## Histological Types of Cervical Cancer **Key Point:** Squamous cell carcinoma (SCC) accounts for approximately 80–85% of all cervical cancers globally, making it the most common histological type. ### Distribution of Cervical Cancer Histology | Histological Type | Frequency | HPV Association | 5-Year Survival | | --- | --- | --- | --- | | Squamous cell carcinoma | 80–85% | HPV 16, 18 (high-risk) | 65–70% | | Adenocarcinoma | 10–15% | HPV 16, 18 | 55–60% | | Adenosquamous | 3–5% | HPV 16, 18 | 40–50% | | Small cell / neuroendocrine | 1–2% | Variable | <20% | | Melanoma | <1% | No HPV | Very poor | **High-Yield:** SCC arises from the squamous epithelium of the ectocervix and is strongly associated with persistent infection by high-risk HPV types (16 and 18), which account for ~70% of all cervical cancers. ### Clinical Pearl **Clinical Pearl:** Adenocarcinomas of the cervix are increasing in incidence relative to SCC in developed countries, partly because screening programs (Pap smear, HPV testing) are more effective at detecting SCC precursors (CIN) than adenocarcinoma precursors (AIS). However, SCC remains the global leader. ### Prognostic Implications - **SCC:** Better prognosis than adenocarcinoma; responds well to radiation and chemotherapy. - **Adenocarcinoma:** Worse prognosis; often diagnosed at a later stage; less radiosensitive than SCC. - **Small cell / neuroendocrine:** Rare, aggressive, poor prognosis; requires chemotherapy-based regimens (not radiation alone). [cite:Robbins 10e Ch 22]
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