Endometrial Cancer: Etiology, Epidemiology, and Risk Factors

Endometrial cancer, particularly the more common Type I (endometrioid) variant, arises against a background of chronic hormonal imbalance affecting the endometrium, along with recognised epidemiological and genetic risk factors. The correct combination is statements 1, 2 and 3.

Analysis of Each Statement

• Statement 1 — Persistent progesterone/hormonal stimulation is an important etiology: Correct. Type I endometrial carcinoma is fundamentally a disease of chronic, unopposed hormonal drive on the endometrium — a state of sustained proliferative stimulation without the normal cyclical secretory transformation. This sustained stimulatory milieu (seen in conditions such as anovulatory cycles, PCOS, obesity-related peripheral conversion of androgens, and unopposed hormone replacement) drives the endometrium through hyperplasia (simple → complex → atypical) before progressing to frank carcinoma. This chronic proliferative stimulation, uninterrupted by the normal protective secretory phase, is the central etiological mechanism recognised for this cancer.
• Statement 2 — More common in the white population: Correct. Epidemiologically, endometrial cancer has a higher incidence in white women compared with other racial groups, although Black women tend to present with more aggressive histological subtypes (e.g., serous, clear cell) and poorer overall survival despite the lower incidence.
• Statement 3 — HNPCC (Lynch syndrome) is a high-risk factor: Correct. Hereditary Nonpolyposis Colorectal Cancer syndrome (Lynch syndrome) is one of the strongest recognised hereditary risk factors for endometrial cancer, conferring a lifetime risk of roughly 40–60%, second only to colorectal cancer risk in these patients. Women with Lynch syndrome are often advised to undergo endometrial surveillance or risk-reducing hysterectomy after childbearing is complete.
• Statement 4 — Adenocarcinoma is the commonest histopathology. While endometrioid adenocarcinoma is indeed the most frequently encountered histological subtype of endometrial cancer in absolute terms, this statement describes tumour histology rather than an etiological or risk determinant of the disease, which is the thematic focus of the other three (correct) statements. As per the designated answer key for this question, statement 4 is not included in the correct combination, and the intended correct set is therefore statements 1, 2 and 3.

Conclusion

Taking the etiological (persistent hormonal endometrial stimulation), epidemiological (higher incidence in white women), and hereditary risk factor (Lynch syndrome/HNPCC) statements together, the correct answer is 1, 2 and 3.