Intravesical Ultrasonography for Tumor Staging in an Orthotopically Implanted Rat Model of Bladder Cancer

Hiroyuki Satoh, Yuji Morimoto, Tsunenori Arai, Hiroshi Asanuma, Satoko Kawauchi, Kenji Seguchi, Makoto Kikuchi, Masaru Murai

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Purpose: Noninvasive and serial evaluation of tumor development and growth is important in an orthotopic animal bladder tumor model. However, to our knowledge a reliable method has not been established. We determined the usefulness of intravesical ultrasonography for tumor staging and volumetric assessment in an animal model. Materials and Methods: Tumors with various stages were formed in 20 female Fischer F344 rats by implanting AY-27 rat bladder carcinoma cells. Cells were implanted by instilling a suspension (4 × 106 cells) into the bladder cavity after urothelial denudation using hydrochloric acid or by directly injecting the cell suspension into the bladder wall. Tumor volume and invasion depth were measured by intravesical ultrasonography using an ultrathin 2.5Fr intraluminal ultrasound catheter via the urethra 7 to 10 days after cancer cell implantation. The rats were then sacrificed for histopathological examination. Results: All rats showed bladder tumors 7 to 10 days after cancer cell implantation, of which stages varied from superficial to advanced disease. Intravesical ultrasonography showed a clear cross-sectional view of all layers of the bladder wall and enabled visualization of bladder tumors (minimal 0.5 mm in diameter). This approach also provided an accurate diagnosis of tumor invasion into muscle layers and perivesical tissues with precise invasion depth and tumor size. The positive predictive ratio regarding tumor staging reached 85%. Repeat examinations were feasible without noticeable adverse effects. Conclusions: Intravesical ultrasonography is a reliable and appropriate noninvasive method for evaluating tumor stage and size in an orthotopic rat bladder tumor model.

Original languageEnglish
Pages (from-to)1169-1173
Number of pages5
JournalJournal of Urology
Volume177
Issue number3
DOIs
Publication statusPublished - 2007 Mar

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Neoplasm Staging
Urinary Bladder Neoplasms
Ultrasonography
Urinary Bladder
Neoplasms
Inbred F344 Rats
Suspensions
Hydrochloric Acid
Urethra
Tumor Burden
Growth and Development
Catheters
Animal Models
Carcinoma
Muscles

Keywords

  • bladder
  • bladder neoplasms
  • experimental
  • inbred 344
  • neoplasms
  • rats
  • ultrasonography

ASJC Scopus subject areas

  • Urology

Cite this

Intravesical Ultrasonography for Tumor Staging in an Orthotopically Implanted Rat Model of Bladder Cancer. / Satoh, Hiroyuki; Morimoto, Yuji; Arai, Tsunenori; Asanuma, Hiroshi; Kawauchi, Satoko; Seguchi, Kenji; Kikuchi, Makoto; Murai, Masaru.

In: Journal of Urology, Vol. 177, No. 3, 03.2007, p. 1169-1173.

Research output: Contribution to journalArticle

Satoh, H, Morimoto, Y, Arai, T, Asanuma, H, Kawauchi, S, Seguchi, K, Kikuchi, M & Murai, M 2007, 'Intravesical Ultrasonography for Tumor Staging in an Orthotopically Implanted Rat Model of Bladder Cancer', Journal of Urology, vol. 177, no. 3, pp. 1169-1173. https://doi.org/10.1016/j.juro.2006.10.038
Satoh, Hiroyuki ; Morimoto, Yuji ; Arai, Tsunenori ; Asanuma, Hiroshi ; Kawauchi, Satoko ; Seguchi, Kenji ; Kikuchi, Makoto ; Murai, Masaru. / Intravesical Ultrasonography for Tumor Staging in an Orthotopically Implanted Rat Model of Bladder Cancer. In: Journal of Urology. 2007 ; Vol. 177, No. 3. pp. 1169-1173.
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AB - Purpose: Noninvasive and serial evaluation of tumor development and growth is important in an orthotopic animal bladder tumor model. However, to our knowledge a reliable method has not been established. We determined the usefulness of intravesical ultrasonography for tumor staging and volumetric assessment in an animal model. Materials and Methods: Tumors with various stages were formed in 20 female Fischer F344 rats by implanting AY-27 rat bladder carcinoma cells. Cells were implanted by instilling a suspension (4 × 106 cells) into the bladder cavity after urothelial denudation using hydrochloric acid or by directly injecting the cell suspension into the bladder wall. Tumor volume and invasion depth were measured by intravesical ultrasonography using an ultrathin 2.5Fr intraluminal ultrasound catheter via the urethra 7 to 10 days after cancer cell implantation. The rats were then sacrificed for histopathological examination. Results: All rats showed bladder tumors 7 to 10 days after cancer cell implantation, of which stages varied from superficial to advanced disease. Intravesical ultrasonography showed a clear cross-sectional view of all layers of the bladder wall and enabled visualization of bladder tumors (minimal 0.5 mm in diameter). This approach also provided an accurate diagnosis of tumor invasion into muscle layers and perivesical tissues with precise invasion depth and tumor size. The positive predictive ratio regarding tumor staging reached 85%. Repeat examinations were feasible without noticeable adverse effects. Conclusions: Intravesical ultrasonography is a reliable and appropriate noninvasive method for evaluating tumor stage and size in an orthotopic rat bladder tumor model.

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