Cancer is a group of diseases characterized by the uncontrolled growth and spread of abnormal cells. If the
spread is not controlled, it can result in death. Although the reason why the disease develops remains unknown
for many cancers, particularly those that occur during childhood, there are many known cancer causes,
including lifestyle factors, such as tobacco use and excess body weight, and non-modifiable factors, such as
inherited genetic mutations, hormones, and immune conditions. These risk factors may act simultaneously or
in sequence to initiate and/or promote cancer growth.