The Interactions of Obesity, Inflammation and Insulin Resistance in Breast Cancer.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing mechanistic concepts and expert hypotheses without original human data or systematic review methodology.
PubMed 26516917 · doi:10.3390/cancers7040883
What was done
Narrative review examining mechanistic and observational evidence on the interactions between obesity, type 2 diabetes, adipose tissue inflammation, and breast cancer risk and progression, focusing on aromatase induction, insulin signaling, and inflammatory cytokines.
What was found
The abstract provides no numerical data or effect sizes. It details qualitative biological mechanisms: insulin directly stimulates adipose aromatase activity, estrogen production, and breast cancer cell growth/invasion; macrophage-derived cyclooxygenase-2 (COX-2) and prostaglandin E2 induce aromatase expression; and animal model evidence shows proinflammatory cytokines and MCP-1 promote tumor proliferation, invasion, and angiogenesis across hormone-dependent and triple-negative subtypes.
Why it matters
It highlights that chronic adipose tissue inflammation and hyperinsulinemia, rather than BMI alone, may be the primary biological drivers of aggressive breast cancer development and progression.
Limits
Narrative review providing no original empirical data, quantitative effect estimates, or systematic search methodology in the abstract. Cited mechanistic pathways are largely derived from preclinical and animal models.
Cited by
- contradicts Elevated insulin directly inhibits the aromatase enzyme, impairing the conversion of testosterone into estrogens in the ovary.