SORU: aşağıdaki parçaya göre cevaplayınız
We learn from the passage that cancer cells ----.
Cancer describes a class of diseases characterized by
the uncontrolled growth of aberrant cells. Cancers kill
by the destructive invasion of normal organs through
direct extension and spread to distant sites via the
blood, lymph, or serosal surfaces. The abnormal
clinical behaviour of cancer cells is often mirrored by
biologic aberrations such as genetic mutations,
chromosomal translocations, expression of fetal or
other discordant ontologic characteristics, and the
inappropriate secretion of hormones or enzymes. All
cancers invade or metastasize but each specific type
has unique biologic and clinical features that must be
appreciated for proper diagnosis, treatment and study.
About 1.2 million new cases of invasive cancer are
diagnosed each year in the United States, and about
500,000 people die annually of the disease. Cancer is
the second most deadly disease and is expected to
surpass heart disease early in the twenty-first century
to top that vicious list. Over the past half century, the
frequency of most cancers has been stable, but some
dramatic changes have taken place. Steady declines in
stomach and uterine cancer have occurred, the latter
undoubtedly due to routine cytologic screening for
cervical cancer. The cause of the decline in stomach
cancer is unknown. The most striking change has been
the increases in lung cancer in both men and women,
undoubtedly related to smoking.