Abstract
Purpose
The study aimed to evaluate the relationship between intra-tumor metabolic heterogeneity parameters of 18F-FDG and KRAS mutation status in colorectal cancer (CRC) patients and which threshold heterogeneity parameters could better reflect the heterogeneity characteristics of colorectal cancer.
Methods
Medical data of 101 CRC patients who underwent 18F-FDG PET/CT and KRAS mutation analysis were selected. On PET scans, 18F-FDG traditional indices maximum standardized uptake value (SUVmax), metabolic tumor volume (MTV), total lesion glycolysis (TLG), and heterogeneity parameters coefficient of variation with a threshold of 2.5 (CV2.5), CV40%, heterogeneity index-1 (HI-1), and HI-2 of the primary lesions were obtained. We inferred correlations between these 18F-FDG parameters and KRAS mutation status.
Results
41 patients (40.6%) had KRAS gene mutation. Assessment of FDG parameters showed that SUVmax (19.00 vs. 13.16, p < 0.001), MTV (11.64 vs. 8.83, p = 0.001), and TLG (102.85 vs. 69.76, p < 0.001), CV2.5 (0.55 vs. 0.46, p = 0.006), and HI-2 (14.03 vs. 7.59, p < 0.001) of KRAS mutation were higher compared to wild-type (WT) KRAS. CV40% (0.22 vs. 0.24, p = 0.001) was lower in the KRAS mutation group, while HI-1 had no significant difference between the two groups. Multivariate analysis showed that MTV (OR = 4.97, 1.04–23.83, p = 0.045) was the only significant predictor in KRAS mutation, using a cut-off of 7.62 (AUC = 0.695), and MTV showed a sensitivity of 90.2% and specificity of 45.0%. However, the PET parameters were not independent predictors in KRAS mutation.
Conclusion
KRAS gene mutant CRC patients had more 18F-FDG uptake (SUVmax, MTV, TLG) and heterogeneity (CV2.5, HI-2) than WT KRAS. MTV was the only independent predictor of KRAS gene mutation in colorectal cancer patients.
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Funding
This study was supported by the National and provincial key specialty construction plan (Grant number: Z155080000004), Anhui Provincial Key Research and Development Program Project, China (1804h08020294), and Anhui Provincial Natural Science Foundation for Youths, China (1908085QH364).
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GYG and WFL conceived of the presented idea. XL wrote the original draft. SCW performed the computations. MN and YFZ collected data. MN and QX performed manuscript editing. All authors discussed the results and contributed to the final manuscript.
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The article does not contain any studies with human participants or animals performed by any of the authors. The research protocol was approved by the Medical Ethics Committee of the First Affiliated Hospital of USTC (2021-RE-125).
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Liu, X., Wang, SC., Ni, M. et al. Correlation between 18F-FDG PET/CT intra-tumor metabolic heterogeneity parameters and KRAS mutation in colorectal cancer. Abdom Radiol 47, 1255–1264 (2022). https://doi.org/10.1007/s00261-022-03432-5
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DOI: https://doi.org/10.1007/s00261-022-03432-5