David F. Stern PhD
Professor of Pathology; Associate Director, Shared Resources, Yale Cancer Center; Leader, Signal Transduction Research Program, Yale Cancer Center
Cancer Biology: signal transduction by HER2/ErbB2 and other EGF family receptor tyrosine kinases; EGF family receptors in breast cancer and mammary development; DNA damage checkpoint signaling; Functional and genetic analysis of cancer; Melanoma
The HER-2/Neu/ErbB-2 receptor tyrosine kinase is a major human oncogene and a validated therapeutic target in breast cancer. We are investigating the normal and carcinogenic functions of HER2 and other EGF receptor family kinases to understand how they cause cancers and how they can best be treated. We are also beginning to study the biology of other forms of breast cancer. This work includes use of cell biological, animal, and human models. Checkpoint controls are quality controls that supervise cell cycle progression and maintain genome stability. We are investigating signal transduction in yeast and human DNA checkpoint controls and the implications for cancer therapy. An important practical problem with new, targeted cancer therapies is linking patients to therapies that match the specific alterations in their cancers. We are pursuing high throughput genetic and proteomic approaches to this problem.
Extensive Research Description
1. The receptor tyrosine kinase ErbB2/HER2 drives 25% of breast cancers. This receptor is the target for two drugs in use for breast cancer treatment, Herceptin/Trastuzumab and Tykerb/Lapatinib. In order to understand why this receptor is so important in human cancer, and to improve therapeutic targeting of ErbB2/HER2, we investigate normal and pathological functions of this receptor in mammary tissue. Our work spans from fundamental studies on signal transduction to analysis of ErbB2 in human cancer. ErbB2 works in close partnership with other members of the EGF receptor (ErbB family) of tyrosine kinases, so we also study differential signaling by the three related receptors (EGF receptor [HER]), ErbB3 [Her-3], ErbB4[Her4).
2. Checkpoint controls function as quality controls that supervise cell cycle progression. Such controls are of great interest because of their role in cell cycle regulation, and because they are commonly altered in human cancer. We are investigating signal transduction in DNA checkpoint control pathways. This involves analysis of checkpoint signaling in both budding yeast and humans, with the focus on the double-strand DNA break response pathway encompassing tumor suppressor gene Atm and Chk2/Rad53, and mediator proteins NFBD1/MDC1, 53B1, BRCA1, and MCPH1.
3.The growing availability of cancer drugs that target receptors and other signaling proteins has created a need to develop integrated methods for best matching of patients to the appropriate target drugs. We are investigating use of DNA-based and functional approaches for predicting response to targeted therapies, in breast cancer and melanoma.