Clinical Factors Associated with the Number of Gallbladder Polyps
Gallbladder polyps (GBPs), defined as pathological protrusions from the gallbladder mucosa, represent a significant clinical concern due to their potential implications for patient management and treatment. While single polyps are more frequently associated with malignant transformation risks, multiple polyps are generally considered benign. Understanding the factors influencing polyp multiplicity is critical for guiding clinical decisions. This study investigates the clinical and metabolic factors associated with the number of GBPs, focusing on demographic characteristics, lipid profiles, and metabolic syndrome (MS) components.
Study Design and Methodology
The retrospective analysis included 1,352 patients (826 males, 526 females) diagnosed with GBPs at Junan County People’s Hospital between January 2017 and December 2018. Diagnosis was confirmed via ultrasonography using standardized criteria: (1) mucosal protrusion into the gallbladder cavity, (2) fixed position unaffected by posture changes, (3) absence of posterior acoustic shadowing, and (4) presence or absence of a pedicle. Inclusion criteria required patients to be aged 19–90 years, asymptomatic, with polyp diameters <10 mm, and a diagnosis within the prior decade. Exclusion criteria included comorbidities (except viral hepatitis or diabetes), polyps ≥10 mm, or incomplete data.
Metabolic syndrome was defined as meeting ≥3 of the following: (1) body mass index ≥25 kg/m², (2) fasting blood glucose ≥6.1 mmol/L or diagnosed diabetes, (3) blood pressure ≥140/90 mmHg or treated hypertension, and (4) dyslipidemia (triglycerides ≥1.7 mmol/L or HDL-C <0.9 mmol/L in males/<1.0 mmol/L in females). Statistical analyses employed chi-square tests and logistic regression using SPSS 19.0, with significance set at P <0.05.
Key Findings
Demographic and Clinical Characteristics
Patients were stratified into single (1,002 patients, 74.11%) and multiple (350 patients, 25.89%) GBP groups. Gender emerged as a significant predictor, with females more likely to present with solitary polyps (χ²=5.3539, P=0.021). Logistic regression confirmed female gender as an independent risk factor for single GBPs (OR=1.496, 95% CI:1.106–2.024, P=0.009).
Lipid Profile Associations
Triglyceride (TG) levels exhibited a protective effect against single polyp formation. Hypertriglyceridemia (TG ≥2.3 mmol/L) was more prevalent in the multiple-polyp group (12.57% vs. 7.08%; χ²=10.0298, P=0.022), with logistic regression showing an inverse association between TG levels and solitary polyps (OR=0.845, 95% CI:0.730–0.978, P=0.024). Conversely, high-density lipoprotein cholesterol (HDL-C) levels were inversely correlated with multiple polyps. Normal HDL-C was more common in the single-polyp group (87.03% vs. 80.57%; χ²=7.4478, P=0.038), with low HDL-C increasing the likelihood of multiple GBPs (OR=0.603, 95% CI:0.384–0.947, P=0.028).
Metabolic Syndrome and Polyp Multiplicity
Metabolic syndrome prevalence was higher in patients with multiple GBPs (16.57% vs. 11.67%; χ²=5.5152, P=0.018), underscoring the role of metabolic dysregulation in polyp pathogenesis. Elevated glutamic oxaloacetic transaminase (GOT) levels were also associated with increased odds of single polyps (OR=1.035, 95% CI:1.011–1.058, P=0.003).
Pathophysiological Insights
The study highlights the distinct lipid-driven mechanisms underlying GBP multiplicity. Multiple polyps, often cholesterol-rich, are linked to bile cholesterol supersaturation and gallbladder wall lipid accumulation. These findings align with prior evidence showing cholesteryl esters and triglycerides as predominant lipids in cholesterol polyp pathology. The protective role of elevated TG levels against solitary polyps may reflect differences in lipid metabolism or gallbladder mucosal responses to systemic lipid profiles.
Clinical Implications
These results emphasize the importance of metabolic profiling in GBP management. Female patients and those with low TG or high HDL-C levels may require closer surveillance for solitary polyps due to their malignant potential. Conversely, metabolic syndrome components and dyslipidemia should prompt evaluation for multiple cholesterol polyps, which, though benign, may indicate underlying metabolic disturbances.
Limitations and Future Directions
The retrospective design and single-center data limit generalizability. Further studies should explore longitudinal associations between lipid metabolism, gallbladder mucosal dynamics, and polyp progression. Mechanistic research into gender-specific differences in GBP formation could clarify the role of hormonal or genetic factors.
Conclusion
This study identifies female gender, low triglycerides, and high HDL-C as independent predictors of solitary gallbladder polyps, while metabolic syndrome and dyslipidemia correlate with polyp multiplicity. These findings enhance risk stratification and inform personalized monitoring strategies for patients with GBPs.
doi.org/10.1097/CM9.0000000000001065
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