"Many times they work well with mice and they don't work well with humans," Folkman said.
He said he believes his work will eventually have a tangible result on cancer treatment.
"We're optimistic because of the animal work," Folkman said. "We do think that angiogenesis inhibitors will be added to chemotherapy."
A Maryland company, EntreMed Inc., is funding the clinical trials of 2ME2.
Mary Sundeen, a spokesperson for Entremed, said clinical testing of 2ME2 has returned encouraging data, suggesting that the drug may be effective in fighting multiple myeloma, an aggressive type of cancer.
"The data-driven process has led us to believe the angiogenesis mechanism may make 2ME2 good for myeloma," Sundeen said. Sundeen said it showed promise in treating breast cancer.
2ME2 has received much less media attention than Endostatin, a similar drug that is injected instead of taken orally.
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