A
technical defintion of cancer
" Any of various
malignant neoplasms characterized by the
proliferation of anaplastic cells that tend to
invade surrounding tissue and metastasize to new
body sites. "
Breast cancer is a cancer of breast tissue. Worldwide, it is the most common form of cancer in females, affecting, at some time in their lives, approximately one out of nine to thirteen women who reach age ninety in the Western world. It is the second most fatal cancer in women (after lung cancer), and the number of cases has significantly increased since the 1970s, a phenomenon partly blamed on modern lifestyles in the Western world.
source:
wikipedia.org