Testis Tümörlerinde Patofizyoloji, Risk Faktörleri ve Biyolojik Gelişim
Özet
Testis kanseri, erkeklerde görülen tüm kanserlerin %1-2'sini oluşturmakta olup, %95'i seminom ve nonseminomatöz testiküler germ hücreli tümörlerden (TGHT) meydana gelmektedir. Genellikle genç erişkinlik döneminde (15-34 yaş) ortaya çıkan bu tümörlerin patogenezi tam olarak aydınlatılamamış olsa da embriyogenezin erken evrelerinde primordial germ hücrelerinin farklılaşmasındaki duraksamalardan kaynaklandığı ve Germ Hücre Neoplazisi İn Situ (GHNIS) öncül lezyonundan geliştiği kabul edilmektedir. Hastalığın gelişiminde genetik, çevresel ve hormonal faktörler ortak rol oynamaktadır. En önemli risk faktörü inmemiş testis (kriptorşidizm) olup, dört kat artmış risk ile ilişkilendirilmektedir. Bunun yanı sıra, ailede veya kişide testis kanseri öyküsü bulunması (özellikle kardeşlerde 8-10 kat artış), testiküler mikrolitiazis, infertilite ve anormal semen parametreleri de riski belirgin şekilde artırmaktadır. Tümör biyolojisi açısından, gebeliğin ilk üç ayındaki uterus içi olumsuz ortam, östrojen-androjen dengesizlikleri ve uygunsuz DNA metilasyonu gibi epigenetik mekanizmaların, yaşamın ilerleyen dönemlerinde malign dönüşümü tetiklediği düşünülmektedir.
Testicular cancer accounts for 1-2% of all cancers in men, with 95% consisting of seminomatous and non-seminomatous testicular germ cell tumors (TGCT). Although the pathogenesis of these tumors, which usually appear in young adulthood (ages 15-34), is not fully understood, it is accepted that they originate from developmental arrests of primordial germ cells during early embryogenesis and progress from Germ Cell Neoplasia In Situ (GCNIS). Genetic, environmental, and hormonal factors play a combined role in disease development. The most significant risk factor is an undescended testis (cryptorchidism), which is associated with a fourfold increased risk. Additionally, a personal or family history of testicular cancer (especially an 8-to-10-fold increase in brothers), testicular microlithiasis, infertility, and abnormal semen parameters significantly raise the risk. In terms of tumor biology, it is believed that adverse intrauterine environments during the first trimester, estrogen-androgen imbalances, and epigenetic mechanisms such as aberrant DNA methylation program and trigger malignant transformation later in life.
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