Linked Life Data

19380403

Source:http://linkedlifedata.com/resource/pubmed/id/19380403

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:dateCreated
2009-4-30
pubmed:abstractText
Most anticancer drugs are effective only in subgroups of patients, and our current understanding of tumor biology does not allow us to predict accurately which patient will benefit from a specific therapeutic regimen. Various techniques have, therefore, been developed for monitoring tumor response to therapy, but measuring tumor shrinkage on CT represents the current standard. Although response assessment on CT has been refined over many years, fundamental limitations remain. Interobserver variability in tumor size measurements is still high because of difficulties in delineating tumor tissue from secondary changes in the surrounding tissues. Furthermore, CT is inaccurate in differentiating viable tumor from necrotic or fibrotic tissue. Consequently, the degree of response may be underestimated on CT. Conversely, if tumor shrinkage is short lived and followed by rapid tumor regrowth, CT may overestimate the beneficial effects of a treatment. Finally, CT is limited in characterizing responses in tumors that do not change in size during therapy. Because the growth rate of untreated human tumors varies tremendously, an unchanged tumor size after some weeks of therapy may represent a drug effect but may also indicate a slowly growing tumor that was not affected by the applied therapy. Molecular imaging with PET and the glucose analogue (18)F-FDG PET has been shown to improve response assessment in several tumor types. In malignant lymphoma, international criteria for monitoring response to therapy have recently been revised, and the (18)F-FDG signal now plays a central role in defining tumor response. In a variety of solid tumors, single-center studies have indicated that (18)F-FDG PET may provide earlier or more accurate assessment of tumor response than CT, suggesting that (18)F-FDG PET could play a significant role in personalizing the treatment of malignant tumors. However, generally accepted criteria for response assessment in solid tumors are missing, which makes it frequently impossible to compare the results of different studies. International guidelines and criteria for response assessment by (18)F-FDG PET in solid tumors are, therefore, eagerly awaited.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0161-5505
pubmed:author
pubmed:issnType
Print
pubmed:volume
50 Suppl 1
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1S-10S
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
Assessing tumor response to therapy.
pubmed:affiliation
Department of Nuclear Medicine, University of Freiburg, Freiburg, Germany. Wolfgang.weber@uniklinik-freiburg.de
pubmed:publicationType
Journal Article, Review