WASHINGTON (Reuters) - Cancer experts who probed every gene in tumors from two of the hardest-to-treat cancers found that cancer is much more complicated than anyone thought -- and say they found why a cure is so unlikely after a tumor has spread.

But they also discovered a potential new way to treat a common and fatal form of brain cancer, and opened the door to finding cancer before it has spread, when it can still be cured surgically, they reported on Thursday in the journal Science.

"Cancer is very complex -- more complex than we had believed. It is not going to be easy to develop therapies," said Dr. Bert Vogelstein of Johns Hopkins University in Baltimore and the Howard Hughes Medical Institute.

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