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Advances in Molecular Profiling and Developing Clinical Trials of CNS Germ Cell Tumors: Present and Future Directions

  • Neuro-oncology (KS Nevel, Section Editor)
  • Published:
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Abstract

Purpose of Review

The last decade has seen significant improvements in the management and understanding of the pathogenesis of CNS germ cell tumors (GCTs) by studies on genomic and epigenomic analyses, and published results of clinical trials. This review highlights the new findings to stay up-to-date on the knowledge and better inform the future directions.

Recent Findings

CNS GCTs are characterized by either MAPK or PI3K pathway mutations. Germinoma has a striking global hypo-methylation, analogous to its hypothesized cell-of-origin; primordial germ cell. Micro RNA cluster mir-371–373 and mir-302/367 are characteristic of GCTs, which have potential for liquid biopsy. Clinical trials have revealed whole-ventricular irradiation for germinoma and local radiotherapy for localized non-germinomatous GCTs seem to be sufficient for tumor control.

Summary

Advancements in basic, translational, and clinical studies are improving our understanding of this rare disease. Further studies are needed, especially in the field of radiomics, liquid biopsy, genomic structural variants, and treatment stratification, to better structure the future management scheme.

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References

Papers of particular interest, published recently, have been highlighted as: • Of importance •• Of major importance

  1. •• Takami H, Fukuoka K, Fukushima S, Nakamura T, Mukasa A, Saito N, Yanagisawa T, Nakamura H, Sugiyama K, Kanamori M. Integrated clinical, histopathological, and molecular data analysis of 190 central nervous system germ cell tumors from the iGCT Consortium. Neuro Oncol. 2019;21:1565–77. The study included 190 CNS GCTs, and revealed germinoma prognosis depended on tumor location, marker-positive germinoma had worse prognosis, female GCTs had fewer MAPK pathway mutation, and basal ganglia GCTs had a higher percentage of PI3K pathway mutations.

    Article  CAS  Google Scholar 

  2. Jennings MT, Gelman R, Hochberg F. Intracranial germ-cell tumors: natural history and pathogenesis. J Neurosurg. 1985;63:155–67. https://doi.org/10.3171/jns.1985.63.2.0155.

    Article  CAS  PubMed  Google Scholar 

  3. Takami H, Graffeo CS, Perry A, Giannini C, Daniels DJ. Epidemiology, natural history, and optimal management of neurohypophyseal germ cell tumors. J Neurosurg. 2020;1:1–9.

    Google Scholar 

  4. Takami H, Graffeo CS, Perry A, Giannini C, Daniels DJ. The third eye sees double: cohort study of clinical presentation, histology, surgical approaches, and ophthalmic outcomes in pineal region germ cell tumors. World Neurosurg. 2021;150:e482–90.

    Article  Google Scholar 

  5. Gittleman H, Cioffi G, Vecchione-Koval T, Ostrom QT, Kruchko C, Osorio DS, Finlay JL, Barnholtz-Sloan JS. Descriptive epidemiology of germ cell tumors of the central nervous system diagnosed in the United States from 2006 to 2015. J Neurooncol. 2019;143:251–60.

    Article  Google Scholar 

  6. McCarthy BJ, Shibui S, Kayama T, Miyaoka E, Narita Y, Murakami M, Matsuda A, Matsuda T, Sobue T, Palis BE. Primary CNS germ cell tumors in Japan and the United States: an analysis of 4 tumor registries. Neuro Oncol. 2012;14:1194–200.

    Article  Google Scholar 

  7. • Takami H, Perry A, Graffeo CS, Giannini C, Narita Y, Nakazato Y, Saito N, Nishikawa R, Matsutani M, Ichimura K. Comparison on epidemiology, tumor location, histology, and prognosis of intracranial germ cell tumors between Mayo Clinic and Japanese consortium cohorts. J Neurosurg. 2020;1:1–11. The study demonstrated that basal ganglia GCTs were more frequent in East Asia, while bifocal tumors were more frequent in Western countries, suggesting the difference in tumor location in addition to its general frequency.

    Google Scholar 

  8. Lo AC, Hodgson D, Dang J, Tyldesley S, Bouffet E, Bartels U, Cheng S, Hukin J, Bedard PL, Goddard K. Intracranial germ cell tumors in adolescents and young adults: a 40-year multi-institutional review of outcomes. Int J Radiat Oncol Biol Phys. 2020;106:269–78.

    Article  Google Scholar 

  9. Hong KT, Lee DH, Kim BK, An HY, Choi JY, Phi JH, Cheon J-E, Kang HJ, Kim S-K, Kim J-Y. Treatment outcome and long-term follow-up of central nervous system germ cell tumor using upfront chemotherapy with subsequent photon or proton radiation therapy: a single tertiary center experience of 127 patients. BMC Cancer. 2020;20:1–10.

    Article  Google Scholar 

  10. Acharya S, DeWees T, Shinohara ET, Perkins SM. Long-term outcomes and late effects for childhood and young adulthood intracranial germinomas. Neuro Oncol. 2015;17:741–6. https://doi.org/10.1093/neuonc/nou311.

    Article  PubMed  Google Scholar 

  11. Calaminus G, Frappaz D, Kortmann RD, Krefeld B, Saran F, Pietsch T, Vasiljevic A, Garre ML, Ricardi U, Mann JR. Outcome of patients with intracranial non-germinomatous germ cell tumors—lessons from the SIOP-CNS-GCT-96 trial. Neuro Oncol. 2017;19:1661–72.

    Article  CAS  Google Scholar 

  12. •• Fangusaro J, Wu S, MacDonald S, Murphy E, Shaw D, Bartels U, Khatua S, Souweidane M, Lu H-M, Morris D. Phase II trial of response-based radiation therapy for patients with localized CNS nongerminomatous germ cell tumors: a Children’s Oncology Group Study. J Clin Oncol. 2019;37:3283–90. This paper reported the outcome of stratum 1 of ACNS1123 by COG, targeting 107 NGGCT cases. The study showed favorable 3y-PFS and OS of 84 and 93%, respectively, with whole-ventricular and local radiotherapy and alternating chemotherapy.

    Article  CAS  Google Scholar 

  13. • Takami H, Perry A, Graffeo CS, Giannini C, Daniels DJ. Novel diagnostic methods and posttreatment clinical phenotypes among intracranial germ cell tumors. Neurosurgery. 2020;87:563–72. The study showed that the cell fraction in cerebrospinal fluid predicted the histopathological diagnosis; lymphocyte-rich fluid was a sign of multiple lesions and germinoma, and monocyte-rich fluid reflects non-germinoma.

    Article  Google Scholar 

  14. Cheng S, Kilday J-P, Laperriere N, Janzen L, Drake J, Bouffet E, Bartels U. Outcomes of children with central nervous system germinoma treated with multi-agent chemotherapy followed by reduced radiation. J Neurooncol. 2016;127:173–80.

    Article  CAS  Google Scholar 

  15. Murray MJ, Bartels U, Nishikawa R, Fangusaro J, Matsutani M, Nicholson JC. Consensus on the management of intracranial germ-cell tumours. Lancet Oncol. 2015;16:e470–7. https://doi.org/10.1016/S1470-2045(15)00244-2.

    Article  PubMed  Google Scholar 

  16. Ichimura K, Fukushima S, Totoki Y, Matsushita Y, Otsuka A, Tomiyama A, Niwa T, Takami H, Nakamura T, Suzuki T, Fukuoka K, Yanagisawa T, Mishima K, Nakazato Y, Hosoda F, Narita Y, Shibui S, Yoshida A, Mukasa A, Saito N, Kumabe T, Kanamori M, Tominaga T, Kobayashi K, Shimizu S, Nagane M, Iuchi T, Mizoguchi M, Yoshimoto K, Tamura K, Maehara T, Sugiyama K, Nakada M, Sakai K, Kanemura Y, Nonaka M, Asai A, Yokogami K, Takeshima H, Kawahara N, Takayama T, Yao M, Kato M, Nakamura H, Hama N, Sakai R, Ushijima T, Matsutani M, Shibata T, Nishikawa R. Recurrent neomorphic mutations of MTOR in central nervous system and testicular germ cell tumors may be targeted for therapy. Acta Neuropathol. 2016. https://doi.org/10.1007/s00401-016-1557-x.

    Article  PubMed  PubMed Central  Google Scholar 

  17. Fukushima S, Otsuka A, Suzuki T, Yanagisawa T, Mishima K, Mukasa A, Saito N, Kumabe T, Kanamori M, Tominaga T, Narita Y, Shibui S, Kato M, Shibata T, Matsutani M, Nishikawa R, Ichimura K. Mutually exclusive mutations of KIT and RAS are associated with KIT mRNA expression and chromosomal instability in primary intracranial pure germinomas. Acta Neuropathol. 2014;127:911–25. https://doi.org/10.1007/s00401-014-1247-5.

    Article  CAS  PubMed  Google Scholar 

  18. Wang L, Yamaguchi S, Burstein MD, Terashima K, Chang K, Ng HK, Nakamura H, He Z, Doddapaneni H, Lewis L, Wang M, Suzuki T, Nishikawa R, Natsume A, Terasaka S, Dauser R, Whitehead W, Adekunle A, Sun J, Qiao Y, Marth G, Muzny DM, Gibbs RA, Leal SM, Wheeler DA, Lau CC. Novel somatic and germline mutations in intracranial germ cell tumours. Nature. 2014;511:241–5. https://doi.org/10.1038/nature13296.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  19. Ichimura K, Fukushima S, Totoki Y, Matsushita Y, Otsuka A, Tomiyama A, Niwa T, Takami H, Nakamura T, Suzuki T. Recurrent neomorphic mutations of MTOR in central nervous system and testicular germ cell tumors may be targeted for therapy. Acta Neuropathol. 2016;131:889–901.

    Article  CAS  Google Scholar 

  20. Miyake Y, Adachi JI, Suzuki T, Mishima K, Sasaki A, Nishikawa R. Craniospinal Germinomas in Patient with Down Syndrome Successfully Treated with Standard-Dose Chemotherapy and Craniospinal Irradiation: Case Report and Literature Review. World Neurosurg. 2017. https://doi.org/10.1016/j.wneu.2017.09.024.

    Article  PubMed  Google Scholar 

  21. Queipo G, Aguirre D, Nieto K, Pena YR, Palma I, Olvera J, Chavez L, Najera N, Kofman-Alfaro S. Intracranial germ cell tumors: association with Klinefelter syndrome and sex chromosome aneuploidies. Cytogenet Genome Res. 2008;121:211–4. https://doi.org/10.1159/000138887.

    Article  CAS  PubMed  Google Scholar 

  22. Fukushima S, Yamashita S, Kobayashi H, Takami H, Fukuoka K, Nakamura T, Yamasaki K, Matsushita Y, Nakamura H, Totoki Y, Kato M, Suzuki T, Mishima K, Yanagisawa T, Mukasa A, Saito N, Kanamori M, Kumabe T, Tominaga T, Nagane M, Iuchi T, Yoshimoto K, Mizoguchi M, Tamura K, Sakai K, Sugiyama K, Nakada M, Yokogami K, Takeshima H, Kanemura Y, Matsuda M, Matsumura A, Kurozumi K, Ueki K, Nonaka M, Asai A, Kawahara N, Hirose Y, Takayama T, Nakazato Y, Narita Y, Shibata T, Matsutani M, Ushijima T, Nishikawa R, Ichimura K. Genome-wide methylation profiles in primary intracranial germ cell tumors indicate a primordial germ cell origin for germinomas. Acta Neuropathol. 2017;133:445–62. https://doi.org/10.1007/s00401-017-1673-2.

    Article  CAS  PubMed  Google Scholar 

  23. Schulte SL, Waha A, Steiger B, Denkhaus D, Dörner E, Calaminus G, Leuschner I, Pietsch T. CNS germinomas are characterized by global demethylation, chromosomal instability and mutational activation of the Kit-, Ras/Raf/Erk-and Akt-pathways. Oncotarget. 2016;7:55026.

    Article  Google Scholar 

  24. Hoei-Hansen CE, Carlsen E, Jorgensen N, Leffers H, Skakkebaek NE, Rajpert-De Meyts E. Towards a non-invasive method for early detection of testicular neoplasia in semen samples by identification of fetal germ cell-specific markers. Hum Reprod. 2007;22:167–73. https://doi.org/10.1093/humrep/del320.

    Article  CAS  PubMed  Google Scholar 

  25. Wang HW, Wu YH, Hsieh JY, Liang ML, Chao ME, Liu DJ, Hsu MT, Wong TT. Pediatric primary central nervous system germ cell tumors of different prognosis groups show characteristic miRNome traits and chromosome copy number variations. BMC Genomics. 2010;11:132. https://doi.org/10.1186/1471-2164-11-132.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  26. Litchfield K, Levy M, Orlando G, Loveday C, Law PJ, Migliorini G, Holroyd A, Broderick P, Karlsson R, Haugen TB, Kristiansen W, Nsengimana J, Fenwick K, Assiotis I, Kote-Jarai Z, Dunning AM, Muir K, Peto J, Eeles R, Easton DF, Dudakia D, Orr N, Pashayan N, Bishop DT, Reid A, Huddart RA, Shipley J, Grotmol T, Wiklund F, Houlston RS, Turnbull C. Identification of 19 new risk loci and potential regulatory mechanisms influencing susceptibility to testicular germ cell tumor. Nat Genet. 2017;49:1133–40. https://doi.org/10.1038/ng.3896.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  27. Hemminki K, Li X. Familial risk in testicular cancer as a clue to a heritable and environmental aetiology. Br J Cancer. 2004;90:1765–70.

    Article  CAS  Google Scholar 

  28. Takami H, Fukushima S, Fukuoka K, Suzuki T, Yanagisawa T, Matsushita Y, Nakamura T, Arita H, Mukasa A, Saito N, Kanamori M, Kumabe T, Tominaga T, Kobayashi K, Nagane M, Iuchi T, Tamura K, Maehara T, Sugiyama K, Nakada M, Kanemura Y, Nonaka M, Yokogami K, Takeshima H, Narita Y, Shibui S, Nakazato Y, Nishikawa R, Ichimura K, Matsutani M. Human chorionic gonadotropin is expressed virtually in all intracranial germ cell tumors. J Neurooncol. 2015;124:23–32. https://doi.org/10.1007/s11060-015-1809-y.

    Article  CAS  PubMed  Google Scholar 

  29. Fukuoka K, Yanagisawa T, Suzuki T, Shirahata M, Adachi JI, Mishima K, Fujimaki T, Katakami H, Matsutani M, Nishikawa R. Human chorionic gonadotropin detection in cerebrospinal fluid of patients with a germinoma and its prognostic significance: assessment by using a highly sensitive enzyme immunoassay. J Neurosurg Pediatr. 2016;18:573–7. https://doi.org/10.3171/2016.4.PEDS1658.

    Article  PubMed  Google Scholar 

  30. Michaiel G, Strother D, Gottardo N, Bartels U, Coltin H, Hukin J, Wilson B, Zelcer S, Hansford JR, Hassall T. Intracranial growing teratoma syndrome (iGTS): an international case series and review of the literature. J Neurooncol. 2020;147:721–30.

    Article  CAS  Google Scholar 

  31. •• Fonseca A, Xia C, Lorenzo AJ, Krailo M, Olson TA, Pashankar F, Malogolowkin MH, Amatruda JF, Billmire DF, Rodriguez-Galindo C. Detection of relapse by tumor markers versus imaging in children and adolescents with nongerminomatous malignant germ cell tumors: a report from the Children’s Oncology Group. J Clin Oncol. 2019;37:396. The study revealed tumor markers were a sensitive method in detecting a relapse in the surveillance after standard treatment for CNS GCTs.

    Article  CAS  Google Scholar 

  32. Cheung V, Segal D, Gardner SL, Zagzag D, Wisoff JH, Allen JC, Karajannis MA. Utility of MRI versus tumor markers for post-treatment surveillance of marker-positive CNS germ cell tumors. J Neurooncol. 2016;129:541–4.

    Article  CAS  Google Scholar 

  33. Aihara Y, Watanabe S, Amano K, Komatsu K, Chiba K, Imanaka K, Hori T, Ohba T, Dairoku H, Okada Y. Placental alkaline phosphatase levels in cerebrospinal fluid can have a decisive role in the differential diagnosis of intracranial germ cell tumors. J Neurosurg. 2018;131:687–94.

    Article  Google Scholar 

  34. Dieckmann K-P, Radtke A, Spiekermann M, Balks T, Matthies C, Becker P, Ruf C, Oing C, Oechsle K, Bokemeyer C. Serum levels of microRNA miR-371a-3p: a sensitive and specific new biomarker for germ cell tumours. Eur Urol. 2017;71:213–20.

    Article  CAS  Google Scholar 

  35. • Murray MJ, Ajithkumar T, Harris F, Williams RM, Jalloh I, Cross J, Ronghe M, Ward D, Scarpini CG, Nicholson JC. Clinical utility of circulating miR-371a-3p for the management of patients with intracranial malignant germ cell tumors. Neuro-Oncol Adv. 2020;2:vdaa048. The study revealed that miR-371a-3p can be a clinically useful and sensitive marker in diagnosing non-germinoma as detected in blood serum and cerebrospinal fluid.

    Article  Google Scholar 

  36. Hsieh T-H, Liu Y-R, Chang T-Y, Liang M-L, Chen H-H, Wang H-W, Yen Y, Wong T-T. Global DNA methylation analysis reveals miR-214-3p contributes to cisplatin resistance in pediatric intracranial nongerminomatous malignant germ cell tumors. Neuro Oncol. 2018;20:519–30.

    Article  CAS  Google Scholar 

  37. Zapka P, Dorner E, Dreschmann V, Sakamato N, Kristiansen G, Calaminus G, Vokuhl C, Leuschner I, Pietsch T. Type, frequency, and spatial distribution of immune cell infiltrates in CNS germinomas: evidence for inflammatory and immunosuppressive mechanisms. J Neuropathol Exp Neurol. 2017. https://doi.org/10.1093/jnen/nlx106.

    Article  Google Scholar 

  38. Goldman S, Bouffet E, Fisher PG, Allen JC, Robertson PL, Chuba PJ, Donahue B, Kretschmar CS, Zhou T, Buxton AB. Phase II trial assessing the ability of neoadjuvant chemotherapy with or without second-look surgery to eliminate measurable disease for nongerminomatous germ cell tumors: A Children’s Oncology Group Study. J Clin Oncol. 2015;33:2464.

    Article  CAS  Google Scholar 

  39. Bartels U, Fangusaro J, Shaw D, Bhatia A, Omar-Thomas A, Wu S, MacDonald S, Murphy E, Souweidane M, Fouladi M. GCT-41. Response-based radiation therapy in patients with newly diagnosed central nervous system localized germinoma: a children’s oncology group (cog) prospective phase 2 clinical trial. Neuro-Oncology. 2020;22:iii336.

    Article  Google Scholar 

  40. Calaminus G, Kortmann R, Worch J, Nicholson JC, Alapetite C, Garre ML, Patte C, Ricardi U, Saran F, Frappaz D. SIOP CNS GCT 96: final report of outcome of a prospective, multinational nonrandomized trial for children and adults with intracranial germinoma, comparing craniospinal irradiation alone with chemotherapy followed by focal primary site irradiation for patients with localized disease. Neuro Oncol. 2013;15:788–96. https://doi.org/10.1093/neuonc/not019.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  41. Matsutani M, Group JPBTS. Combined chemotherapy and radiation therapy for CNS germ cell tumors–the Japanese experience. J Neurooncol. 2001;54:311–6.

    Article  CAS  Google Scholar 

  42. • Kanamori M, Takami H, Yamaguchi S, Sasayama T, Yoshimoto K, Tominaga T, Inoue A, Ikeda N, Kambe A, Kumabe T. So-called bifocal tumors with diabetes insipidus and negative tumor markers: are they all germinoma? Neuro Oncol. 2021;23:295–303. The study showed that 3.4% of bifocal tumors with diabetes insipidus and negative tumor marker were histopathologically non-germinoma, suggesting the necessity of surgical biopsy.

    Article  Google Scholar 

  43. Aizer AA, Sethi RV, Hedley-Whyte ET, Ebb D, Tarbell NJ, Yock TI, Macdonald SM. Bifocal intracranial tumors of nongerminomatous germ cell etiology: diagnostic and therapeutic implications. Neuro Oncol. 2013;15:955–60. https://doi.org/10.1093/neuonc/not050.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  44. Phuakpet K, Larouche V, Hawkins C, Huang A, Tabori U, Bartels UK, Bouffet E. Rare Presentation of Supratentorial Primitive Neuroectodermal Tumors Mimicking Bifocal Germ Cell Tumors: 2 Case Reports. J Pediatr Hematol Oncol. 2016;38:e67-70. https://doi.org/10.1097/MPH.0000000000000402.

    Article  PubMed  Google Scholar 

  45. Kanamori M, Takami H, Suzuki T, Tominaga T, Kurihara J, Tanaka S, Hatazaki S, Nagane M, Matsuda M, Yoshino A. Necessity for craniospinal irradiation of germinoma with positive cytology without spinal lesion on MR imaging—a controversy. Neuro-Oncol Adv. 2021;3:vdab086.

    Article  Google Scholar 

  46. Murray MJ, Bailey S, Heinemann K, Mann J, Göbel UK, Saran F, Hale JP, Calaminus G, Nicholson JC. Treatment and outcomes of UK and German patients with relapsed intracranial germ cell tumors following uniform first-line therapy. Int J Cancer. 2017;141:621–35.

    Article  CAS  Google Scholar 

  47. •• Takami H, Fukushima S, Aoki K, Satomi K, Narumi K, Hama N, Matsushita Y, Fukuoka K, Yamasaki K, Nakamura T. Intratumoural immune cell landscape in germinoma reveals multipotent lineages and exhibits prognostic significance. Neuropathol Appl Neurobiol. 2020;46:111–24. The study showed that germinoma with low tumor cell content showed favorable prognosis than those with high tumor cell content, and PD-1 and PD-L1 were highly expressed in lymphocytes and germinoma cells, respectively.

    Article  CAS  Google Scholar 

  48. Takami H, Satomi K, Fukuoka K, Fukushima S, Matsushita Y, Yamasaki K, Nakamura T, Tanaka S, Mukasa A, Saito N. Low tumor cell content predicts favorable prognosis in germinoma patients. Neuro-Oncol Adv. 2021;3(1).

  49. Wildeman ME, Shepard MJ, Oldfield EH, Lopes MBS. Central nervous system germinomas express programmed death ligand 1. J Neuropathol Exp Neurol. 2018;77:312–6.

    Article  Google Scholar 

  50. Zschäbitz S, Lasitschka F, Jäger D, Grüllich C. Activity of immune checkpoint inhibition in platinum refractory germ-cell tumors. Ann Oncol. 2016;27:1356–60.

    Article  Google Scholar 

  51. Lindsay H, Huang Y, Du Y, Braun FK, Teo WY, Kogiso M, Qi L, Zhang H, Zhao S, Mao H. Preservation of KIT genotype in a novel pair of patient-derived orthotopic xenograft mouse models of metastatic pediatric CNS germinoma. J Neurooncol. 2016;128:47–56.

    Article  CAS  Google Scholar 

  52. Parekh V, Jacobs MA. Radiomics: a new application from established techniques. Expert Rev Precis Med Drug Dev. 2016;1:207–26.

    Article  Google Scholar 

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Funding

This study was supported by Grant-in-Aid for Young Scientists, KAKENHI No. 20K17918 from the Japan Society for the Promotion of Science (JSPS).

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Correspondence to Hirokazu Takami.

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Takami, H. Advances in Molecular Profiling and Developing Clinical Trials of CNS Germ Cell Tumors: Present and Future Directions. Curr Oncol Rep 24, 105–112 (2022). https://doi.org/10.1007/s11912-022-01195-2

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