Cancer occurs when a single cell in your body acquires a set of random mutations in important genes that cause that cell to start to produce more and more and more copies of itself.
ﻳﺤﺪﺙ ﺍﻟﺴﺮﻃﺎﻥ ﻋﻨﺪﻣﺎ ﺗﻜﺘﺴﺐ ﺧﻠﻴﺔ ﻭﺍﺣﺪﺓ ﻓﻲ ﺟﺴﻤﻚ ﻣﺠﻤﻮﻋﺔ ﻣﻦ ﺍﻟﻄﻔﺮﺍﺕ ( ﺍﻟﺘﻐﻴﺮﺍﺕ) ﺍﻟﻌﺸﻮﺍﺋﻴﺔ ﻓﻲ ﺟﻴﻨﺎﺕ ﻫﺎﻣﺔ ﺗﺠﻌﻠﻬﺎ ﺗﺒﺪﺃ ﻓﻲ ﺍﻧﺘﺎﺝ ﻧﺴﺦ ﺃﻛﺜﺮ ﻭﺃﻛﺜﺮ ﻭﺃﻛﺜﺮ ﻣﻦ ﻧﻔﺴﻬﺎ