The most common lung cancer seen in non-smokers is?

Appeared in: AIIMS Patna NO - 2020

Explanation

Adenocarcinoma is the most prevalent type of lung cancer in individuals who have never smoked, accounting for the majority of cases in this population.
It is a type of non-small cell lung cancer (NSCLC) that typically develops in the peripheral (outer) regions of the lungs.
This cancer type is more common in women and is often associated with specific genetic mutations (e.g., EGFR mutations) that can be targeted with specific therapies.

Option A: Small cell carcinoma has the strongest association with heavy cigarette smoking. It is extremely rare in individuals who have never smoked.
Option C: Large cell carcinoma is an undifferentiated non-small cell lung cancer that is also strongly associated with a history of smoking.
Option D: Squamous cell carcinoma is very strongly linked to smoking. It typically arises centrally in the larger bronchi.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Types of lung cancer and their association with smoking status as background academic context rather than a clinical decision trigger.
Understanding the different histologies of lung cancer is crucial for nurses as it impacts patient education, prognosis, and treatment options. For example, adenocarcinomas in non-smokers often have targetable mutations (like EGFR), making them eligible for specific oral medications rather than traditional chemotherapy.
Nurses must advocate for and educate on the importance of investigating respiratory symptoms like a persistent cough or dyspnea in all patients, regardless of their smoking history.
This knowledge helps in dispelling the misconception that lung cancer is exclusively a 'smoker's disease', reducing stigma and encouraging earlier diagnosis in non-smokers.

How to Approach the Question

First, identify the key concepts in the question: 'most common', 'lung cancer', and the specific patient population, 'non-smokers'.
This is a factual recall question testing your knowledge of cancer epidemiology.
Systematically review the options and recall their primary risk factors.
Associate Small cell carcinoma and Squamous cell carcinoma very strongly with smoking.
Recognize that Large cell carcinoma is also linked to smoking.
By elimination, and by recalling its specific epidemiology, identify Adenocarcinoma as the type that is least associated with smoking and therefore the most common in non-smokers.

Concept Tested & Keywords

QkN3dZ0hyUXxHSDhV3uawU

E6 Pathology- ROBBINS & COTRAN PATHOLOGIC BASIS OF DISEASE 10TH Ed p. 719-721

E6 PATHOLOGY QUICK REVIEWBased on Harsh Mohan Textbook of PATHOLOGY p. 180-182

E6 Pathology-Textbook of PATHOLOGYHarsh Mohan Part 2 (215-514) p. 73-75

Practise the full AIIMS Patna NO - 2020

Attempt every question from this paper in a timed mock, then review the full solution for each one.