Dalilan Ciwon Daji
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Ciwon daji yana faruwa ne ta hanyar canje-canjen kwayoyin halitta wanda ke haifar da hadakar kwayoyin cuta marasa tsari da samuwar kari . Babban dalilin ciwon daji (wanda ba na iyali ba) shine lalacewar DNA[ana buƙatar hujja] da rashin zaman lafiya .[1] Kadan daga cikin cututtukan daji na faruwa ne saboda maye gurbi na gado.[2] Yawancin cututtukan daji suna da alaƙa da muhalli, salon rayuwa, ko fallasa ɗabi'a.[3] Ciwon daji gabaɗaya baya yaɗuwa a cikin ɗan adam, kodayake ana iya haifar dashi ta hanyar oncoviruses da kwayoyin cutar kansa . Kalmar " muhalli ", kamar yadda masu binciken ciwon daji ke amfani da ita, tana nufin duk wani abu da ke waje da jiki wanda ke hulda da mutane. [4] Yanayin bai iyakance ga yanayin yanayin halitta ba (misali fallasa abubuwa kamar gurɓatacciyar iska ko hasken rana), to amma kuma ya haɗa da yanayin rayuwa da halayen dabi'a.[5]
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![Thumb image](http://upload.wikimedia.org/wikipedia/commons/7/73/Cancer_requires_multiple_mutations_from_NIHen.png)
Fiye da kashi daya bisa uku na mutuwar ciwon daji a duk duniya (kuma kusan kashi 75-80 a cikin Amurka) ana kuma iya kaucewa ta hanyar rage fallasa ga abubuwan da aka sani.[6][7] Abubuwan muhalli na yau da kullun wadanda ke ba da gudummawa ga mutuwar kansa sun hada da fallasa ga sinadarai daban-daban da wakilai na jiki (amfani da taba yana da lissafin 25-30% na mutuwar cutar kansa), gurbataccen muhalli, abinci da kiba (30-35%), cututtuka (15-20%), da kuma radiation (duka ionizing da rashin ionizing, har zuwa 10%).[8] Wadannan abubuwan suna aiki, aqalla wani bangare, ta hanyar canza aikin kwayoyin halitta a cikin sel.[9] Yawanci yawancin irin waɗannan canje-canjen kwayoyin halitta ana buƙatar kafin ciwon daji ya taso.[9] An yi ta maimaita tsufa kuma akai-akai a matsayin muhimmin al'amari da za a yi la'akari da shi lokacin da ake kimanta abubuwan hadari don ci gaban ciwon daji na musamman. Yawancin canje-canjen kwayoyin halitta da na salula wadanda ke da hannu wajen hadaka ciwon daji suna taruwa yayin tsarin tsufa kuma a karshe suna bayyana kamar ciwon daji.[10]