Which medications in the drug class Chemotherapeutic agents are used in the treatment of Leptomeningeal Metastases?

Answer

Chemotherapeutic agents

These agents inhibit cell growth and proliferation.

Methotrexate (Folex PFS, Rheumatrex)

Mainstay of treatment. Because meningeal infiltration interferes with drug clearance, CSF concentrations can be unpredictable. Monitor and maintain concentration near 10^-6 M, and coadminister with folinic acid and hydrocortisone if necessary.

Cytarabine (Cytosar-U)

Second-line agent used if MTX not tolerated or ineffective. Not effective for solid tumors but useful in leukemic and lymphomatous meningitis. Half-life longer in CSF than serum. Sustained-release form available in United States; extends half-life to >140 h.

Thiotepa

Third-line agent that acts as an alkylating agent. Intrathecal administration is an off-label use in the United States. It is cleared from CSF within minutes and has survival curves similar to those of methotrexate (MTX) with less neurologic toxicity (most common being transient limb paresthesias). Unlike MTX, no antidote for resulting myelosuppression is available. Causes cross-linking of DNA strands, inhibition of RNA, DNA, and protein synthesis, and thus cell proliferation.

Trastuzumab (Herceptin)

Off-label intrathecal (IT) administration of trastuzumab has been described in several case reports. Trastuzumab is a monoclonal antibody that inhibits growth of tumor of tumor cells that overexpress HER2. It is an effective systemic treatment of breast cancer, and as such, the potential use of IT administration for LC secondary to breast cancer has shown improved prognosis and decreased progression in several case reports.

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Herbert H Engelhard, III, MD, PhD, FACS, FAANS Affiliated Professor of Bioengineering, University of Illinois at Chicago

Herbert H Engelhard, III, MD, PhD, FACS, FAANS is a member of the following medical societies: American Association for Cancer Research, American Association of Neurological Surgeons, American College of Surgeons, American Medical Association, Congress of Neurological Surgeons, Illinois State Medical Society

Disclosure: Nothing to disclose.

Specialty Editor Board

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Received salary from Medscape for employment. for: Medscape.

Jorge C Kattah, MD Head, Associate Program Director, Professor, Department of Neurology, University of Illinois College of Medicine at Peoria

Jorge C Kattah, MD is a member of the following medical societies: American Academy of Neurology, American Neurological Association, New York Academy of Sciences

Disclosure: Nothing to disclose.

Chief Editor

Stephen A Berman, MD, PhD, MBA Professor of Neurology, University of Central Florida College of Medicine

Stephen A Berman, MD, PhD, MBA is a member of the following medical societies: Alpha Omega Alpha, American Academy of Neurology, Phi Beta Kappa

Disclosure: Nothing to disclose.

Additional Contributors

Michael J Schneck, MD, MBA Vice Chair and Professor, Departments of Neurology and Neurosurgery, Loyola University, Chicago Stritch School of Medicine; Associate Director, Stroke Program, Director, Neurology Intensive Care Program, Medical Director, Neurosciences ICU, Loyola University Medical Center

Michael J Schneck, MD, MBA is a member of the following medical societies: American Academy of Neurology, American Society of Neuroimaging, Neurocritical Care Society, Stroke Council of the American Heart Association

Disclosure: Nothing to disclose.

Frederick M Vincent, Sr, MD Clinical Professor, Department of Neurology and Ophthalmology, Michigan State University Colleges of Human and Osteopathic Medicine

Frederick M Vincent, Sr, MD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Neurology, American Association of Neuromuscular and Electrodiagnostic Medicine, American College of Forensic Examiners Institute, American College of Legal Medicine, American College of Physicians

Disclosure: Nothing to disclose.

Acknowledgements

Lawrence D Recht, MD Professor of Neurology and Neurosurgery, Department of Neurology and Clinical Neurosciences, Stanford University Medical School

Lawrence D Recht, MD is a member of the following medical societies: American Academy of Neurology, American Association for Cancer Research, American Neurological Association, and Society for Neuroscience

Disclosure: Nothing to disclose.

R Andrew Sewell, MD Associate Research Scientist in Psychiatry and Mental Illness Research, Education,Veterans Affairs Connecticut Health Care System, Yale University School of Medicine

R Andrew Sewell, MD is a member of the following medical societies: American Academy of Neurology, American Headache Society, American Pain Society, and American Psychiatric Association

Disclosure: Nothing to disclose.

Which medications in the drug class Chemotherapeutic agents are used in the treatment of Leptomeningeal Metastases?

Chemotherapeutic agents

Methotrexate (Folex PFS, Rheumatrex)

Cytarabine (Cytosar-U)

Thiotepa

Trastuzumab (Herceptin)

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