Medicii britanici au identificat o moleculă, numită TGF, care este produsă de corp ca răspuns la infecţii şi care provoacă multiplicarea celulelor suşă precanceroase, în defavoarea celor sănătoase. Celulele din sânge sunt produse în măduva osoasă. În leucemie, măduva osoasă începe să producă prea multe leucocite (celulele albe) şi, uneori, acestea nu-şi mai îndeplinesc funcţiile, înmulţindu-se continuu. În timp, aceste celule anormale ajung să înlocuiască celulele normale – leucocitele, hematiile şi trombocitele.
Cercetătorii au descoperit că la originea acestei transformări stă o mutaţie genetică – fuziunea a două gene -, care provoacă apariţia celulelor precanceroase şi care se produce în uter. Aceste celule cresc apoi în măduva osoasă, acţionând ca o bombă silenţioasă, care poate rămâne în organism fără a se declanşa până la 15 ani.
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