Warren symposium follows legacy of geneticist giant

If we want to understand how the brain creates memories, and how genetic disorders distort the brain’s machinery, then the fragile X gene is an ideal place to start. That’s why the Stephen T. Warren Memorial Symposium, taking place November 28-29 at Emory, will be a significant event for those interested in neuroscience and genetics. Stephen T. Warren, 1953-2021 Warren, the founding chair of Emory’s Department of Human Genetics, led an international team that discovered Read more

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Tracing the start of COVID-19 in GA

At a time when COVID-19 appears to be receding in much of Georgia, it’s worth revisiting the start of the pandemic in early 2020. Emory virologist Anne Piantadosi and colleagues have a paper in Viral Evolution on the earliest SARS-CoV-2 genetic sequences detected in Georgia. Analyzing relationships between those virus sequences and samples from other states and countries can give us an idea about where the first COVID-19 infections in Georgia came from. We can draw Read more

epithelioid hemangioendothelioma

Genetic alteration opens door to targeted treatment of rare tumor

A cross section of an epithelioid hemangioendothelioma

Emory pathologist Sharon Weiss, MD, was the first to describe an extraordinarily rare tumor known as an epithelioid hemangioendothelioma (EHE). Thirty years later, researchers have identified a genetic alteration linked to this odd vascular tumor.

It’s hoped this newfound information will lead to a better understanding of the mechanisms underlying the development of this tumor and hence development of a targeted treatment. None yet is available. However, these findings already have been used to develop a new diagnostic test for this blood vessel disease.

The research, published in a recent issue of Science Translational Medicine, was done in collaboration with Cleveland Clinic’s Taussig Cancer Institute and led by Brian Rubin, MD, PhD, of Cleveland Clinic’s Pathology and Laboratory Medicine Institute and Lerner Research Institute.

The genetic alteration formerly in question involves a translocation between chromosomes 1 and 3, where chromosomes 1 and 3 exchange DNA fragments that are transposed onto opposite chromosomes. The result: the swapped DNA encodes a unique, fused gene that contains components from each chromosome. Because genes are translated into proteins, the result of this unique gene is a correspondingly unique protein, one thought to cause cancer.

Epithelioid hemangioendotheliomas comprise less than one percent of all cancers. Roughly 100 new cases are diagnosed in the United State each year. EHE are eccentric in their epidemiology, structure and aggressiveness. Slow to metastasize, they tend to occur in both young men and women when soft tissue is involved but occur mostly in women when the liver and lungs are affected.

However, it’s their peculiar structure that has so far made targeted treatment problematic, especially in the liver and lungs. “Instead of being one mass as you might expect with liver cancer, the patient with EHE often presents with little nodules throughout the liver,” says Weiss.

“The reason this occurs is that the growth starts in the liver’s portal vein, grows along its length, and then tracks out through the vessels. The growths blister out from the vessel creating these little nodules. Epithelioid hemangioendothelioma don’t possess the classic features of vascular tumors. In fact, EHE may have so many sites of involvement that the cancer can’t be cured, short of transplantation.”

Using EHE tissue samples gleaned from Weiss’s vast library, Rubin developed a genetic probe to detect the distinct chromosomal translocations in the tumor. The probe now serves as a powerful diagnostic tool of EHE and opens the door to understanding these tumors’ mechanisms.

“Once you understand the mechanism behind it, you can start trying to target those pathways in a therapeutic way,” says Weiss.

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