Treatment pattern and outcomes of leptomeningeal carcinomatosis in India: CRSF201901 study

e14012 Background: Leptomeningeal carcinomatosis (LCM) is a rare event and has a dismal prognosis. Limited data is available from India on LCM. Hence we did this country wise audit of LCM. Methods: This was a retrospective, multicentric audit of adult (age ≥ 18 years) patients with diagnosis of LCM, conducted across India in 2020 for patients treated from 2010 to 2020. Baseline characteristics, previous treatments, cancer sites, LCM diagnosis details, treatment pattern and overall survival (OS) were collected. Descriptive statistics were performed and Kaplan Meier analysis was performed for estimation of OS. Results: We had 84 patients diagnosed with LCM. The diagnosis of LCM was confirmed in 52 (61.9%) and probable 32 (38.1%) patients. The mean age was 51.8 years (SD-10.8) and we had 46 (54.8%) females. The three most common site of malignancy were lung, breast and gastrointestinal with 45 (53.6%), 22 (26.1%) and 9 (10.7%) patients. The ECOG PS at the presentation of LCM was 1, 2 in and 3-4 in 41 (48.8%), 28 (33.3%) and 15 (17.9%) respectively. LCM was seen at diagnosis in 2 patients (2.4%) and at progression in rest. The status of the extracranial disease at the occurrence of LCM was progressive disease in 39 patients (46.1%). The treatment offered was best supportive care in 24 patients (28.6%), systemic therapy only in 27(32.1%), systemic therapy and intrathecal therapy in 22 (26.2%) and only intrathecal therapy in 11(13.1%). Among 33(39.3%) patients receiving IT methotrexate was used in 23 (27.4%) and the combination of methotrexate, AraC and hydrocortisone was used in 10 (11.9%). The CSF clearance rate was assessed in 24 (28.6%) patients and the clearance rate was 13.1% (n=11). The median duration of therapy was 4 weeks (IQR 1-14). The median os was 90 days (95% CI 46.2-133.8). Conclusions: LCM has a grave prognosis and nearly 1/3rd patients are treated with best supportive care. Intrathecal therapy though part of all guidelines is administered in 39% of patients. This data can serve as a benchmark for further improvement to facilitate studies for further improving the outcomes.