Abstract
Human germ cell tumours (GCTs) are derived from stem cells of the early embryo and the germ line. They occur in the gonads (ovaries and testes) and also in extragonadal sites, where migrating primordial germ cells are located during embryogenesis. This group of heterogeneous neoplasms is unique in that their developmental potential is in effect determined by the latent potency state of their cells of origin, which are reprogrammed to omnipotent, totipotent or pluripotent stem cells. Seven GCT types, defined according to their developmental potential, have been identified, each with distinct epidemiological and (epi)genomic features. Heritable predisposition factors affecting the cells of origin and their niches likely explain bilateral, multiple and familial occurrences of the different types of GCTs. Unlike most other tumour types, GCTs are rarely caused by somatic driver mutations, but arise through failure to control the latent developmental potential of their cells of origin, resulting in their reprogramming. Consistent with their non-mutational origin, even the malignant tumours of the group are characterized by wild-type TP53 and high sensitivity for DNA damage. However, tumour progression and the rare occurrence of treatment resistance are driven by embryonic epigenetic state, specific (sub)chromosomal imbalances and somatic mutations. Thus, recent progress in understanding GCT biology supports a comprehensive developmental pathogenetic model for the origin of all GCTs, and provides new biomarkers, as well as potential targets for treatment of resistant disease.
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Acknowledgements
The authors gratefully acknowledge the patients and colleagues who over the past 40 years have contributed to their research, and the support received from the Dutch Cancer Society.
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Glossary
- Retroperitoneal
-
Located in the retroperitoneum (that is, the anatomical space behind the peritoneal cavity).
- Mediastinal
-
Located in the mediastinum, subdivided into anterior mediastinum (anatomical space between the heart and the thoracic wall) and posterior mediastinum (anatomical space between the heart and the spine).
- Seminomatous GCTs
-
Malignant GCTs composed of transformed primordial germ cells (extragonadal) or gonocytes (testis, ovary and dysgenetic gonad). Tumours of identical histological type are referred to as seminoma in the testis and mediastinum, dysgerminoma in the ovary and germinoma in the brain; collectively the are referred to as seminomatous GCTs.
- Non-seminomatous GCTs
-
Malignant GCTs consisting of embryonal carcinoma, embryoid bodies, teratoma, yolk sac tumour and choriocarcinoma, either as a pure tumour or as part of a mixed tumour with occasional germ line differentiation. Tumours of identical histological type are referred to as non-seminoma in the testis and mediastinum, non-dysgerminoma in the ovary and non-germinoma in the brain; collectively they are referred to as non-seminomatous GCTs.
- Pluripotent
-
The developmental potential of primed embryonal stem cells, capable of forming embryonic somatic tissues, and not readily contributing to extraembryonic tissues and the germ line.
- Blastomeres
-
Cells produced by a cleavage division of the zygote; the first blastomeres still possess the omnipotency of the zygote.
- Totipotent
-
The developmental potential of naive embryonal stem cells, capable of forming embryonic somatic tissues, and extraembryonic tissues (yolk sac and placenta) and the germ line.
- Epiblast
-
One of two distinct layers arising from the inner cell mass in the mammalian blastocyst.
- Partial hydatidiform mole
-
Triploid pregnancy in which a normal ovum is fertilized by two sperm. It results in overgrowth of the placenta, and a thwarted embryo, due to the ‘overdose’ of paternally imprinted genes.
- Complete hydatidiform mole
-
Also known as complete mole, a diploid benign germ cell tumour resulting from fertilization of an empty ovum by two sperm, and composed of trophoblastic tissue; no development of the embryo due to absence of maternal imprinting.
- Genomic imprinting
-
The mechanism whereby the expression of genes may differ depending on the parental origin.
- Teratoma
-
A germ cell tumour composed of mature somatic tissues; depending on the germ cell tumour type, teratomas can be benign (types I and IV), malignant (type II) or both (type VI).
- Gonocytes
-
Primordial germ cells within the genital ridge before sex-specific differentiation.
- Germ cell neoplasia in situ
-
(GCNIS). Formerly known as carcinoma in situ, intratubular germ cell neoplasia of the unclassified type, or testicular intraepithelial neoplasia, an in situ malignant germ cell tumour confined to seminiferous tubules, composed of transformed gonocytes and located in the spermatogonial niche.
- Gonadoblastoma
-
In situ malignant germ cell tumour of dysplastic gonads, composed of transformed gonocytes enveloped by supporting stromal cells, usually granulosa cells.
- Spermatogonia
-
Stem cells of spermatogenesis.
- Spermatocytic tumours
-
Previously referred to as spermatocytic seminomas, benign germ cell tumours composed of postpubertal spermatogenetic cells in which meiosis is blocked.
- Parasitic twins
-
Poorly developed, nearly always monozygotic twins at the attachment sites of conjoined twins, or included within the body, typically in the abdomen or retroperitoneum.
- Dermoid cysts
-
Also known as cystic mature teratomas, in particular when occurring in extragonadal sites; cystic benign tumours of the ovary composed of mature somatic tissues, predominantly from the cranial part of the body.
- Parthenogenetically activated
-
Reprogramming of an egg, without fertilization.
- Sacrococcygeal region
-
Anatomical region encompassing the sacral and coccygeal bones and immediate surroundings.
- Telomerase
-
A ribonucleoprotein that uses its own RNA as a template for adding nucleotides to the ends of chromosomes.
- Telomeres
-
Short repeated sequences of DNA present at the linear ends of chromosomes that are important for ensuring complete replication of chromosome ends and for protecting the ends from fusion and degradation.
- Gynogenotes
-
Zygotes with two haploid sets of maternally imprinted chromosomes.
- Bilaterality
-
Synchronous or asynchronous occurrence of disease (for example, a tumour) in both of paired organs (for example, testes).
- Androgenotes
-
Zygotes with two haploid sets of paternally imprinted chromosomes.
- Trophoblast
-
Cells forming the outer layer of a blastocyst, giving origin to placental tissue.
- Dysgenetic gonad
-
Gonad disturbed in its sex-specific differentiation.
- Embryonal carcinoma
-
(EC). Malignant germ cell tumour composed of transformed embryonic stem cells, so-called embryonal carcinoma cells, the totipotent stem cells of non-seminomas.
- Cryptorchidism
-
Failure of testicular descent into the scrotum.
- Hypovirilization
-
Incompletely developed male phenotype, including gonads.
- Hypospadias
-
Abnormal opening of the urethra along the ventral aspect of the penis.
- Disorders of sex differentiation
-
(DSD). Also referred to as disorders of sex development or differences of sex development, congenital conditions in which development of chromosomal, gonadal or anatomical sex is atypical.
- Undifferentiated gonad
-
Embryonic gonad before differentiation towards testis or ovary.
- Sex cords
-
Strands of stromal cells, the precursors of Sertoli and granulosa cells in the undifferentiated gonad, colonized by gonocytes.
- Turner syndrome
-
A condition in which a female is partly or completely missing an X chromosome, characterized by primary hypogonadism and abnormal physical signs, such as a short and webbed neck.
- Leydig cells
-
Stromal cells between the seminiferous tubules of the testis which on stimulation by luteinizing hormone produce testosterone.
- Pre-GCNIS
-
Lesion of the seminiferous tubule at risk of progressing towards GCNIS.
- Spermatogenetic cells
-
Testicular germ cells producing sperm.
- Dysgerminomas
-
The equivalent of seminomas of the testis that occur in the ovary.
- Yolk sac tumours
-
(YSTs). Also known as a primitive endodermal tumour; a malignant germ cell tumour composed of extraembryonic structures (allantois and yolk sac) and/or intraembryonic endodermal derivatives (primitive gut and liver).
- Isochromosome
-
Abnormal chromosome with two short arms or two long arms only, resulting from horizontal instead of vertical division of the centromere.
- Mitotic–meiotic switch
-
Start of meiosis in germ cells.
- Angioinvasion
-
Infiltration of blood vessels by neoplastic cells.
- Pioneer factor
-
Factor able to open compacted chromatin and regulate gene expression in differentiated tissues and during embryonic development.
- Choriocarcinoma
-
Malignant tumour composed of trophoblastic tissue that may originate in the placenta or from a germ cell tumour.
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Oosterhuis, J.W., Looijenga, L.H.J. Human germ cell tumours from a developmental perspective. Nat Rev Cancer 19, 522–537 (2019). https://doi.org/10.1038/s41568-019-0178-9
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DOI: https://doi.org/10.1038/s41568-019-0178-9
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