The process eliminated human melanoma and prostate cancers in the tested mice. The first trials in people are planned for next year. Drugs that inhibit the growth of the blood vessels that feed cancer have received wide attention in recent years, though early results reported last spring showed less promise than had been hoped for. The new therapy, developed by researchers Alan Garen and Zhiwei Hu at Yale University, takes a different approach, attacking the cells lining the blood vessels in tumors rather than trying to prevent the growth of new blood vessels.