Alkilleyici Ajanların Klinik Kullanımları ve Yan Etki Yönetimleri

Yazarlar

Ece Bilgiç Köylü

Özet

Alkilleyici ajanlar, DNA’nın RNA’ya transkripsiyonunu engelleyerek protein sentezini durduran ve 60 yılı aşkın süredir kanser tedavisinde sıklıkla kombinasyon rejimlerinin bir parçası olarak kullanılan ilk antineoplastik ilaçlardır. Klinik kullanım alanları oldukça geniş olup; multipl miyelom, lenfomalar, lösemiler, sarkomlar ve glioblastomalar gibi çeşitli hematolojik maligniteler ile solid tümörlerin tedavisinde ve kök hücre transplantasyon hazırlık süreçlerinde kritik rol oynarlar. Bu ajanlar sitotoksik ve karsinojenik etkilere sahip olup, selektif olmayan özellikleri nedeniyle özellikle hematopoetik, reprodüktif ve endotelyal hücreler gibi hızlı bölünen sağlıklı hücrelerde belirgin hasara yol açarlar. Bu durumun klinik yansıması olarak doz kısıtlayıcı kemik iliği toksisitesi (miyolosupresyon, lökopeni), gastrointestinal sistem semptomları (bulantı, kusma, oral mukozit), hemorajik sistit gibi ciddi genitoüriner toksisite, gonad hasarı, pulmoner fibrozis, nörotoksisite ve tedavi ilişkili sekonder malignite riskinde artış gözlenir. Bu yan etkilerin yönetiminde ve organ hasarlarının kısıtlanmasında; agresif hidrasyon, mesna gibi spesifik koruyucu ajanlar, üçlü antiemetik tedaviler, profilaktik antiepileptikler ve kriyoprezervasyon yöntemleri gibi proaktif stratejiler ve doz ayarlamaları klinik başarıyı optimize etmek adına kritik öneme sahiptir.

Alkylating agents are the first discovered antineoplastic drugs that inhibit protein synthesis by preventing the transcription of DNA into RNA, and they have been frequently utilized as components of combination regimens in cancer treatment for over 60 years. Their clinical spectrum is remarkably broad, playing a critical role in treating various hematological malignancies and solid tumors—such as multiple myeloma, lymphomas, leukemias, sarcomas, and glioblastomas—as well as in conditioning regimens for hematopoietic stem cell transplantation. Possessing cytotoxic and carcinogenic properties, these non-selective agents cause pronounced damage primarily in rapidly dividing cells, including hematopoietic, reproductive, and endothelial cells. Consequently, their clinical use is associated with significant toxicities, including dose-limiting bone marrow suppression (leukopenia, thrombocytopenia), gastrointestinal complications (nausea, vomiting, oral mucositis), severe genitourinary side effects like hemorrhagic cystitis, gonadal toxicity, pulmonary fibrosis, neurotoxicity, and an elevated risk of treatment-related secondary malignancies. Managing these adverse effects and mitigating organ damage relies on proactive strategies and dose modifications, including aggressive hydration, specific cytoprotective agents like mesna, triple antiemetic therapy, prophylactic antiepileptics, and cryopreservation, all of which are essential to optimize therapeutic outcomes.

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21 Ocak 2023

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