TY - JOUR
T1 - A correlation of FTIR spectra derived from prostate cancer biopsies with Gleason grade and tumour stage
AU - Gazi, Ehsan
AU - Baker, Matthew
AU - Dwyer, John
AU - Lockyer, Nicholas P.
AU - Gardner, Peter
AU - Shanks, Jonathan H.
AU - Reeve, Roy S.
AU - Hart, Claire A.
AU - Clarke, Noel W.
AU - Brown, Michael D.
PY - 2006/10/1
Y1 - 2006/10/1
N2 - We introduce biochemistry as a second dimension to Gleason grading, using Fourier transform infrared (FTIR) microspectroscopy. For the first time, we correlate FTIR spectra derived from prostate cancer (pCA) tissue with Gleason score and the clinical stage of the tumour at time of biopsy. Serial sections from paraffin-embedded pCA tissue were collected. One was stained with hematoxylin and eosin and Gleason scored; FTIR spectra were collected from malignant locations using a second unstained section. FTIR spectra, representing different Gleason grades, were used to construct a diagnostic classifier for pCA using linear discriminant analysis (LDA). This model was blind tested using 383 IR spectra from 36 biopsies. Using a three-band Gleason criteria, we obtained sensitivity of ≥70% for the FTIR-LDA model to predict Gleason <7, = 7, and >7, with specificities of ≥81%. Using a threshold of Gleason/FTIR-LDA score of ≥8, we obtained a sensitivity and specificity of 71% and 67%, respectively, for the correlation with metastatic tumours using the FTIR-LDA system and 85% and 63%, respectively, for the correlation of metastatic tumours using the Gleason system. There is a correlation between tissue architecture using Gleason score with tissue biochemistry using FTIR-LDA. Both systems are similar in their performance in predicting metastatic behaviour in tumours from individual patients.
AB - We introduce biochemistry as a second dimension to Gleason grading, using Fourier transform infrared (FTIR) microspectroscopy. For the first time, we correlate FTIR spectra derived from prostate cancer (pCA) tissue with Gleason score and the clinical stage of the tumour at time of biopsy. Serial sections from paraffin-embedded pCA tissue were collected. One was stained with hematoxylin and eosin and Gleason scored; FTIR spectra were collected from malignant locations using a second unstained section. FTIR spectra, representing different Gleason grades, were used to construct a diagnostic classifier for pCA using linear discriminant analysis (LDA). This model was blind tested using 383 IR spectra from 36 biopsies. Using a three-band Gleason criteria, we obtained sensitivity of ≥70% for the FTIR-LDA model to predict Gleason <7, = 7, and >7, with specificities of ≥81%. Using a threshold of Gleason/FTIR-LDA score of ≥8, we obtained a sensitivity and specificity of 71% and 67%, respectively, for the correlation with metastatic tumours using the FTIR-LDA system and 85% and 63%, respectively, for the correlation of metastatic tumours using the Gleason system. There is a correlation between tissue architecture using Gleason score with tissue biochemistry using FTIR-LDA. Both systems are similar in their performance in predicting metastatic behaviour in tumours from individual patients.
KW - FTIR microspectroscopy
KW - Gleason grade
KW - molecular diagnosis
KW - multivariate analysis
KW - prostate cancer
KW - tumour stage
UR - http://www.scopus.com/inward/record.url?scp=33748286685&partnerID=8YFLogxK
U2 - 10.1016/j.eururo.2006.03.031
DO - 10.1016/j.eururo.2006.03.031
M3 - Article
C2 - 16632188
AN - SCOPUS:33748286685
SN - 0302-2838
VL - 50
SP - 750
EP - 761
JO - European Urology
JF - European Urology
IS - 4
ER -
