Body fat distribution and uterine leiomyomas

Area of Science:

• Gynecologic Oncology
• Endocrinology
• Metabolic Health

Background:

• Uterine leiomyomas are common benign gynecological tumors.
• The etiology of uterine leiomyomas is multifactorial, with increasing interest in metabolic factors.
• Obesity is a potential risk factor, but its specific relationship with body fat distribution requires further investigation.

Purpose of the Study:

• To investigate the etiological relationship between body fat composition and uterine leiomyomas.
• To identify specific body fat phenotypes associated with an increased risk of developing uterine leiomyomas.

Main Methods:

• A case-control study was conducted in Sapporo City, Japan.
• One hundred women diagnosed with uterine leiomyomas and 200 controls without leiomyomas were recruited.
• Body fat percentage was measured using bioelectrical impedance analysis; body mass index (BMI) and waist-to-hip ratio were also assessed.

Main Results:

• The 'occult obesity' phenotype (BMI < 24.0 kg/m² and body fat percentage ≥ 30%) demonstrated the highest risk for uterine leiomyomas.
• A waist-to-hip ratio greater than 0.80 was significantly associated with an increased risk of uterine leiomyomas.
• No cases were identified in the 'muscular type' (BMI ≥ 24.0 kg/m² and body fat percentage < 30%).

Conclusions:

• Occult obesity, defined by normal BMI and elevated body fat, is a significant risk factor for uterine leiomyomas.
• Upper body fat distribution, indicated by a higher waist-to-hip ratio, may contribute to the development of uterine leiomyomas.
• These findings suggest that body composition and fat distribution play a crucial role in the pathogenesis of uterine leiomyomas.