By Julie Steenhuysen

CHICAGO, Jan 9 (Reuters) - By restoring tiny bits of genetic material missing from breast tumors in mice, U.S. researchers said on Wednesday they were able to block the cancer's ability to spread.

The finding will help doctors make better treatment decisions and may give rise to a new way of halting the advance of breast cancer, said Dr. Sohail Tavazoie, an oncologist at Memorial Sloan-Kettering Cancer Center in New York.

"What's most important to us as cancer doctors is the concern that the cancer is going to come back," said Tavazoie, whose study appears in the journal Nature.

Tavazoie said the research will give doctors a better way to determine if a particular breast cancer tumor will spread and also add to the list of possible targets that could be used to make drugs that block genes that make cancers spread.


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