TYPE I AND TYPE II ENDOMETRIAL CANCER—Endometrial carcinomas can be divided into two groups based on epidemiologic, clinical, morphologic, and genetic features:
TYPE I ENDOMETRIAL CANCER
- Younger patients: 40 to 60 years
- History of hyperestrinism, for example, chronic anovulation,
estrogen replacement therapy. - Associated with endometrial hyperplasia Grade I, nonmyoinvasive endometrioid carcinomas, usual type or main variants.
- ER–PR immunoreactivity
- Low Ki-67 labeling index
- Microsatellite instability, PTEN mutations, no p53 mutations
- Immunoreactivity of stromal cells for CD10
- Favorable prognosis following hysterectomy
TYPE II ENDOMETRIAL CANCER
- Older patients: 60 to 80 years
- No previous hyperestrinism
- Atrophic endometrium
- Often associated with a high-grade in situ lesion Grade III tumors, often of special types (serous, clear cell types),
- Lack of ER–PR p53 mutations, no microsatellite instability
- Unfavorable prognosis following hysterectomy
| Type I Endometrial carcinoma | Type II Endometrial carcinoma |
Morphologic types: ENDOMETRIOID CARCINOMA | Morphologic types: SEROUS AND CLEAR CELL CARCINOMA |
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