Saturday, February 11, 2012

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AcasăJurnalenicolae's blogDespre cancer - Mecanisme

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Despre cancer - Mecanisme

Cancerul este o categorie de boli caracaterizate printr-o diviziune necontrolată a celulelor şi capacitatea acestor celule de a invada alte ţesuturi din organism, fie prin creştere directă în ţesuturi adiacente (invazie) sau prin migraţia celulelor spre locuri mai îndepărtate în organism (metastază). Această creştere necontrolată este cauzată de anormalităţi în ADN, cum ar fi de exemplu mutaţii ale genelor care controlează înmulţirea celulelor. Una sau, frecvent, mai multe astfel de mutaţii pot duce la diviziunea şi înmulţirea necontrolată a celulelor şi formarea unei tumori. Tumora se poate referi la orice tumefiere (umflătură) anormală a unui ţesut din organism, putând fi malignă sau benignă. Doar tumorile maligne sunt capabile de a invada alte ţesuturi, capaciatate numită metastază.

Cancerul e caracterizat prin diverse simptome care depind de zona afectată şi caracterul tumorii. Un diagnostic definitiv necesită în general o examinare microscopică a ţesutului afectat, obţinut printr-o biopsie. După ce a fost diagnosticat, cancerul este în general tratat prin operaţie, chemoterapie şi/sau radioterapie. (Wikipedia)

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