THU085 Can Genetic Mutations And Molecular Markers Predict Recurrence In Adamantinomatous Or Papillary Craniopharyngiomas? A Systemic Review.

Disclosure: M. Nicholas: None. U. Mahfuza: None. A. De Ieva: None. M. Rodriguez: None. V.A. Preda: None. Craniopharyngiomas are rare, but clinically significant intracranial tumors. According to the WHO criteria, two clinicopathological subtypes, adamantinomatous (aCP) and papillary (pCP) (WHO 2021) are distinct entities([1]). They may have a poor prognosis due to their high recurrence rate and anatomical location. The association between surgical procedures and recurrence is well reported, however, a definitive predictive factor for recurrence based on tumor molecular markers has yet to be elucidated. The genetic mutations BRAF V600E and CTNNB1 are mutually exclusive to aCP and pCP respectively and their presence has been well documented (WHO). The expression of molecular markers ki67, p53, VEGF, PD-L1, pATM, RARγ, RARβ, CD166, CD133, E-Cadherins, FABP5, CRAPBII, Vimentins, CXCL12, CXCR4, MCM6 and DNA Topo II alpha have also all been found in populations of craniopharyngiomas, but the level of their expression and proliferation indices have not previously been clearly summarized in the literature as markers of recurrence. Aim: To perform a systematic review of the common genetic and molecular markers found in either adamantinomatous or papillary craniopharyngiomas and assessment of their impact on recurrence rate. Methods: MEDLINE, Embase, PubMed, Cochrane Library and Scopus electronic were searched in December 2022 using a search string with key words “craniopharyngioma”, “adamantinomatous”, “papillary”, “genetic mutation”, “molecular markers” and “recurrence”. The initial search resulted in 1105 studies. These studies were assessed against inclusion and exclusion criteria. Results: The final review included 26 studies that included 905 patients. Ki67, p53, PD-L1, CXCL12, CXCR4, RARγ FABP5, CRABPII, MCM6 and DNA Topo II alpha molecular markers and CTNNB1 and PTTG-1 gene mutations were found to have an association with an increase in recurrence of adamantinomatous craniopharyngiomas, while VEGF, TERTp, pATM, RARβ, CD166, CD133, E-Cadherins and Vimentins were not. Ki67, p53, PD-L1, FABP5, CRABPII, MCM6 and DNA Topo II alpha molecular markers and BRAF and PTTG-1 gene mutations were found to have an association with an increase in recurrence of papillary craniopharyngiomas, while TERTp, pATM were not. The association of other molecular markers and tumour recurrence, despite large scale studies, gave conflicting results. Conclusion: Our systematic review demonstrates that a multitude of molecular markers and genetic mutations are markers of recurrence or worsening clinicopathology. The identification of genetic mutations and expression of molecular markers and their role in the likelihood of recurrence in either adamantinomatous or papillary craniopharyngiomas provides insight into the potential for novel targets in future therapies. References: 1. Louis, D. N. (Ed.). (2021). WHO classification of tumours of the central nervous system WHO CNS5. WHO. Presentation: Thursday, June 15, 2023