Objective: To identify and compare risk factors among endometrial cancer patients ≤40 years of age, postmenopausal women with the same malignancy and women ≤40 years without malignancy.
Design: Retrospective case-control study.
Setting: Athens University, department of obstetrics and gynecology of a tertiary hospital serving a mainly urban population.
Population: Endometrial cancer patients ≤40 years (study group, n = 40), postmenopausal women with the same malignancy (positive controls, n = 40) and women ≤40 (negative controls, n = 40) without endometrial cancer.
Methods: Clinical history, treatment and follow-up of patients were evaluated. Factors studied included age, histology, stage, grade, lymphovascular space involvement, body mass index (BMI), cytology, lymph node status, parity, smoking, family history, hypertension recurrence and survival.
Main outcome measures: Differences in risk factors and characteristics.
Results: Nulliparity, smoking and hypertension were significantly related with endometrial cancer in the study group compared to positive controls (p = 0.001, p < 0.01 and p < 0.001, respectively). BMI >30 significantly characterized patients in the study group compared to negative controls (p = 0.006). Finally, irregular menstruation and family history of cancer were observed more often in the study group compared to both control groups. Stage, grade, myometrial invasion, lymphovascular space involvement and lymph node status were comparable between the study and positive control groups.
Conclusion: Nulliparity, obesity, unstable menstruation, smoking and cancer in the family are strongly correlated with endometrial cancer risk in women ≤40 years.