Breast cancer: why it is sometimes more aggressive after pregnancy

Name: Cancer du sein 🤰 les grandes découvertes
Uploaded: 2026-09-24T07:41:39+00:00
Description: Cancer du sein 🤰 les grandes découvertes

Published the 24 September 2026 By Sacha Tembe and Jeanne Fenouil

After pregnancy, the breast naturally regenerates. But some of the cells involved in this repair process may be hijacked by cancer cells. Researchers at the Institut Pasteur are exploring this mechanism to better understand the most aggressive forms of breast cancer.

#Cancer
#Pasteurdon

After pregnancy and breastfeeding, the breast undergoes changes to gradually return to its original state, a natural process of repair and reorganization of breast tissue. But researchers have discovered that certain cells involved in this repair process may play an unexpected role: hijacked by cancer cells, they may promote faster and more aggressive tumor growth.

This is the mechanism currently being studied by Aurélie Chiche, Lamia Djoual, and Han Li, researchers at the Institut Pasteur, in the hope of finding new ways to slow the development of certain breast cancers that are particularly difficult to treat.

Episode 4/5 of our series “5 Discoveries That Advance Research.” To help these researchers continue this vital work, please make a donation at Pasteurdon.fr