White blood cells from mice that are naturally immune to cancer cured tumors in other mice and provided them with lifelong immunity to the disease, researchers reported Monday. The finding indicates the existence of a biological pathway previously unsuspected in any species. A small team of researchers is working to understand the genetic and immunological basis of the surprising phenomenon. Preliminary studies hint at the existence of a similar resistance in humans. Researchers hope that harnessing the biological process could lead to a new approach to treating cancer. But Dr. Zhen Cui of Wake Forest, whose team published the findings in the Proceedings of the National Academy of Science, said he expected rapid replication of the results because the findings were so clear-cut and easily observed. This is a truly remarkable phenomenon -- and it really needs confirmation from other institutions," he said. The team took white blood cells from the immune mice ... and injected them into mice already carrying a variety of tumors, some of which were extremely aggressive. In every case, the cancers were destroyed, even if the cells were injected at a point distant from the tumor. Healthy tissues were not affected. The mice that received the cells, furthermore, were protected from new tumors for the rest of their lives. The researchers have no idea how the immunity continues.