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Quantification of local tumor response to fractionated radiation therapy for non-Hodgkin lymphoma using weekly 18F-FDG PET/CT imaging.

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Title: Quantification of local tumor response to fractionated radiation therapy for non-Hodgkin lymphoma using weekly 18F-FDG PET/CT imaging.
Authors: Keller H (AUTHOR), Goda JS (AUTHOR), Vines DC (AUTHOR), Lockwood G (AUTHOR), Tsang R (AUTHOR), Keller, Harald1 (AUTHOR), Goda, Jayant Sastri (AUTHOR), Vines, Douglass C (AUTHOR), Lockwood, Gina (AUTHOR), Tsang, Richard (AUTHOR)
Source: International Journal of Radiation Oncology, Biology, Physics. Mar2010, Vol. 76 Issue 3, p850-858. 9p.
Abstract: Purpose: To quantify, in a feasibility study, metabolic and volumetric response to fractionated radiation therapy (RT) using weekly (18)F fluoro-deoxyglucose positron emission tomography (PET) imaging for 10 non-Hodgkin lymphoma (NHL) patients, and to correlate them to clinical outcome. Methods and Materials: Ten patients with chemotherapy-refractory NHL planned for radical RT were prospectively entered into a research study. PET/computed tomography (CT) scans were acquired before RT, and repeated weekly during the 3- to 4-week course of RT, and at 1 and 3 months after therapy. Gross tumor volumes were contoured on CT scans and the corresponding maximum standardized uptake values (SUV(max)) determined in the coregistered PET images. The clinical outcomes of interest were local tumor response at 3 months post-RT and local tumor status at last follow-up or time of death. Results: (18)F fluoro-deoxyglucose uptake from inflammation was rarely observed. The responses showed a large variability between patients. SUV(max) decreased consistently with a median of -2.1% per Gy (range, -3.3 to -0.7) and the median of the volumetric response was -2.2% per Gy (range, -2.8 to +0.5). Initial SUV(max) was not correlated with local control, whereas smaller initial tumor volume was, with smaller tumors more likely to achieve local control. The responses after treatment were also correlated to local control, but not the responses during treatment. Conclusions: Radiation does not confound the FDG uptake in the NHL tumor and normal tissues. Only smaller initial tumor volume and metabolic and volumetric response after completion of radiation therapy significantly correlated with eventual local control. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Radiation Oncology, Biology, Physics is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: Quantification of local tumor response to fractionated radiation therapy for non-Hodgkin lymphoma using weekly 18F-FDG PET/CT imaging.
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  Data: <searchLink fieldCode="AR" term="%22Keller+H%22">Keller H</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Goda+JS%22">Goda JS</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Vines+DC%22">Vines DC</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lockwood+G%22">Lockwood G</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tsang+R%22">Tsang R</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Keller%2C+Harald%22">Keller, Harald</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Goda%2C+Jayant+Sastri%22">Goda, Jayant Sastri</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Vines%2C+Douglass+C%22">Vines, Douglass C</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lockwood%2C+Gina%22">Lockwood, Gina</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tsang%2C+Richard%22">Tsang, Richard</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Radiation+Oncology%2C+Biology%2C+Physics%22">International Journal of Radiation Oncology, Biology, Physics</searchLink>. Mar2010, Vol. 76 Issue 3, p850-858. 9p.
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: <bold>Purpose: </bold>To quantify, in a feasibility study, metabolic and volumetric response to fractionated radiation therapy (RT) using weekly (18)F fluoro-deoxyglucose positron emission tomography (PET) imaging for 10 non-Hodgkin lymphoma (NHL) patients, and to correlate them to clinical outcome. <bold>Methods and Materials: </bold>Ten patients with chemotherapy-refractory NHL planned for radical RT were prospectively entered into a research study. PET/computed tomography (CT) scans were acquired before RT, and repeated weekly during the 3- to 4-week course of RT, and at 1 and 3 months after therapy. Gross tumor volumes were contoured on CT scans and the corresponding maximum standardized uptake values (SUV(max)) determined in the coregistered PET images. The clinical outcomes of interest were local tumor response at 3 months post-RT and local tumor status at last follow-up or time of death. <bold>Results: </bold>(18)F fluoro-deoxyglucose uptake from inflammation was rarely observed. The responses showed a large variability between patients. SUV(max) decreased consistently with a median of -2.1% per Gy (range, -3.3 to -0.7) and the median of the volumetric response was -2.2% per Gy (range, -2.8 to +0.5). Initial SUV(max) was not correlated with local control, whereas smaller initial tumor volume was, with smaller tumors more likely to achieve local control. The responses after treatment were also correlated to local control, but not the responses during treatment. <bold>Conclusions: </bold>Radiation does not confound the FDG uptake in the NHL tumor and normal tissues. Only smaller initial tumor volume and metabolic and volumetric response after completion of radiation therapy significantly correlated with eventual local control. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Radiation Oncology, Biology, Physics is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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