Which subtype of classical Hodgkin lymphoma is most common and is strongly associated with EBV infection?

Explanation

## EBV Association and Subtype Distribution in cHL **Key Point:** Mixed cellularity Hodgkin lymphoma (MC-HL) shows the strongest association with EBV infection, particularly in developing countries and immunocompromised patients. However, nodular sclerosis is the most common subtype overall. ### Classical Hodgkin Lymphoma Subtypes | Subtype | Frequency | EBV Association | Stage at Diagnosis | Geographic Pattern | | --- | --- | --- | --- | --- | | **Nodular Sclerosis** | 60–70% | Weak (10–40%) | Early (I–II) | Developed countries | | **Mixed Cellularity** | 15–25% | Strong (75–95%) | Advanced (III–IV) | Developing countries | | **Lymphocyte-Rich** | 5% | Weak | Early | Rare | | **Lymphocyte-Depleted** | <5% | Variable | Advanced | Rare | ### EBV and Mixed Cellularity HL 1. **EBV Positivity:** 75–95% of cases, especially in developing nations and HIV+ patients. 2. **Mechanism:** EBV-driven proliferation of neoplastic cells; latency type II or III. 3. **Clinical Significance:** Associated with older age, advanced stage, and worse prognosis if untreated. 4. **Geographic Variation:** Highest in Central America, Africa, and Southeast Asia. **High-Yield:** Nodular sclerosis is the most common subtype worldwide (60–70%), but mixed cellularity has the strongest EBV link and is more common in resource-limited settings. **Mnemonic:** **"MC-HL = Most EBV-driven"** — Mixed Cellularity shows the strongest EBV association. **Clinical Pearl:** In a young patient from a developed country with early-stage HL, think nodular sclerosis. In an older patient from a developing country or an HIV+ patient with advanced HL, think mixed cellularity with EBV+.