New study shows breast tumors evolve in response to hormone therapy

Analysis of single tumor sample inadequate to provide best treatment

Many breast tumors grow in response to female hormones, viagra sale especially estrogen. Drugs that reduce estrogen levels in the body often are effective in reducing tumor size and preventing recurrence of the cancer. But some tumors become resistant to these therapies and continue to grow and spread.

A new analysis of breast tumors, look before and after hormone-reduction therapy, viagra 40mg reveals the extreme genetic complexity of these tumors and the variety of responses that are possible to estrogen-deprivation treatments. The findings also suggest that analyzing a single sample of the breast tumor is insufficient for understanding how a patient should best be treated.

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