doi.org/10.1183/13993003.01348-2016 (2017).
24. Maltais, F. et al. Dual bronchodilation with tiotropium/olodaterol further reduces activity-related breathlessness versus tiotropium alone in COPD. Eur. Respir. J. 53, 1802049. https://doi.org/10.1183/13993003.02049-2018 (2019).
25. Calverley, P. M. A. et al. Tiotropium and olodaterol in the prevention of chronic obstructive pulmonary disease exacerbations (DYNAGITO): A double-blind, randomised, parallel-group, active-controlled trial. Lancet Respir. Med. 6, 337–344. https://doi. org/10.1016/S2213-2600(18)30102-4 (2018).
26. Kubota, M. et al. Reference values for spirometry, including vital capacity, in Japanese adults calculated with the LMS method and compared with previous values. Respir. Investig. 52, 242–250. https://doi.org/10.1016/j.resinv.2014.03.003 (2014).
27. Vermeersch, K. et al. Azithromycin during acute chronic obstructive pulmonary disease exacerbations requiring hospitalization (BACE). A multicenter, randomized, double-blind, placebo-controlled trial. Am. J. Respir. Crit. Care Med. 200(7), 857–868. https:// doi.org/10.1164/rccm.201901-0094OC (2019).
28. Boschetto, P. et al. Occurrence and impact of chronic obstructive pulmonary disease in elderly patients with stable heart failure. Respirology 18(1), 125–130. https://doi.org/10.1111/j.1440-1843.2012.02264.x (2013).
29. Tanabe, N. et al. Infuence of asthma onset on airway dimensions on ultra-high-resolution computed tomography in chronic obstructive pulmonary disease. J. Torac. Imaging. 36(4), 224–230. https://doi.org/10.1097/RTI.0000000000000568 (2021).
30. Tanabe, N. et al. A homological approach to a mathematical defnition of pulmonary fbrosis and emphysema on computed tomography. J. Appl. Physiol. 131(2), 601–612. https://doi.org/10.1152/japplphysiol.00150.2021 (1985).
31. Vogelmeier, C. F. et al. Global strategy for the diagnosis, management, and prevention of chronic obstructive lung disease 2017 report GOLD executive summary. Am. J. Respir. Crit. Care Med. 195, 557–882. https://doi.org/10.1164/rccm.201701-0218PP (2017).
32. Singh, D., Brooks, J., Hagan, G., Cahn, A. & O’Connor, B. J. Superiority of “triple” therapy with salmeterol/futicasone propionate and tiotropium bromide versus individual components in moderate to severe COPD. Torax 63, 592–598. https://doi.org/10.1136/ thx.2007.087213 (2008).
33. Gao, Y. H. et al. Impact of COPD and emphysema on survival of patients with lung cancer: A meta-analysis of observational studies. Respirology 21(2), 269–279. https://doi.org/10.1111/resp.12661 (2016).
34. Izquierdo, J. L. et al. Impact of COPD in patients with lung cancer and advanced disease treated with chemotherapy and/or tyrosine kinase inhibitors. Int. J. Chron. Obstruct Pulmon. Dis. https://doi.org/10.2147/COPD.S68766 (2014).
35. Omote, N. et al. Impact of mild to moderate COPD on feasibility and prognosis in non-small cell lung cancer patients who received chemotherapy. Int. J. Chron. Obstruct. Pulmon. Dis. 12, 3541–3547. https://doi.org/10.2147/COPD.S149456 (2017).
36. Lau, J. K. et al. Inhibition of cholinergic signaling causes apoptosis in human bronchioalveolar carcinoma. Cancer Res. 73, 1328– 1339. https://doi.org/10.1158/0008-5472.CAN-12-3190 (2013).
37. Wu, C. H., Lee, C. H. & Ho, Y. S. Nicotinic acetylcholine receptor-based blockade: Applications of molecular targets for cancer therapy. Clin. Cancer Res. 17, 3533–3541. https://doi.org/10.1158/1078-0432.CCR-10-2434 (2011).
38. Higginson, I. J. et al. An integrated palliative and respiratory care service for patients with advanced disease and refractory breathlessness: A randomised controlled trial. Lancet Respir. Med. 2, 979–987. https://doi.org/10.1016/S2213-2600(14)70226-7 (2014).
39. Deepak, J. A., Ng, X., Feliciano, J., Mao, L. & Davidof, A. J. Pulmonologist involvement, stage-specifc treatment, and survival in adults with non-small cell lung cancer and chronic obstructive pulmonary disease. Ann. Am. Torac. Soc. 12, 742–751. https:// doi.org/10.1513/AnnalsATS.201406-230OC (2015).
40. Govindan, R. et al. Genomic landscape of non-small cell lung cancer in smokers and never-smokers. Cell 150, 1121–1134. https:// doi.org/10.1016/j.cell.2012.08.024 (2012).
41. Borghaei, H. et al. Nivolumab versus docetaxel in advanced nonsquamous non-small-cell lung cancer. N. Engl. J. Med. 373, 1627–1639. https://doi.org/10.1056/NEJMoa1507643 (2015).