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Demographics, Pattern of Care & Outcomes of Primary CNS Lymphoma- Experience from a Tertiary Care Cancer Center in India.

UNLABELLED: Primary CNS lymphoma (PCNSL) is a rare subtype of non-Hodgkin lymphoma with the worst outcomes amongst all extranodal lymphomas. There is a scarcity of data on real-world outcomes of primary CNS lymphoma (PCNSL) owing to the rarity of the disease. This study analyzed the demographic patterns, risk stratification, treatment regimens used, & outcomes of patients treated at Tata Memorial Center Mumbai, India. This is a retrospective analysis of newly diagnosed primary CNS lymphoma patients treated at our centre over seven years from January 2013 to December 2019. A total of 142 patients with PCNSL were diagnosed during this period. Thirty (21.1%) patients were deemed ineligible for any systemic or local therapies,ten patients were referred to other hospitals, two patients had relapsed disease, and one was excluded because age less than 18 years. Finally 99 patients were included in the final analysis. Among these 99 patients,72 patients (72.7%) were < 60 years,70 (70.7%) patients had Eastern cooperative oncology group (ECOG) performance status (PS) less than equal to 2. DLBCL was the most common histology (86.4%) while rests were high grade B cell NHL NOS (11.4%),Burkitt's Lymphoma(1%),Peripheral T-cell Lymphoma NOS (1.2%). Only one of 99 patients was positive for HIV serology. Multiple intracranial lesions were found in 59.5%. Surgical resection was performed in 28.4% of patients. Out of 63 patients in whom the International extranodal lymphoma study group (IELSG) score is available, 34(54%) were IELSG high-risk groups. As per Memorial Sloan Kettering Cancer Center (MSKCC) risk grouping, patients were almost equally distributed in all the risk groups, with 32(32.3%) patients in risk group 1 (age < 50 years), 36(36.4%) patients in risk group 2 (age > 50 years, KPS >  = 70), and 31(31.3%) patients in risk group 3 age > 50 years, KPS < 70). First-line treatment with high dose methotrexate (HD-MTX) based regimens was administered to 92 (92.9%) patients, and 72.8% of these patients received rituximab. Of these 92 patients, 59 (64.1%) patients could complete induction, and 52 patients received consolidation. Thirty-one patients received high dose cytarabine based chemo consolidation, one patient underwent high dose chemotherapy followed by autologous stem cell transplantation (ACST), and 19 patients received whole-brain radiotherapy (WBRT) and 1 patient received temozolomide as consolidation regimen. Thus only 52 patients completed the entire course of induction with consolidation therapy. The response to treatment was assessed using International PCNSL Collaborative Group Criteria. Post completion of consolidation, 49(94.2%) patients had a complete response. With a median follow-up duration of 39.2 months, the median progression-free survival (PFS) and the median overall survival (OS) of the patients taken into the analysis (N = 99) were 21 and 37 months respectively. On multivariate analysis, age < 60 yrs, >  = 5 HD-MTX cycles received & the use of rituximab predicted better OS.Outcomes of patients with PCNSL treated with HD-MTX based therapy are comparable to reported literature however a large proportion of patients do not undergo required treatment despite the curable nature of disease.

SUPPLEMENTARY INFORMATION: The online version supplementary material available at 10.1007/s12288-022-01557-7.

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