What are the most common histologies of central primary lung cancer?

What are the most common histologies of central primary lung cancer?

• A. Squamous cell carcinoma and Small cell
• B. Adenocarcinoma and Large cell
• C. Carcinoid and Adenocarcinoma
• D. Small cell and Adenocarcinoma

Answer: (A)

Central primary lung cancers most often arise in the major airways, so the two histologies you’re most likely to encounter there are squamous cell carcinoma and small cell carcinoma. This pattern fits with their origins and behaviors: squamous cell carcinoma arises from the bronchial epithelium and is strongly linked to smoking, tending to grow right in the central bronchi and cause symptoms like coughing or coughing up blood. Small cell carcinoma also typically centers in the bronchi and is highly aggressive with early spread, again reflecting its neuroendocrine origin in the tracheobronchial tree. By contrast, adenocarcinoma, while the most common overall lung cancer, usually originates peripherally in the lung tissue rather than in the central airways. Large cell carcinoma is less common and not characteristically central, and carcinoid tumors can be central but are less frequent overall. Hence squamous cell carcinoma and small cell carcinoma are the best descriptors for central primary lung cancer.

Central primary lung cancers most often arise in the major airways, so the two histologies you’re most likely to encounter there are squamous cell carcinoma and small cell carcinoma. This pattern fits with their origins and behaviors: squamous cell carcinoma arises from the bronchial epithelium and is strongly linked to smoking, tending to grow right in the central bronchi and cause symptoms like coughing or coughing up blood. Small cell carcinoma also typically centers in the bronchi and is highly aggressive with early spread, again reflecting its neuroendocrine origin in the tracheobronchial tree. By contrast, adenocarcinoma, while the most common overall lung cancer, usually originates peripherally in the lung tissue rather than in the central airways. Large cell carcinoma is less common and not characteristically central, and carcinoid tumors can be central but are less frequent overall. Hence squamous cell carcinoma and small cell carcinoma are the best descriptors for central primary lung cancer.