Pregnancy causes extensive changes to the breasts, making breast cells less likely to multiply, and also less likely to develop tumours which could explain the protective effect of pregnancy for younger women.
If EDCs make breast cancer cells grow in the laboratory, for example, they may also affect breast cancer in women.
Furthermore, treatment with the synthetic MMP inhibitor, batimastat, has been shown to make breast cancer and lymphoma cells more prone to form liver metastases in mouse models (Kruger et al, 2001).
This pregnancy-induced protective effect resulted from structural and functional changes in breast and mesenchymal cells during pregnancy and pregnancy-promoted breast cell differentiation, both of which made breast epithelial cells less sensitive to carcinogenic agents [18].
For example, it was able to induce tumor necrosis factor related apoptosis-inducing ligand (TRAIL) in triple-negative breast cancer cells [ 20], which can explain how this DNMTi makes breast cancer cells sensitive to chemotherapeutic agents [ 21].
In another presentation, for example, Sumaiyah Rehman, a graduate student in the lab of Dihua Yu at M.D. Anderson Cancer Center in Houston, Texas, reported that miRNA-21 turns off a gene called PTEN that makes breast cancer cells resistant to Herceptin, a widely used drug.
As Rouzier et al also described, low tau expression renders microtubules more vulnerable to Paclitaxel and makes breast cancer cells hypersensitive to this drug.
Therefore, analyzing NAF breast fluid proteins and proteinases (like TF, uPA and PAI) we could obtain useful insights about mechanisms making breast ductal cells more prone to morphological and biomolecular alterations (like migration/adhesion, proliferation and stem differentiation) [ 69].
Light colors will make breasts appear larger.
Similar observations have been made for human breast cells [ 37].
