Breast cancer is a cancer of the breast tissue, which can occur in both women and men. Worldwide, breast cancer is the fifth most common cause of cancer death (after lung cancer, stomach cancer, liver cancer, and colon cancer). In 2005, breast cancer caused 502,000 deaths (7% of cancer deaths; almost 1% of all deaths) worldwide. Among women worldwide, breast cancer is the most common cancer and the most common cause of cancer death. In the United States, breast cancer is the third most common cause of cancer death (after lung cancer and colon cancer). In 2007, breast cancer is expected to cause 40,910 deaths (7% of cancer deaths; almost 2% of all deaths) in the U.S. Among women in the U.S., breast cancer is the most common cancer and the second most common cause of cancer death (after lung cancer). Women in the U.S. have 1 in 8 lifetime chance of developing invasive breast cancer and a 1 in 33 chance of breast cancer causing their death. The number of cases has significantly increased since the 1970s, a phenomenon partly blamed on modern lifestyles in the Western world.[5] Because the breast is composed of identical tissues in males and females, breast cancer also occurs in males, though it is less common.
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In biological psychology, awareness comprises a human's or an animal's perception and cognitive reaction to a condition or event. Awareness does not necessarily imply understanding, just an ability to be conscious of, feel or perceive. Awareness is a relative concept. An animal may be partially aware, may be subconsciously aware, or may be acutely aware of an event. Awareness may be focused on an internal state, such as a visceral feeling, or on external events by way of sensory perception. Awareness provides the raw material from which animals develop qualia, or subjective ideas about their experience. Researchers have debated what minimal components are necessary for animals to be aware of environmental stimuli, though all animals have some capacity for acute reactive behavior that implies a faculty for awareness. Popular ideas about consciousness suggest the phenomenon describes a condition of being aware of one's awareness. Efforts to describe consciousness in neurological terms have focused on describing networks in the brain that develop awareness of the qualia developed by other networks. Neural systems that regulate attention serve to attenuate awareness among complex animals whose central and peripheral nervous system provides more information than cognitive areas of the brain can assimilate. Within an attenuated system of awareness, a mind might be aware of much more than is being contemplated in a focused extended consciousness. When a patient goes for a surgical operation, it is desirable to temporarily make the patient unaware. Anaesthesiologists specialis
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