https://www.cancerresearchuk.org/health-professional/cancer-statistics/statistics-by-cancer-type/lung-cancer#heading-Three
Increasing frequency of non-smoking lung cancer: Presentation of patients with early disease to a tertiary institution in the UK - PubMed (nih.gov)
https://pubmed.ncbi.nlm.nih.gov/22464348/
https://pubmed.ncbi.nlm.nih.gov/33677715/
https://pubmed.ncbi.nlm.nih.gov/31022354/
NICE guideline NG12. Suspected cancer: recognition and referral (updated August 2023)
https://journals.sagepub.com/doi/10.1177/0141076819843654
LUNG CANCER IN NEVER SMOKERS: CLINICAL EPIDEMIOLOGY AND ENVIRONMENTAL RISK FACTORS – PMC (nih.gov)
https://www.cancerresearchuk.org/about-cancer/lung-cancer/stages-types-grades/types
https://www.hopkinsmedicine.org/health/conditions-and-diseases/lung-cancer/lung-cancer-types
www.cdc.gov/cancer/lung/nonsmokers/index.htm#:~:text=About%2050%25%20to%2060%25%20of,the%20inside%20of%20the%20lungs
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5154547/#R1
https://www.healthline.com/health/lung-cancer/alk-postive-lung-cancer-what-to-know#alk-positive-lung-cancer
https://www.alkpositive.org/what-is-alk
https://www.egfrpositive.org.uk/what-is-egfr
https://www.lung.org/lung-health-diseases/lung-disease-lookup/lung-cancer/symptoms-diagnosis/biomarker-testing/egfr#:~:text=EGFR%2Dpositive%20lung%20cancer%20represents,minimal%20to%20no%20smoking%20history.