Regarding small cell lung cancer (SCLC), all of the following statements are correct EXCEPT:

Question

Accepted Answer

C. It has a better overall prognosis than non-small cell lung cancer (NSCLC) when treated with platinum-based chemotherapy and radiation. ## Pathology of Small Cell Lung Cancer

### Origin and Histology
**Key Point:** SCLC arises from neuroendocrine (Kulchitsky) cells in the bronchial epithelium. Cells are small (10–15 μm), with scant cytoplasm, finely granular chromatin ('salt-and-pepper' pattern), and numerous mitoses. Electron microscopy reveals dense-core neurosecretory granules — a defining feature [cite:Robbins 10e Ch 15].

### Epidemiology and Risk Factors
**High-Yield:** SCLC accounts for 15–20% of all lung cancers and is **strongly associated with cigarette smoking** (>95% of cases). It is the most common paraneoplastic syndrome-associated lung cancer.

### Clinical Presentation and Staging
**Clinical Pearl:** SCLC is an aggressive tumor that typically presents at **advanced stage** (limited disease ~30%, extensive disease ~70% at diagnosis). Early lymphatic and hematogenous spread to mediastinal nodes, liver, brain, and bone is characteristic.

### Prognosis and Treatment Response
**Warning:** Despite initial chemosensitivity, SCLC has a **worse overall prognosis than NSCLC**. Five-year survival is ~7% overall (limited disease ~20%, extensive disease ~2%). While platinum-etoposide chemotherapy achieves high initial response rates (60–80%), relapse is common and median survival is only 9–11 months for limited disease and 4–6 months for extensive disease [cite:Harrison 21e Ch 111].

| Feature | SCLC | NSCLC |
| --- | --- | --- |
| **5-year survival** | ~7% | ~20% |
| **Stage at diagnosis** | 70% extensive | Mixed |
| **Chemotherapy response** | Initial high response | Variable |
| **Overall prognosis** | Worse | Better |

**Key Point:** The statement that SCLC has a better prognosis than NSCLC is **false** — it is the opposite. SCLC is one of the most aggressive human malignancies despite initial chemosensitivity.

Answer

A. It is strongly associated with cigarette smoking and accounts for approximately 15–20% of all lung cancers

Answer

B. It arises from neuroendocrine cells and shows dense-core neurosecretory granules on electron microscopy

Answer

D. It typically presents at an advanced stage (limited or extensive disease) due to early lymphatic and hematogenous spread

Regarding small cell lung cancer (SCLC), all of the following statements are correct EXCEPT:

Explanation

Pathology of Small Cell Lung Cancer

Origin and Histology

Epidemiology and Risk Factors

Clinical Presentation and Staging

Prognosis and Treatment Response

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Feature	SCLC	NSCLC
5-year survival	~7%	~20%
Stage at diagnosis	70% extensive	Mixed
Chemotherapy response	Initial high response	Variable
Overall prognosis	Worse	Better