Clear cell renal cell carcinoma: identifying PTEN expression on multiphasic MDCT

Jonathan R Young, Heidi Coy, Hyun J. Kim, Michael Douek, Anthony Sisk, Allan J. Pantuck, Steven S. Raman

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Purpose: To investigate whether multiphasic MDCT enhancement profiles can help to identify PTEN expression in clear cell renal cell carcinomas (ccRCCs). Lack of PTEN expression is associated with worsened overall survival, a more advanced Fuhrman grade, and a greater likelihood of lymph mode metastasis. Methods: With IRB approval for this retrospective study, we derived a cohort of 103 histologically proven ccRCCs with preoperative 4-phase renal mass MDCT from 2001–2013. Following manual segmentation, a computer-assisted detection algorithm selected a 0.5-cm-diameter region of maximal attenuation within each lesion in each phase; a 0.5-cm-diameter region of interest was manually placed on uninvolved renal cortex in each phase. The relative attenuation of each lesion was calculated as [(Maximal lesion attenuation − cortex attenuation)/cortex attenuation] × 100. Absolute and relative attenuation in each phase were compared using t tests. The performance of multiphasic enhancement in identifying PTEN expression was assessed with logistic regression analysis. Results: PTEN-positive and PTEN-negative ccRCCs both exhibited peak enhancement in the corticomedullary phase. Relative corticomedullary phase attenuation was significantly greater for PTEN-negative ccRCCs in comparison to PTEN-positive ccRCCs (33.7 vs. 9.5, p = 0.03). After controlling for lesion stage and size, relative corticomedullary phase attenuation had an accuracy of 84% (86/103), specificity of 100% (84/84), sensitivity of 11% (2/19), positive predictive value of 100% (2/2), and negative predictive value of 83% (84/101) in identifying PTEN expression. Conclusion: Relative corticomedullary phase attenuation may help to identify PTEN expression in ccRCCs, if validated prospectively.

Original languageEnglish (US)
Pages (from-to)1-8
Number of pages8
JournalAbdominal Radiology
DOIs
StateAccepted/In press - Jun 27 2018

Keywords

  • Clear cell renal cell carcinoma
  • Multidetector computed tomography
  • PTEN
  • Renal cell carcinoma

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Gastroenterology
  • Urology

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    Young, J. R., Coy, H., Kim, H. J., Douek, M., Sisk, A., Pantuck, A. J., & Raman, S. S. (Accepted/In press). Clear cell renal cell carcinoma: identifying PTEN expression on multiphasic MDCT. Abdominal Radiology, 1-8. https://doi.org/10.1007/s00261-018-1672-3