Question

how does cancer occur????​

Answer 1

Answer :

What Causes Cancer?

There is no one single cause for cancer. Scientists believe that it is the interaction of many factors together that produces cancer. The factors involved may be genetic, environmental, or constitutional characteristics of the individual.

Diagnosis, treatment, and prognosis for childhood cancers are different than for adult cancers. The main differences are the survival rate and the cause of the cancer. The overall five-year survival rate for childhood cancer is about 80%, while in adult cancers the survival rate is 68%. This difference is thought to be because childhood cancer is more responsive to therapy and a child can tolerate more aggressive therapy.

Childhood cancers often occur or begin in the stem cells, which are simple cells capable of producing other types of specialized cells that the body needs. A sporadic (occurs by chance) cell change or mutation is usually what causes childhood cancer. In adults, the type of cell that becomes cancerous is usually an epithelial cell. Epithelial cells line the body cavity and cover the body surface. Cancer occurs from environmental exposures to these cells over time. Adult cancers are sometimes referred to as acquired for this reason.

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Answer 2

Answer:

$Cancer \: is \: a \:  disease \: caused \: when \: cells \: \\ divide \: uncontrollably \: and \: spread \: into \: surrounding \: \\ tissues. \: Cancer \: is \: caused \: by \: changes \: to \: DNA. \\ Most \: cancer-causing \: DNA \: \\ changes \: occur \: in \: sections \: of \: \\ DNA \: called \: genes.$

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