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Positron emission tomography in non-Hodgkin's lymphoma: assessment of chemotherapy with fluorodeoxyglucose.

Abstract：

:Positron emission tomography (PET) using F-18 fluorodeoxyglucose (FDG) was performed in non-Hodgkin's lymphoma (NHL), which is known to be highly responsive to chemotherapy, but also yields variable treatment results to answer the following questions: (1) What is the extent and time course of changes in FDG utilization in response to chemotherapy? (2) Are the changes of FDG uptake at early time points of chemotherapy predictive for therapy outcome? (3) Which quantitative FDG parameter provides the most sensitive measures of initial tumor response? Dynamic PET scans were performed in 11 patients at baseline and 1 and 6 weeks after initiation of chemotherapy. Based on attenuation corrected images acquired 30 to 60 minutes postinjection, standardized uptake values (SUV) were determined. Arterial input functions were estimated from vascular F-18 activity and the metabolic rates for FDG (MRFDG) were calculated using Patlak analysis. Before chemotherapy, high FDG uptake was found in all lesions (SUV[max] 13.3 +/- 4.2). Seven days after initiation of chemotherapy, tumor FDG uptake decreased 60% (SUV[max]). A further decrease of 42% was seen at day 42 resulting in a total decrease of 79% from baseline to day 42. During a follow-up of 16.0 +/- 4.2 months, six of the 11 patients continued to show complete remission. Seven days after initiation of chemotherapy, this group of patients displayed significantly lower mean MRFDG than the group of patients with relapse. At day 42, all parameters of FDG uptake showed a significant difference for both patient groups. The relative change of MRFDG from baseline to day 42, as well as from day 7 to day 42, was significantly larger as compared with SUV parameters. Standard chemotherapy of patients with NHL causes rapid decrease of tumor FDG uptake as early as 7 days after treatment, which continues to decline during therapy, indicating the sensitivity of metabolic signals to chemotherapeutic interventions. FDG uptake at 42 days after therapy was superior in prediction of long-term outcome over day 7 parameters. Dynamic data acquisition combined with Patlak analysis of FDG kinetics may provide superior information in therapy monitoring.

journal_name

Blood

journal_title

Blood

authors

Römer W,Hanauske AR,Ziegler S,Thödtmann R,Weber W,Fuchs C,Enne W,Herz M,Nerl C,Garbrecht M,Schwaiger M

subject

Has Abstract

pub_date

1998-06-15 00:00:00

pages

4464-71

issue

12

eissn

0006-4971

issn

1528-0020

journal_volume

91

pub_type

杂志文章

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