Sustentación Tesis de Grado Maestrante: MARÍA FERNANDA GUERRERO CRIOLLO.

Value of the Information & Strength of the Argument

The value of the information lies in providing epidemiological and molecular data on pediatric gliomas in Colombia, a region with limited data. The study’s findings on the frequency of genetic alterations, such as the lower-than-expected H3K27M mutation rate, contribute to the understanding of these tumors in Latin American populations. The argumentation is solid, as the presenter systematically presents the methodology, results, and discusses them in the context of existing literature. However, the study’s limitations, such as the small sample size and the use of WHO 2016 classification, are acknowledged and discussed, which strengthens the credibility of the conclusions.

Scientific Rigor, Source Quality, Title Accuracy

The scientific rigor is evident in the detailed methodology, including the use of tissue microarrays and standardized FISH protocols. The quality of sources is adequate, as the presenter references key literature and WHO classifications. The title accurately reflects the content of the presentation. The defense includes questions from evaluators, which are not shown in the transcript, but the presenter’s responses demonstrate a thorough understanding of the subject. No comments are provided for analysis.

The title accurately reflects the content: detection of genetic alterations in pediatric gliomas and association with clinical factors.

7/10

The thesis defense presents a retrospective study with a clear methodology, including histopathological and molecular analyses (IHC, FISH) on a cohort of 50 pediatric glioma patients. The study is limited by sample size and the use of WHO 2016 classification, but the methodology is sound and results are discussed in context of literature.

Markers derived by PSI from the transcript: the creator did not define chapters.

• 00:00Introduction and presentation of the thesis title and committee.
• 02:00Background on gliomas and their incidence in Colombia.
• 05:00Clinical presentation and diagnostic steps for CNS tumors.
• 10:00Genetic alterations in pediatric gliomas and their significance.
• 15:00Study objectives and methodology overview.
• 20:00Detailed methodology: tissue microarrays, IHC, and FISH techniques.
• 30:00Clinical and pathological characteristics of the 50 patients.
• 40:00Results of molecular analyses and specific cases.
• 50:00Discussion of findings and comparison with literature.
• 58:20Conclusions and final remarks.

• WHO Classification of Tumors of the Central Nervous System (2016) — Referenced for tumor classification and nomenclature.
• WHO Classification of Tumors of the Central Nervous System (2021) — Mentioned as updated classification, but not used for reclassification in this study.
• Glioma literature on H3K27M mutations — Referenced for expected frequencies and prognostic implications.
• KIAA1549-BRAF fusion literature — Referenced for expected frequency in pilocytic astrocytomas.

• WHO Classification of Tumors of the Central Nervous System (2016) — Used for tumor classification in the study.
• Literature on KIAA1549-BRAF fusion frequency — Concordant with the study's finding of fusion in pilocytic astrocytomas.

• Literature on H3K27M mutation frequency — The study found a lower frequency (8.7%) than the expected 45-50% in midline gliomas, possibly due to antibody specificity.