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New way to determine whether metastatic cancer cells in breast cancer patients are dormant or soon to turn deadly

The researchers found that when cells from a breast cancer patient’s original tumor metastasized into the patient’s bone marrow with none, or only a small amount, of the protein NR2F1, the patients all soon died. However, patients who had a high concentration of NR2F1 in the cancer cells in their bone marrow did not frequently develop this type of metastatic cancer, and lived longer. The presence of a high concentration of NR2F1 induced dormancy in the cancer cells, essentially deactivating them, so this research shows that survival in these patients is due to the dormancy of the disseminated cancer.

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