Performance of tumor growth kinetics as an imaging biomarker for response assessment in colorectal liver metastases: correlation with FDG PET

Adeel R. Seyal, Keyur Parekh, Atilla Arslanoglu, Fernanda D. Gonzalez-Guindalini, Sandra M. Tochetto, Yury Velichko, Vahid Yaghmai*

*Corresponding author for this work

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Purpose: To correlate RECIST, volumetric criteria, and tumor growth kinetics at multidetector-computed tomography with tumor metabolic activity at FDG PET in colorectal liver metastases (CRCLM) treated with bevacizumab-based chemotherapy. Methods: Thirty-two CRCLM in 20 patients treated with bevacizumab-based chemotherapy were evaluated. Pre- and post-treatment CT scans were used to calculate reciprocal of doubling time (RDT), percentage change in the lesion’s longest transaxial diameter (RECIST 1.1), and percentage change in the tumor volume. The accuracy of these parameters in predicting response based on standard uptake value analysis at FDG PET was assessed. Data were analyzed using Spearman’s correlation, student’s t, Mann–Whitney, Wilcoxon signed-rank, and Fisher’s exact tests. Results: According to FDG PET, 24/32 (75%) lesions were categorized as responders and 8/32 (25%) lesions as nonresponders. Based on RDT, 26/32 (81.25%) lesions were classified as responders and 6/32 (18.75%) lesions as nonresponders. Response classification according to RDT and FDG PET was concordant in 30/32 (93.75%) lesions, whereas RECIST 1.1 and volumetric criteria were concordant with FDG PET for 20/32 (62.5%) and 21/32 (65.63%) lesions, respectively. A strong association was found between RDT and response based on FDG PET (odds ratio = 127.4; 95% CI 5.54–2997; P < 0.0001). Conclusions: Tumor growth kinetics may be an effective imaging biomarker for response evaluation in CRCLM.

Original languageEnglish (US)
Pages (from-to)3043-3051
Number of pages9
JournalAbdominal Imaging
Volume40
Issue number8
DOIs
StatePublished - Oct 1 2015

Keywords

  • Colorectal cancer
  • Computed tomography
  • Liver metastases
  • RECIST
  • Tumor growth kinetics

ASJC Scopus subject areas

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

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