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Even tiny breast tumors can be aggressive and may require maximum therapy
Date:12/17/2007

SAN ANTONIO Breast tumors that are 1 centimeter in size or smaller no more than 0.4 inch in length can still be very aggressive and may require more intensive therapy than is routinely offered today, say researchers at Mayo Clinic in Jacksonville, Fla.

The study, which is being presented at the San Antonio Breast Cancer Symposium, is one of the few that has looked at outcomes of women who have tiny tumors that have not spread to the lymph nodes. The findings suggest that outcome of two types of breast cancer those classified as HER2 positive (HER2+) and triple negative may not depend on size alone.

This is a small study and so we cant make treatment recommendations from it, but it appears that biology and not only size matters when it comes to selecting therapy for small, invasive tumors, says the studys lead researcher, Surabhi Amar, M.D., a fellow in Hematology/Oncology at Mayo Clinic in Jacksonville.

Currently, there are no definitive treatment guidelines for tumors less than 1 centimeter in size because clinical trials are usually conducted on women whose tumors are larger or are associated with lymph node involvement, Dr. Amar says. We just dont have extensive data on tumors this small, so treatment becomes a matter of physician discretion.

Researchers at all three Mayo sites Jacksonville; Scottsdale, Ariz.; and Rochester, Minn. participated in the study, which examined 401 women who were treated for breast cancer between 2001 and 2005 at the breast cancer clinics in Jacksonville and Scottsdale.

The vast majority (87 percent, or 350 women) had tumors that were classified as ER/PR positive and HER2 negative (in short, HER2 negative/ER/PR+). Twenty-seven women (6.7 percent) had tumors that were HER2+ and 24 patients (5.9 percent) were diagnosed with triple negative cancer that is, ER/PR negative and HER2 negative. These classifications refer to receptors present on the outside of the tumor cell that are
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Contact: Paul Scotti
scotti.paul@mayo.edu
904-953-2299
Mayo Clinic
Source:Eurekalert

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