Abstract
Central nervous system (CNS) germ cell tumors (GCT) are a rare heterogeneous group of malignant tumors that present in children and young adults. CNS GCTs are classified based on their histology and immunohistochemical profile; they are divided into pure germinoma and nongerminomatous GCT (NGGCTs) with the latter including teratomas, yolk sac tumors, embryonal carcinoma, choriocarcinoma, and mixed GCTs. CNS GCTs typically occur in the midline, involving primarily the suprasellar and pineal region, with rare occurrence in the basal ganglia and thalamus. Clinical presentation varies based on tumor location and age. Patients with pineal tumors present with signs and symptoms of hydrocephalus, whereas vision loss and diabetes insipidus are common presenting features of suprasellar tumors. Diagnosis is usually made with a combination of magnetic resonance imaging (MRI) and the presence of tumor markers (beta-human chorionic gonadotropin [βhCG] and alpha-fetoprotein [AFP]) in the serum and/or cerebrospinal fluid (CSF). Biopsy is indicated for midline lesions with negative tumor markers in serum and CSF. The role for aggressive surgical resection at diagnosis is controversial in CNS GCTs, with the exception of mature and immature teratomas for which a maximal safe surgical resection is desired. The exact pathogenesis of CNS GCTs remains unclear, with conventional thought being that GCTs arise from the aberrant migration of progenitor germ cells. KIT mutations are the most commonly found abnormality in whole genome sequencing, particularly in germinomas. This is followed by genes involved in the MAPK signaling and AKT/mTOR pathways. There is currently no universal standard of care for the treatment of CNS GCT. Germinomas respond exceptionally well to chemotherapy and radiation therapy with survival rates well in excess of 90% with irradiation alone. Current clinical trials are testing the role of adjuvant chemotherapy followed by reduced dose and volume of irradiation. Conversely, NGGCTs are more resistant to therapy with poor survival rates, requiring more intensive chemotherapy as well as higher doses of irradiation.
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Abbreviations
- AFP:
-
Alpha-fetoprotein
- AuHCR:
-
Autologous hematopoietic cell rescue
- CBTRUS:
-
Central Brain Tumor Registry of the United States
- CCKBR:
-
Cholecystokinin B receptor
- CGH:
-
Comparative genomic hybridization
- CNS:
-
Central nervous system
- COG:
-
Children’s Oncology Group
- CR:
-
Complete response
- CSF:
-
Cerebrospinal fluid
- CSI:
-
Craniospinal irradiation
- CT:
-
Computed tomography
- ETV:
-
Endoscopic third ventriculostomy
- FISH:
-
Fluorescent in situ hybridization
- GCT:
-
Germ cell tumor
- Gy:
-
Gray
- IFR:
-
Involved field radiation
- miRNA:
-
microRNA
- MMGCT:
-
Mixed malignant germ cell tumor
- MRI:
-
Magnetic resonance imaging
- NGGCT:
-
Nongerminomatous germ cell tumor
- OS:
-
Overall survival
- PFS:
-
Progression-free survival
- PLAP:
-
Placental alkaline phosphatase
- PR:
-
Partial response
- qRT-PCR:
-
Quantitative reverse transcriptase polymerase chain reaction
- RT:
-
Radiation therapy
- SFOP:
-
Société Française d’Oncologie Pédiatrique
- SIOP:
-
Société Internationale d’Oncologie Pédiatrique
- SNRPN:
-
Small nuclear ribonucleoprotein polypeptide N
- VP:
-
Ventricular peritoneal
- WBI:
-
Whole brain irradiation
- WES:
-
Whole exome sequencing
- WHO:
-
World Health Organization
- WVI:
-
Whole ventricular irradiation
- YST:
-
Yolk sac tumors
- βhCG:
-
β Human chorionic gonadotropin
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Yeo, K.K., Dhall, G. (2018). Germ Cell Tumors. In: Gajjar, A., Reaman, G., Racadio, J., Smith, F. (eds) Brain Tumors in Children. Springer, Cham. https://doi.org/10.1007/978-3-319-43205-2_11
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