Kolorektal kanserlerde yüksek CD133 ekspresyonunun klinikopatolojik önemi

Kolorektal karsinomlarda (CRC) CD133 ekspresyonunun prognostik öneminin belirlenmesi hedeflendi. Materyal ve Metot: Süleyman Demirel Üniversitesi Patoloji Anabilim Dalı'nda tanı almış sporadik kolorektal kanserli 70 olguya ait CD133 ekspresyonları, parafin bloklarda immunohistokimyasal olarak araştırıldı. Neoplazik bezlerin % 50'sinden azında boyanma düşük pozitif; % 50 ve daha fazlasında boyanma yüksek pozitif imünoreaktivite olarak değerlendirildi. Ayrıca, patolojik parametreler ve sağ kalım oranları ile CD133 immünhistokimyasal ekspresyon düzeyleri arasındaki ilişki araştırıldı. Bulgular: CD133 ekspresyonu incelenen olguların % 82.9'unda tespit edildi ve yüksek CD133 düzeyi anlamlı (p = 0.004) derecede kötü hastalıksız sağkalım ile ilişkili bulundu. CD133 ifadesi rektosigmoid bölgede bulunan tümörlerde anlamlı (p = 0.005) derecede yüksekti ve histolojik grade ile anlamlı (p = 0.020) negatif korelasyon gösterdi. Sonuç: Daha önceden yayınlanmış verilerle uyumlu olarak muhtemelen tümörün kötü diferansiye alanlarındaki luminal bölgelerin eksikliğine bağlı olarak bu çalışmadaki kötü diferensiye tümörlerde yüksek CD133 pozitifliği belirlenmedi. Sonuçlarımız kötü hastalıksız sağkalım ile korelasyon gösteren immünohistokimyasal CD133 ekspresyonunun kolorektal karsinoma için bağımsız bir prognostik belirleyici (markır) olabileceğini göstermektedir. Bu çalışmanın bulguları, kanser kök hücre modelini desteklemekte ve CRC olgularında CD133'ün klinik önemini ve yüksek CD133 ekspresyonu ile hastalıksız sağkalım arasında güçlü bir ilişki olduğunu ortaya koymaktadır

Clinicopathologic significance of high CD133 expression in colorectal carcinomas

To investigate the prognostic significance of CD133 expression in colorectal carcinomas (CRC). Material and Method: CD133 expression was investigated immunohistochemically on the paraffin blocks of 70 sporadic colorectal carcinoma cases which were diagnosed at the department of pathology in Suleyman Demirel University. Low positivity was defined as positive immunoreactivity in < 50% of neoplastic glands, and high positivity was defined as positive immunoreactivity in >= 50% of neoplastic glands. Furthermore, the relation of CD133 immunohistochemical expression with pathologic parameters and survival rates were investigated. Results: CD133 expression was detected in 82.9% of the examined cases and high CD133 expression was significantly associated with poorer disease free survival (p=0.004). CD133 expression was significantly higher in tumors located in rectosigmoidal region (p=0.005) and showed a significant negative correlation with histologic grade (p=0.020). Conclusion: In the present study none of the poorly differentiated tumors showed high CD133 positivity probably due to the lack of luminal areas in poorly differentiated areas of the tumor, which is in consistence with the previously published data. Our results indicate that immunohistochemical CD133 expression, which correlates with poorer disease free survival, may be an independent prognostic marker in colorectal carcinoma. The findings of this study support the cancer stem cell model, and reveal the clinical importance of CD133 in CRC cases and present a strong association between high CD133 expression and disease-free survival

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