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  • Title: Stand-alone intrathecal central nervous system (CNS) prophylaxis provide unclear benefit in reducing CNS relapse risk in elderly DLBCL patients treated with R-CHOP and is associated increased infection-related toxicity.
    Author: Eyre TA, Kirkwood AA, Wolf J, Hildyard C, Mercer C, Plaschkes H, Griffith J, Fields P, Gunawan A, Oliver R, Booth S, Martinez-Calle N, McMillan A, Bishton M, Fox CP, Collins GP, Hatton CSR.
    Journal: Br J Haematol; 2019 Oct; 187(2):185-194. PubMed ID: 31222719.
    Abstract:
    Central nervous system (CNS) relapse following R-CHOP (rituximab, cyclophosphamide, doxorubicin, vincristine, prednisolone) occurs in 2-5% of patents with diffuse large B-cell lymphoma (DLBCL). Many patients aged ≥70 years are unsuitable for high-dose methotrexate (HDMTX) prophylaxis and therefore often receive stand-alone intrathecal prophylaxis. The CNS international prognostic index (CNS-IPI) is a clinical CNS relapse risk score that has not specifically been validated in elderly patients. The value of CNS prophylaxis in patients aged ≥70 years remains uncertain. Data on 690 consecutively R-CHOP-treated DLBCL patients aged ≥70 years were collected across 8 UK centres (2009-2018). CNS prophylaxis was administered per physician preference. Median age was 77·2 years and median follow-up was 2·8 years. CNS-IPI was 1-3 in 60·1%, 4 in 23·8%, 5 in 13·0% and 6 in 3·3%. Renal and/or adrenal (R/A) involvement occurred in 8·8%. Two-year overall CNS relapse incidence was 2·6% and according to CNS-IPI, 1-3:0·8%, 4:3·6%, 5:3·8% and 6:21·8%. Two-year CNS relapse incidence for R/A was 10·0%. When excluding HDMTX (n = 31) patients, there remained no change in unadjusted/adjusted CNS relapse for intrathecal prophylaxis effect according to CNS-IPI. CNS-IPI is valid in elderly R-CHOP-treated DLBCL patients, with the highest risk in those with CNS-IPI 6 and R/A involvement. We observed no clear benefit for stand-alone intrathecal prophylaxis but observed an independent increased risk of infection-related admission during R-CHOP when intrathecal prophylaxis was administered.
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