This protein is correlated to breast cancer severity
The ZD2 attaches to and carries the fullerene ball. This particular peptide targets and attaches to a protein that is associated with breast cancer: extradomain-B fibronectin, also called EDB-FN.
EDB-FN is often found in the area around cancer cells, especially in the more aggressive types of breast cancer. A higher amount of EDB-FN is associated with more invasive tumors, cancer that is more likely to metastasize, and cancer that is resistant to drugs.
Generally, the more aggressive the breast cancer, the more EDB-FN is found.