Princeton Engineering Study Reveals High-Fat Diets Trigger Invasive Structural Changes in Triple-Negative Breast Cancer

Princeton researchers find that fatty acids and cholesterol trigger "crab-like" growth in breast cancer tumors, promoting metastasis through gene activation.

By: AXL Media

Published: Apr 6, 2026, 8:57 AM EDT

Source: Information for this report was sourced from EurekAlert!

Dietary Fats Catalyze Morphological Shifts in Malignant Cells

New research from Princeton University has identified a mechanical link between high-fat nutrient environments and the increased invasiveness of aggressive breast cancer. By cultivating 3D model tumors and exposing them to human-like plasma enriched with various nutrients, scientists observed that triple-negative breast cancer—a variant notoriously resistant to standard treatments—undergoes a physical transformation when "fed" fatty acids and cholesterol. Unlike tumors in standard nutrient conditions, those exposed to high fats developed hollow, outward-reaching appendages that are characteristic of metastatic progression.

The Crab-Like Architecture of Metastatic Invasion

According to Celeste Nelson, the study’s principal investigator and a professor of bioengineering at Princeton, these structural changes are the primary drivers of cancer's spread. The formation of these "tendrils" allows the tumor to infiltrate normal surrounding tissues, eventually reaching lymphatic or blood vessels to escape to other parts of the body. While tumors fed high levels of insulin, glycerol, or ketones remained relatively compact, the high-fat models exhibited a "crab-like" expansion, a morphological shift that defines the most dangerous stages of the disease.

Genetic Triggers and Collagen Degradation

The research team identified a significant correlation between high-fat diets and the increased production of MMP1, a gene responsible for breaking down collagen. As the fat-enriched tumors grew, cells migrated away from the core and toward the leading edges, coinciding with a spike in MMP1 activity. The researchers hypothesize that the high-fat environment encourages the tumor to degrade its surrounding structural environment, creating a path of least resistance for invasive growth. This genetic response highlights a potential target for future therapeutic interventions aimed at inhibiting tumor expansion.