Abstract | BACKGROUND: METHODS: In our study, four transverse, single-photon emission tomography (SPECT) images were isolated and regions of interest were selected and correlated with pretherapy prostate biopsy results. Prostate cancer and normal tissue prostate/muscle background (P/M) ratios were derived, so that postprostatectomy/ radiation therapy patients could be evaluated for the presence of residual prostate cancer. Twenty-three pretherapy prostate cancer patients with quadrant/sextant biopsies had SPECT 96-hr 111indium ProstaScint pelvic images. The four transverse 1-cm slices above the midline penile blood pool were chosen, and four to six 27-30-pixel regions of interest were placed over the prostate bed. The background muscle region of interest was placed over the external obturator muscle region. The P/M ratio was calculated and compared to the quadrant/sextant prostatic biopsy result. The same procedure was applied to 17 posttherapy prostate cancer patients with rising PSA. RESULTS: In the 23 pretherapy prostate cancer patients, there was a correlation between the P/M ratio of at least 3.0 in 32 of 35 prostatic cancer biopsy regions, and there was correlation with P/M ratios less than 3.0 in 82 of 89 negative biopsy regions. Seventeen posttherapy patients underwent ProstaScint studies. Six underwent biopsy, with typically one biopsy site per patient. All 6 had P/M ratios greater than 3.0 in the biopsied region. Five out of six biopsies revealed residual prostate cancer. CONCLUSIONS: A prostate/muscle ratio was developed from 111indium ProstaScint regions of interest obtained on 1-cm SPECT transverse slices through the prostate bed in 23 patients preprostatic cancer therapy. A P/M ratio above 3.0 correlated in the majority of positive cases, and a P/M ratio below 3.0 was demonstrated in negative prostatic biopsy cases. The P/M ratio of above 3.0 or below 3.0 also separated those posttherapy prostate cancer patients with rising PSA who had residual prostate carcinoma in the prostate bed.
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Authors | D B Sodee, R J Ellis, M A Samuels, J P Spirnak, W F Poole, C Riester, D M Martanovic, R Stonecipher, E M Bellon |
Journal | The Prostate
(Prostate)
Vol. 37
Issue 3
Pg. 140-8
(Nov 01 1998)
ISSN: 0270-4137 [Print] United States |
PMID | 9792131
(Publication Type: Journal Article)
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Chemical References |
- Antibodies, Monoclonal
- Indium Radioisotopes
- Prostate-Specific Antigen
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Topics |
- Aged
- Antibodies, Monoclonal
- Biopsy
- Humans
- Indium Radioisotopes
- Male
- Middle Aged
- Prostate
(pathology)
- Prostate-Specific Antigen
(immunology)
- Prostatic Neoplasms
(diagnostic imaging, pathology)
- Tomography, Emission-Computed, Single-Photon
(methods)
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