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Marcos Devanir Silva da Costa, Nicole Cavalari Camargo, Patricia Alessandra Dastoli, Jardel Mendonça Nicácio, Frederico Adolfo Benevides Silva, Maria Luisa Sucharski Figueiredo, Michael Jenwei Chen, Andrea Maria Cappellano, Nasjla Saba da Silva, and Sergio Cavalheiro


Tumors of the CNS are the main causes of childhood cancer and have an incidence that exceeds that of leukemia. In addition, they are the leading causes of cancer-related death in childhood. High-grade gliomas account for 11% of such neoplasms and are characterized by aggressive clinical behavior and high morbidity and mortality. There is a lack of studies focusing on the factors that can prolong survival in these patients or guide therapeutic interventions. The authors aimed to investigate the factors related to longer survival durations, with a focus on reoperation for gross-total resection (GTR).


In this retrospective cohort study, the authors analyzed 78 patients diagnosed with high-grade gliomas occurring across all CNS locations except diffuse intrinsic pontine gliomas. Patients 0 to < 19 years of age were followed up at the Pediatric Oncology Institute. Overall survival (OS) and progression-free survival (PFS) were analyzed in the context of various prognostic factors, such as age, sex, histology, extent of tumor resection, reoperation for GTR, adjuvant treatment, and treatment initiation from 2010 onward.


With a mean age at diagnosis of 8.7 years, 50% of the patients were female and approximately 39% underwent GTR at some point, which was already achieved in approximately 46% of them in the first surgery. The median OS was 17 months, and PFS was 10 months. In terms of median OS, the authors found no significant difference between those with reoperation for GTR and patients without GTR during treatment. Significant differences were observed in the OS in terms of the extent of resection in the first surgery, age, sex, Ki-67 expression, adjuvant treatment, and treatment initiation from 2010 onward. Furthermore, the PFS values significantly differed between those with GTR in the first surgery and Ki-67 expression ≥ 50%.


This study demonstrates the importance of GTR for these neoplasms, highlights the role of surgeons in its achievement in the first attempt, and questions the role of reoperation for this purpose. Finally, this study further supports the use of combined adjuvant treatment for the improvement of OS and PFS.

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Maisa Yoshimoto, Sílvia Regina Caminada de Toledo, Nasjla Saba da Silva, Jane Bayani, Ana Paula Antunes Pascalicchio Bertozzi, Joã Norberto Stavale, Sergio Cavalheiro, Joyce Anderson Duffles Andrade, Maria Zielenska, and Jeremy A. Squire

Object. The purpose of this study was to examine chromosomal gains and losses in 11 pediatric adamantinomatous craniopharyngiomas by using comparative genomic hybridization (CGH), as well as to review the cytogenetic literature that has contributed to the characterization of these tumors. One source of confusion in the cytogenetic and CGH literature concerning craniopharyngioma is that the authors of most studies fail to distinguish between pediatric and later-onset forms of the disease. Thus, this study was focused on pediatric craniopharyngioma.

Methods. To determine an overview of the genetic events leading to the development of these tumors, 10 adamantinomatous craniopharyngiomas were analyzed using CGH; none of the tumor specimens demonstrated gains or losses of DNA sequence.

Conclusions. In view of these findings as well as those published in the majority of previous cytogenetic studies of craniopharyngiomas, the authors conclude that the recurrent acquisition of chromosomal imbalances does not play a major role in tumorigenesis and that chromosomal gains and losses are a relatively rare event in primary tumors of pediatric origin.