What is the majority type of primary lung cancer?

What is the majority type of primary lung cancer?

• A. Non-small cell lung cancer
• B. Small cell lung cancer
• C. Carcinoid
• D. Mesothelioma

Answer: (A)

The main idea here is how lung cancers are categorized by histology, and the vast majority are non-small cell lung cancer. Non-small cell lung cancer makes up roughly 85% of primary lung cancers, spanning subtypes such as adenocarcinoma, squamous cell carcinoma, and large cell carcinoma. Small cell lung cancer, by contrast, accounts for about 10–15% and behaves more aggressively, with a different treatment approach. Carcinoid tumors are rare neuroendocrine tumors of the lung, and mesothelioma arises from the pleura, not the lung parenchyma, so they are not the majority. Because NSCLC is far more common and encompasses the main parenchymal lung cancers, it is the majority type.

The main idea here is how lung cancers are categorized by histology, and the vast majority are non-small cell lung cancer. Non-small cell lung cancer makes up roughly 85% of primary lung cancers, spanning subtypes such as adenocarcinoma, squamous cell carcinoma, and large cell carcinoma. Small cell lung cancer, by contrast, accounts for about 10–15% and behaves more aggressively, with a different treatment approach. Carcinoid tumors are rare neuroendocrine tumors of the lung, and mesothelioma arises from the pleura, not the lung parenchyma, so they are not the majority. Because NSCLC is far more common and encompasses the main parenchymal lung cancers, it is the majority type.