Central Nervous System Germinoma Treatment & Management
- Author: Amani Al-Kofide, MBBS; Chief Editor: Jules E Harris, MD more...
Medical Care
Radiation Therapy
In the past, patients with imaging findings typical of CNS germinoma were treated empirically with radiation therapy.[2] This approach has largely been abandoned, since current stereotactic biopsy techniques permit histological diagnosis with minimal risk of morbidity. Identification of the histological elements of the tumor is important in determining the most appropriate therapeutic strategy, because the different histological types vary in their sensitivity to radiation.[9, 37, 38] Germinomas are highly responsive to radiation therapy;[39, 21, 40] a complete response rate with a 5-year survival of more than 90% is seen with radiation therapy alone.[2, 41] NGGCTs are less radiosensitive than pure germinomas, with an overall 5-year survival of 30-50%.
Full-dose craniospinal radiation (CSI) was traditionally employed for patients with pure germinomas. Side effects of CSI may be significant, however. Studies comparing CSI with reduced-volume radiation, whether whole-brain or whole-ventricular, have shown no significant difference in the pattern of relapse in germinomas.[42, 9, 20, 43, 44]
Therefore, CSI is no longer used for localized germinomas.[42, 45]
Trials to determine the best regimen for radiation therapy are ongoing.[46, 41] Currently, patients with localized or multifocal disease may receive 24 Gy to the whole-ventricular system and a 21-Gy boost to all measurable disease. Most experts advocate a boost to the primary tumor bed in order to prevent local recurrence; 45 Gy appears to be a satisfactory upper dose limit.[47, 34, 48, 49] Patients with disseminated disease may receive 24 Gy to the craniospinal axis.[46, 39, 50]
Studies of radiation therapy alone versus neoadjuvant chemotherapy followed by response-based radiotherapy are currently under way.[42, 19, 39, 8, 44]
Reports in which chemotherapy was administered followed by reduced dose radiation therapy appears to be effective in patients with pure CNS germinomas with no deterioration in neurocognitive function and no compromise in outcome.[51]
The use of intensive chemotherapy alone without radiation therapy has proven less effective with inferior outcome compared to chemotherapeutic regimens and radiation therapy together.[52] Therefore radiation therapy remains an important and integral part of therapy for patients with CNS GCTs.
Chemotherapy
In patients with germinomas, chemotherapy has been recently added to the treatment regimen in order to permit the use of a lower radiation dose, thereby reducing the long-term morbidity associated with radiation therapy while maintaining the excellent survival rates.[41, 5, 9, 38, 8, 34] In patients with NGGCTs, the use of adjuvant chemotherapy with radiation therapy is intended to improve outcome, because even with surgery and CSI these patients have a poor prognosis.[41, 9, 19, 27, 53] The increase in survival seen with combination therapy has made chemotherapy an integral part of treatment for NGGCTs.[20, 43, 54, 47]
As with gonadal germ cell tumors, the agents that to date have shown the best activity against CNS GCTs are cisplatin, etoposide, vinblastine, bleomycin, and carboplatin.[34]
Ifosfamide and cyclophosphamide are also used.[38]
Patients with relapsed or progressive disease, especially those with NGGCTs, have a poor prognosis. High-dose chemotherapy followed by autologous stem cell transplant may be effective in this group of patients.[55]
Surgical Care
Currently the recommended practice is to acquire a tissue biopsy sample, with the exception of patients who have a characteristic elevation in tumor markers and in whom surgical intervention may lead to significant sequelae.[5, 21] {Ref27}[47, 34]
Surgical treatment of CNS GCTs varies according to the tumor type. Germinomas carry a relatively excellent prognosis and management has therefore focused on reducing morbidity. Partial and gross total resection of germinomas has no proven benefit and may lead to neurological or endocrinological deterioration. Therefore, most neurosurgeons limit surgical intervention to biopsy and instead treat these patients with radiation and chemotherapy.[42, 9, 8]
Patients with choriocarcinoma have an increased tendency to hemorrhage; current recommendation is for early and radical surgery.
Patients with NGGCTs have poor long-term survival, and surgery for these patients is aimed at improving outcome. Reduction of tumor burden by partial resection is often an option when removal of all tumor tissue is impossible. Adjuvant radiation therapy and chemotherapy are often incorporated in the treatment plan.[19, 56, 53]
Patients presenting with obstructive hydrocephalus may require a ventriculoperitoneal shunt.
In patients who have had an incomplete response to initial chemotherapy, second-look surgery may be performed to remove the residual tissue and permit its histological verification. The remaining tissue may contain malignant elements; however, it may consist of fibrosis, necrosis, or a mature teratoma — the so-called growing teratoma syndrome.[47, 34] . The growing teratoma syndrome is characterized by enlarging tumor mass during or after chemotherapy in the presence of normal or declining tumor markers. Surgical resection of the tumor is considered curative.[37, 57]
Consultations
Endocrinology
Patients with CNS GCTs may have a range of endocrine dysfunctions, including diabetes insipidus, hypothyroidism, precocious or delayed puberty, sexual dysfunction, growth failure, adrenal crises, and panhypopituitarism. Proper monitoring of hormone levels and electrolytes is essential. Lifelong hormonal replacement may be required for most of these patients.
Ophthalmology
Disturbance in vision is a common presenting feature. Evaluation by an ophthalmologist will identify the visual deficit.
Audiometry
Audiogram studies should be performed, especially in patients expected to receive radiation therapy and ototoxic agents — specifically, cisplatin.
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| Tumor type | β- HCG | AFP | PLAP | c-Kit |
| Germinoma-Pure | - | - | +/- | + |
| Germinoma with STGC | + | - | +/- | + |
| Endodermal sinus tumor | - | + | +/- | - |
| Choriocarcinoma | + | - | +/- | - |
| Embryonal Carcinoma | - | - | + | - |
| Mixed Teratoma | +/- | +/- | +/- | +/- |
| Mature Teratoma | - | - | - | - |
| Immature teratoma | +/- | +/- | - | +/- |

