DALLAS - April 1, 1999 - Investigators at UT Southwestern Medical Center at Dallas have developed a new way to isolate purified cancer cells - an important advance that will help unravel the mysteries of tumor biology and cancer development.

A major obstacle for studying the molecular changes characteristic of tumor cells is the presence of large numbers of nonmalignant cells within tumors. Current methods for isolation of purified tumor cells are cumbersome or permit limited numbers of assays.

Now a new simple method of preparing tissue samples, developed by a research team led by Dr. Adi Gazdar, UT Southwestern professor of pathology and associate director of the Nancy B. and Jake L. Hamon Center for Therapeutic Oncology Research, will aid molecular studies by permitting isolation of enriched purified epithelial cell populations that can be used for a wide range of molecular analyses.

The new method - Epithelial Aggregate Separation and Isolation (EASI) - is described in the April issue of Nature Medicine, and is applicable to almost all epithelial tumors, which constitute about 80 percent of human cancers.

"The new method is rapid and simple and can be used by any surgical pathology service to prepare samples for molecular profiling," said Gazdar. "Once samples have been prepared, they can be sent to a specialized laboratory for cell isolation and nucleic acid extraction and analyses."

Tumors are structures consisting of mixtures of several cell types. In some tumors the cancerous cells constitute a minority of the total cell population. The EASI Prep, as the preparation of epithelial specimens by the EASI method is called, allows researchers to distinguish and isolate subpopulations of tumor samples and to investigate the sequence of the multiple stages of cancer development.

EASI combines the use of a simple, rapid and inexpensive method of sample preparation with laser capture microdissection (LCM), a recent technological devel
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Contact: Heather Stieglitz
heather.stieglitz@email.swmed.edu
214-648-3404
UT Southwestern Medical Center
1-Apr-1999