Linked Life Data

11280732

Source:http://linkedlifedata.com/resource/pubmed/id/11280732

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
2001-3-30
pubmed:abstractText
Hypoxia inducible factor 1a and 2a (HIF-1a and HIF-2a) are key proteins regulating cellular response to hypoxia. Because the efficacy of photodynamic therapy (PDT) is dependent on the presence of oxygen, the assessment of HIF-1a and HIF-2a expression may be of value in predicting clinical response to PDT. Using recently produced MoAbs, we examined the expression of HIF1a and HIF2a in a series of 37 early-stage esophageal cancers treated with PDT and with additional radiotherapy in case of incomplete response after PDT. Strong expression of the HIF1a and of HIF2a proteins in all optical fields examined was noted in 51% and in 13% of cases, respectively. High expression was associated with a low complete response (CR) rate and with the absence of bcl-2 protein expression. On the contrary, bcl-2 expression was associated with a high CR rate. Combined analysis of HIF1a and bcl-2 protein expression revealed that of 16 cases with high HIF1a expression and the absence of bcl-2 reactivity, only 1 (7%) responded completely to PDT (P = 0.007). Bivariate analysis showed that HIF1a expression was independently related to response to PDT (P = 0.04; t ratio = 2.8), whereas bcl-2 approached significance (P = 0.07; t-ratio = 1.8). The final response to radiotherapy was high (70%) and independent of the HIF and bcl-2 status, which may be a result of reoxygenation after cellular depletion mediated by PDT. The present study suggests that assessment of HIF and of bcl-2 expression are important predictors of in vivo sensitivity to PDT. Modulation of PDT response with bioreductive drugs and/or drugs targeting bcl-2 (i.e., taxanes) may prove of significant therapeutic importance in a subgroup of patients with high HIF expression.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0008-5472
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
61
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1830-2
pubmed:dateRevised
2007-4-11
pubmed:meshHeading
pubmed-meshheading:11280732-Basic Helix-Loop-Helix Transcription Factors, pubmed-meshheading:11280732-Cell Nucleus, pubmed-meshheading:11280732-Combined Modality Therapy, pubmed-meshheading:11280732-Cytoplasm, pubmed-meshheading:11280732-DNA-Binding Proteins, pubmed-meshheading:11280732-Disease-Free Survival, pubmed-meshheading:11280732-Drug Resistance, Neoplasm, pubmed-meshheading:11280732-Esophageal Neoplasms, pubmed-meshheading:11280732-Hematoporphyrin Photoradiation, pubmed-meshheading:11280732-Humans, pubmed-meshheading:11280732-Hypoxia-Inducible Factor 1, pubmed-meshheading:11280732-Hypoxia-Inducible Factor 1, alpha Subunit, pubmed-meshheading:11280732-Nuclear Proteins, pubmed-meshheading:11280732-Proto-Oncogene Proteins c-bcl-2, pubmed-meshheading:11280732-Trans-Activators, pubmed-meshheading:11280732-Transcription Factors
pubmed:year
2001
pubmed:articleTitle
Hypoxia inducible factor (HIF-1a and HIF-2a) expression in early esophageal cancer and response to photodynamic therapy and radiotherapy.
pubmed:affiliation
Department of Radiotherapy and Oncology, Medical School, University of Thessalia, Larissa, Greece. targ@her.forthnet.gr
pubmed:publicationType
Journal Article