Dataset Information

Homozygous loss of ADAM3A revealed by genome-wide analysis of pediatric high-grade glioma and diffuse intrinsic pontine gliomas.

ABSTRACT: Overall, pediatric high-grade glioma (pHGG) has a poor prognosis, in part due to the lack of understanding of the underlying biology. High-resolution 244 K oligo array comparative genomic hybridization (CGH) was used to analyze DNA from 38 formalin-fixed paraffin-embedded predominantly pretreatment pHGG samples, including 13 diffuse intrinsic pontine gliomas (DIPGs). The patterns of gains and losses were distinct from those seen in HGG arising in adults. In particular, we found 1q gain in up to 27% of our cohort compared with 9% reported in adults. A total of 13% had a balanced genetic profile with no large-scale copy number alterations. Homozygous loss at 8p12 was seen in 6 of 38 (16%) cases of pHGG. This novel deletion, which includes the ADAM3A gene, was confirmed by quantitative real-time PCR (qPCR). Loss of CDKN2A/CDKN2B in 4 of 38 (10%) samples by oligo array CGH was confirmed by fluorescent in situ hybridization on tissue microarrays and was restricted to supratentorial tumors. Only ?50% of supratentorial tumors were positive for CDKN2B expression by immunohistochemistry (IHC), while ?75% of infratentorial tumors were positive for CDKN2B expression (P = 0.03). Amplification of the 4q11-13 region was detected in 8% of cases and included PDGFRA and KIT, and subsequent qPCR analysis was consistent with the amplification of PDGFRA. MYCN amplification was seen in 5% of samples being significantly associated with anaplastic astrocytomas (P= 0.03). Overall, DIPG shared similar spectrum of changes to supratentorial HGG with some notable differences, including high-frequency loss of 17p and 14q and lack of CDKN2A/CDKN2B deletion. Informative genetic data providing insight into the underlying biology and potential therapeutic possibilities can be generated from archival tissue and typically small biopsies from DIPG. Our findings highlight the importance of obtaining pretreatment samples.

SUBMITTER: Barrow J

PROVIDER: S-EPMC3064619 | biostudies-literature | 2011 Feb

REPOSITORIES: biostudies-literature

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Homozygous loss of ADAM3A revealed by genome-wide analysis of pediatric high-grade glioma and diffuse intrinsic pontine gliomas.

Barrow Jennifer J Adamowicz-Brice Martyna M Cartmill Maria M MacArthur Donald D Lowe James J Robson Keith K Brundler Marie-Anne MA Walker David A DA Coyle Beth B Grundy Richard R

Neuro-oncology 20101207 2

Overall, pediatric high-grade glioma (pHGG) has a poor prognosis, in part due to the lack of understanding of the underlying biology. High-resolution 244 K oligo array comparative genomic hybridization (CGH) was used to analyze DNA from 38 formalin-fixed paraffin-embedded predominantly pretreatment pHGG samples, including 13 diffuse intrinsic pontine gliomas (DIPGs). The patterns of gains and losses were distinct from those seen in HGG arising in adults. In particular, we found 1q gain in up to ...[more]

PMID: 21138945

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Project description:Abstract Despite our increased understanding of the genetic make-up and new therapies for pediatric high grade glioma (pHGG) and Diffuse Intrinsic Pontine Glioma (DIPG) the outcome remains grim. Delta-24-RGD (DNX-2401 in the clinic) has been tested for adult glioblastoma presenting a safe profile and promising efficacy. The objective of this study was to evaluate the suitability of DNX-2401 as treatment for pHGG/DIPGs. Our results showed that DNX-2401 exerts a potent antitumor effect in pHGG (n=5) and DIPG (n=6) cell lines in vitro and in vivo. Our clinical trial experience with DNX-2401 in adult glioblastoma underscored the importance of the immune system in durable responses observed in patients. DNX-2401 administration in two DIPG immunocompent models was safe and without toxicity. DNX-2401 prolonged the overall survival, leading 20% to 80% of long-term survivors. Histologic examination showed that DNX-2401 stimulated T-cell infiltration (CD3+, CD4+ and CD8+; p<0.001) within the tumor. Esplenocytes from DNX-2401 treated-mice co-cultured with tumor cells significantly increase the IFNg production (p<0.0001). These outstanding preclinical results allowed us to open a phase I clinical trial for newly diagnosed DIPGs (NCT03178032) where the patients received an intratumoral viral injection followed by standard radiotherapy. Up to date 7 patients have been treated within the trial (3x1010viral particles in 1mL). The procedure was well tolerated and safe. Patients were home 3–4 days after the procedure. All the patients displayed a reduced tumor volume after combined treatment. In the next weeks, we will have information regarding the median survival. We are currently conducting molecular and functional studies to assess the response of the patients to the virus. Information acquired within this clinical study would aid to understand the response of DIPGs to viral therapies therefore to better tailor this strategy to improve the survival and the quality of life of pediatric brain tumor patients.

Dataset Information

Homozygous loss of ADAM3A revealed by genome-wide analysis of pediatric high-grade glioma and diffuse intrinsic pontine gliomas.

Publications

Homozygous loss of ADAM3A revealed by genome-wide analysis of pediatric high-grade glioma and diffuse intrinsic pontine gliomas.

Similar Datasets

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