Breast cancer research at SBP
SBP is home to one of just seven National Cancer Institute (NCI)-designated basic cancer centers in the United States. Researchers in this center aim to preempt cancer before it develops, detect the disease at its earliest point, and eliminate its spread.
Kristiina Vuori, M.D., Ph.D. and
John C. Reed, M.D., Ph.D.
Historically, our scientists have made seminal contributions to breast cancer. Kristiina Vuori, M.D., Ph.D.
, now director of Sanford Burnham Prebys Medical Discovery Institute Cancer Center, and others published early findings on cellular communication networks in breast cancer cells. John C. Reed, M.D., Ph.D.
, now SBP CEO, and his laboratory made seminal contributions to the understanding of how certain proteins direct programmed cell death (a process called apoptosis) in breast cancer cells and how these proteins allow breast tumors to resistant chemotherapy.
While many researchers in SBP Cancer Center
study cellular growth and lifespan—work that impacts almost every type of cancer—our scientists are also pursuing several strategies for finding new treatments that specifically target breast cancer.
Here are a few current breast cancer studies at SBP:
Steering stem cells toward their better nature
Stem cells have the ability to differentiate into many different tissues of the body and play a critical role in regeneration and renewal. Growing evidence suggests that some tumors originate from stem cells. SBP researchers are searching for drugs that will force these errant stem cells to differentiate—that is, settle into a specific type of cell that no longer replicates uncontrollably. Rather than killing cancer cells, this approach would instead coax the stem cells that are driving a patient’s cancer to commit to a benign form.
Read more: Differentiation therapy—a different approach to treating tumors
Giving cancer drugs an address
Many treatments for cancer, such as chemotherapy, have serious side effects because they are toxic not only to cancer cells but healthy tissue as well. But what if cancer drugs could be directed to attack only the cancer cells that need killing? Several laboratories at SBP are developing peptides, or short proteins, that specifically bind only to cancer cells and the blood vessels that feed them. These peptides do this by recognizing specific molecular markers—vascular “zip codes”—that are found on tumor blood vessels but not normal vessels. These peptides can be used to direct cancer drugs precisely to the cells that need to be destroyed. One such peptide is called iRGD. When co-administered, iRGD and cancer drugs penetrate deeply into tumors. In mice, iRGD makes cancer drugs more effective, allowing researchers to use lower doses and therefore minimize side effects. Working with a biotechnology company and a major medical center, SBP researchers are now testing iRGD in humans.
Read more: Making cancer treatments better
Short-circuiting breast cancer tumors before they develop
A protein known as MELK is expressed at high levels in breast cancer, and SBP scientists have shown in studies with mice that MELK plays a role in the initiation and progression of mammary tumors. In other genetic experiments, the researchers demonstrated that inhibiting the expression of MELK slows the formation of tumors in mice. Researchers are now trying to learn exactly how MELK drives tumors. They are also searching for chemical inhibitors that might be able to stop the protein—potential precursors to new breast cancer therapies.
Read more: Got MELK?