Elsevier

Seminars in Oncology

Volume 33, Issue 3, June 2006, Pages 312-323
Seminars in Oncology

Neoplastic Meningitis From Systemic Malignancies: Diagnosis, Prognosis and Treatment

https://doi.org/10.1053/j.seminoncol.2006.04.016Get rights and content

Long-term survival is occasionally observed in patients with neoplastic meningitis (NM) accompanying breast cancer (13% one-year and 6% 2-year survival), melanoma, and lymphoma, but in general the survival of most patients is short and averages only 3 to 4 months. The incidence of NM appears to be increasing, in part due to earlier detection by magnetic resonance imaging (MRI), and in part due to development of more effective therapies for systemic cancer, which has resulted in a larger subset at risk for late-stage development of this complication. Survival of NM patients is negatively affected by concomitant progression of systemic disease despite multiple prior therapies. However, there are certain prognostic factors that have been identified as “favorable” in retrospective series, including age less than 60 years, long symptom duration, controlled systemic disease, Karnofsky performance status (KPS) ≥70, lack of encephalopathy or cranial nerve deficits, low initial cerebrospinal fluid (CSF) protein level, history of breast primary tumor, and lack of evidence of CSF compartmentalization or bulky meningeal disease as determined by CSF flow studies. Standard treatment has traditionally involved radiotherapy (RT) to sites of symptomatic or bulky disease, as detected by neuroimaging, and in selected patients, the administration of intrathecal, intraventricular, or systemic chemotherapy. However, treatment remains palliative and many patients and physicians choose supportive care only. Future hope is provided by studies that have improved our understanding of the disease pathogenesis, have identified prognostic variables associated with outcome, and have provided new therapeutic approaches, such as administration of high-dose systemic chemotherapy and investigations of novel therapeutic agents.

Section snippets

Incidence

In retrospective series, NM has been observed in approximately 4% to 8% of patients with solid tumors, 5% to 15% of patients with hematologic malignancies, and less than 2% of patients with primary brain tumors.1 The frequency is also dependent on the histology and grade of the tumor, and on the duration of disease. For example, up to 30% of patients with Burkitt’s lymphoma may develop this complication,9 and in at least one series, an increasing incidence of NM in patients with non-small cell

Pathogenesis

The traditional mechanisms proposed for the pathogenesis of NM have been primarily based on post mortem observations, and known mechanisms of metastatic spread. Thus, it is generally accepted that most meningeal metastases occur following hematogenous dissemination to the meninges, or by direct extension from para-meningeal or bony contiguous structures (eg, bone of the skull or vertebrae, regional lymph nodes, or soft tissues), or by retrograde growth along the adventitia of blood vessels and

Clinical Features

The clinical features of NM are well described elsewhere.1, 2, 4, 7, 11, 12, 14 Most commonly, patients present with mental status changes, headache, recurrent vomiting, seizures, lower extremity weakness, gait ataxia, and sensory findings. The classical meningeal sign of nuchal rigidity is present in less than 20% of patients.11, 13 Initially, symptoms may be experienced by the patient for weeks (sometimes months) prior to the eventual diagnosis, and on occasion can appear relatively benign at

Examination of CSF

The clinical diagnosis of NM is typically supported by appropriate findings on neuroimaging or by examination of the CSF for the presence of malignant cells. Still, in approximately 5% to 10% of patients, the clinical diagnosis cannot be confirmed by these ancillary procedures.25

The direct confirmation of tumor cells within CSF, consistent with the systemic primary tumor (if known), represents the definitive diagnostic method. The relative sensitivity of this test is dependent on several

Prognosis

Most patients with NM from solid tumors survive only 3 to 4 months following diagnosis.13 Patients with NM from breast cancer appear to have a slightly longer median survival, varying from 11% to 25% at 1 year.48, 49 Although several factors mentioned earlier appear to correlate with improved prognosis (Table 2), no factors have been clearly established as predictive of response to specific therapies.

Many intrathecal chemotherapeutic agents currently in use are cell cycle–specific, which

“Standard” Treatments

There are several unresolved and controversial issues with respect to treatment of patients with NM (Table 3). These issues must eventually be properly addressed via the conduct of carefully designed, prospective clinical trials. To date there are no “standard” treatments for NM that have been shown to definitively prolong overall survival of these patients. However, by default, some chemotherapeutic agents with palliative benefit have become community standards of care for treatment of

Summary and Conclusions

NM is a devastating, late stage complication of cancer. Treatment to date has not had a significant effect on survival, although palliative clinical benefit, clearing of CSF cells, and improvement in time to neurologic progression have been observed following RT and after intrathecal and/or systemic chemotherapy. At this time, therapy should probably only be recommended for patients with more favorable prognostic factors, who are highly motivated to receive additional treatment, or those

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