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another pertinent ABSTRACT:

2052 General Poster Session (Board #13G), Sat, 1:15 PM-5:15 PM
Concurrent intrathecal methotrexate and liposomal cytarabine for the treatment of leptomeningeal metastasis from solid tumors.
Brian J. Scott, Homira Feely, Tiffany Brown, Vincent Van Vugt, Ryan Kim, Paul Timothy Fanta, Lyudmila Bazhenova, Santosh Kesari; University of California, San Francisco, San Francisco, CA; University of California, San Diego, La Jolla, CA; University of California, San Diego Moores Cancer Center, La Jolla, CA
Background: Leptomeningeal metastasis (LM) from solid tumors is typically a late manifestation of disease with a median survival of weeks to a few months. Treatment is palliative, with no widely accepted standard of care. Options include intrathecal (IT) or systemic chemotherapy, radiation therapy or ventriculoperitoneal shunting. Randomized trials comparing single agent IT methotrexate to liposomal cytarabine have shown similar efficacy and tolerability. There is limited data, however, on the use of combination IT chemotherapy in solid tumor LM. Methods: We conducted a retrospective cohort study of 19 subjects treated for LM from solid tumors at a single institution. In addition to therapies directed at active solid tumor sites, each subject received IT liposomal cytarabine plus IT methotrexate injections every two weeks. Survival data and treatment-related toxicities were determined by systematic chart review. Results: LM was diagnosed by CSF cytology in 12/19 (63%), while the remainder were diagnosed by clinical and MRI findings. The most common cancer types were breast 7(37%), glioblastoma 6(32%) and lung 3(16%). The majority 18(95%) had active systemic or parenchymal brain disease at the time of treatment, requiring systemic chemotherapy 18(95%) or radiation therapy 13(68%). The median number of IT treatments was 4(range 1-9). Treatment was interrupted due to toxicity in 3(17%), while 7(37%) experienced 􏰆 CTCAE grade III toxicities, most commonly meningitis 3(16%). Treatment was stopped in 7/19(37%) following complete cytologic response 6/11(55%) or radiographic clearance 1/7(14%). The median overall survival was 96 days(n􏰃6; range 29-158), median time to neurologic progression was 46 days (n􏰃9; range 6-101) and the most common cause of death was progression of systemic disease 4(67%). Conclusions: Combination IT chemotherapy was reasonably well-tolerated, even in a population also receiving chemotherapy for progressive systemic disease. IT-related adverse events occurred at rates similar to previously reported single agent trials. Prospective evaluation is necessary to determine whether there is a survival benefit compared to single agent IT chemotherapy.