A new study has identified a key biological mechanism that explains why some cancer patients do not respond to certain targeted therapies. Researchers found that variations in a patient’s tumor microenvironment, specifically the activity of non-cancerous cells and the extracellular matrix, can create a protective barrier. This barrier prevents drugs from effectively reaching and attacking cancer cells, a process known as therapeutic resistance. The discovery, made through advanced genomic and imaging techniques, points to the need for personalized treatment approaches that account for these individual tumor characteristics. Future research will focus on developing combination therapies or new drugs that can overcome this barrier to improve patient outcomes. Read the full article at https://www.sciencedaily.com/releases/2026/03/260326075550.htm