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Drug from Mediterranean weed kills tumor cells in mice
Date:7/9/2012

Scientists at the Johns Hopkins Kimmel Cancer Center, working with Danish researchers, have developed a novel anticancer drug designed to travel -- undetected by normal cells -- through the bloodstream until activated by specific cancer proteins. The drug, made from a weedlike plant, has been shown to destroy cancers and their direct blood supplies, acting like a "molecular grenade," and sparing healthy blood vessels and tissues.

In laboratory studies, researchers said they found that a three-day course of the drug, called G202, reduced the size of human prostate tumors grown in mice by an average of 50 percent within 30 days. In a direct comparison, G202 outperformed the chemotherapy drug docetaxel, reducing seven of nine human prostate tumors in mice by more than 50 percent in 21 days. Docetaxel reduced one of eight human prostate tumors in mice by more than 50 percent in the same time period.

In a report June 27 in the journal Science Translational Medicine, the researchers also reported that G202 produced at least 50 percent regression in models of human breast cancer, kidney cancer and bladder cancer.

Based on these results, Johns Hopkins physicians have performed a phase I clinical trial to assess safety of the drug and have thus far treated 29 patients with advanced cancer. In addition to Johns Hopkins, the University of Wisconsin and the University of Texas-San Antonio are participating in the trial. A phase II trial to test the drug in patients with prostate cancer and liver cancer is planned.

The drug G202 is chemically derived from a weed called Thapsia garganica that grows naturally in the Mediterranean region. The plant makes a product, dubbed thapsigargin, that since the time of ancient Greece has been known to be toxic to animals. In Arab caravans, the plant was known as the "death carrot" because it would kill camels if they ate it, the researchers noted.

"Our goal was to try to re-engineer
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Contact: Vanessa Wasta
wasta@jhmi.edu
410-955-1287
Johns Hopkins Medical Institutions
Source:Eurekalert

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