Amaç: Atipik teratoid/rabdoid tümör (AT/RT), çocukluk çağı santral sinir sistemi (SSS) tümörlerinden olan embriyonel tümörlerin nadir bir alt grubunu oluşturmaktadır. 22q11.2'de lokalize SMARCB1/INI1 geninde somatik dokularda oluşan değişikliklerin (delesyon, nokta mutasyonu, heterozigosite kaybı), AT/RT'lerin yaklaşık %75-98'inde bulunduğu gösterilmiştir. Ayrıca AT/RT'li hastaların 1/3'ünde SMARCB1/INI1 geninde germline mutasyonlar bildirilmiştir. Bu çalışmada, AT/RT tanısı alan hastalarda bu tümör ile ilişkili bir tümör supresör gen olan SMARCB1/INI1 mutasyonlarının araştırılması amaçlanmıştır. Gereç ve Yöntemler: Bu çalışmada, 2010-2015 yılları arasında Ege Üniversitesi Tıp Fakültesinde, AT/RT tanısı almış olguların demografik, klinik, patolojik özellikleri ve SMARCB1/INI1 mutasyonları değerlendirildi. Olguların hepsinin tümör dokusuna ait patoloji preparatlarından ve ulaşılabilen olguların periferik kanlarından DNA izole edilerek, SMARCB1/INI1 geni için tüm ekzonik bölgeler polimeraz zincir reaksiyonu ile çoğaltıldı, jel elektroforezi ile kontrol edildikten sonra DNA dizi analizi gerçekleştirildi. Tespit edilen varyasyonların patojenitesi, Amerikan Tıbbi Genetik Koleji 2015 kriterlerine göre değerlendirildi. Bulgular: Çalışmaya alınan 10 hastanın 7'si SSS'nin AT/RT'si, 2'si yumuşak dokuda RT, biri renal RT tanılıydı. Hastaların %77'sinde tümör dokusunda immünohistokimyasal yöntemler ile SMARCB1/INI1 protein ekspresyonu kaybı saptandı ve bu hastaların ortanca sağkalım süresinin 5 ay (1-69 ay, SE: 9,29 ay) olduğu görüldü. Dört hastanın tümör dokusunda SMARCB1/INI1 geninde, mutasyon saptandı ve bu hastaların ortanca sağkalım süresi 5,5 ay (1-15 ay, SE: 2,95 ay) olarak saptandı. SMARCB1/INI1 geninde mutasyon saptanmayan hastaların ortanca sağkalım süresi 10,5 ay (1-81 ay, SE: 14,6 ay) olarak saptandı. Sonuç: Tümör dokusunda SMARCB1/INI1 geninde mutasyon saptanan hastaların ortanca sağkalım sürelerinin, mutasyon saptanmayanlara göre daha kısa olduğu gözlenmiştir. Önceki yayınlardan farklı olarak AT/RT tanılı hasta grubumuzda, hiçbir hastada SMARCB1/INI1 geninde germline mutasyon saptanmamıştır.
Anahtar Kelimeler: Santral sinir sistemi neoplazileri; tümör baskılayıcı genler; SMARCB1 protein; rabdoid tümör
Objective: Atypical teratoid/rhabdoid tumor (AT/RT) is a rare subgroup of embryonal tumors of childhood central nervous system (CNS) tumors. It has been reported that approximately 75-98% of patients with AT/RT have somatic changes (deletion, point mutation, loss of heterozygosity) in the SMARCB1/INI1 gene localized in 22q11.2 and also one-third of the patients have germline mutations. This study aimed to investigate the SMARCB1/INI1 mutations, a tumor suppressor gene associated with this tumor, in patients with AT/RT. Material and Methods: The demographic, clinical, pathological features and SMARCB1/INI1 mutations of patients diagnosed at Ege University between 2010-2015 were evaluated. DNA was isolated from pathological preparations of tumor tissue of all cases and peripheral blood of accessible patients, and all exonic regions for the SMARCB1/INI1 gene were reproduced by polymerase chain reaction, and DNA sequence analysis was performed after control by gel electrophoresis. Pathogenicity of the variations found was evaluated according to American College of Medical Genetics 2015 criteria. Results: 7/10 patients were diagnosed as AT/RT of CNS, 2/10 as soft tissue RT, and 1/10 as the renal RT. In 77% of the patients, loss of SMARCB1/INI1 protein expression was detected by immunohistochemical methods in tumor tissue and mean survival was 5 months (1-69 months, SE: 9.29 months). The mutation was detected in SMARCB1/INI1 in tumor tissue of four patients and median survival was 5.5 months (1-15 months, SE: 2.95 months). The median survival of patients without a mutation in the SMARCB1/INI1 gene was found to be 10.5 months (1-81 months, SE: 14.6 months). Conclusion: The median survival time of the patients with SMARCB1/INI1 mutation seems to be shorter than the ones without the mutation. Unlike previous publications, in our patient group diagnosed as AT/RT, no germline mutation was detected in the SMARCB1/INI1 gene.
Keywords: Central nervous system neoplasms; tumor suppressor genes; SMARCB1 protein; rhabdoid tumor
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