Some cancers seem to erupt out of ordinary breast issue with an awesome virulence , spreading rapidly throughout the body. Send us feedback. See more words from the same year Dictionary Entries near virulence virtute et armis Viru virucidal virulence virulency virulent viruliferous. Accessed 20 Jan. Keep scrolling for more More Definitions for virulence virulence. Please tell us where you read or heard it including the quote, if possible.
Virulence | Definition of Virulence by Merriam-Webster
These factors include early onset of menstruation , late onset of menopause , and factors that may allow breast tissue to be exposed to high levels of hormones for longer periods of time, such as later age at first pregnancy and never having given birth. In addition, pregnancy and breastfeeding have direct effects on breast cells, causing them to differentiate, or mature, so they can produce milk. Some researchers hypothesize that these differentiated cells are more resistant to becoming transformed into cancer cells than cells that have not undergone differentiation 2 , 3. Some pregnancy-related factors have been associated with a reduced risk of developing breast cancer later in life. These factors include:. A few retrospective case-control studies reported in the mids suggested that induced abortion the deliberate ending of a pregnancy was associated with an increased risk of breast cancer.