Article: Breast tumors grow faster in younger women, study says

Adding a disturbing twist to our understanding of breast cancer, researchers have a new explanation for the ineffectiveness of mammograms in detecting many tumors in women under 50: Tumors in younger women grow much more rapidly.

The new study, published in today's issue of the Journal of the American Medical Association, tracked 28,000 women who received mammograms over a seven-year period to see what kind of tumors they developed and when.

They found that mammograms, or breast X-rays, detected 75 percent of cancers in women in their 40s but 93 percent in women over 50. They also observed that the tumors in the under-50 women grew much faster than those in older women.

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