The objective was to assess which image-based criteria can be best accurately determined at MDCT and which results in least overtreatment.
Materials and methods
A total of 110 consecutive patients, who underwent curative surgery for colon cancer, were included in this retrospective study. Five radiologists independently assessed the longitudinal diameter of cancer as well as T- and N-categories. The five image-based criteria (T3cd/T4, T3/T4, T3/T4 or N+, T3cd/T4 or N2, and T3/T4 with ≥ 4 cm) were evaluated in terms of diagnostic accuracy, interreader agreement, and overtreatment risk using pooled receiver-operating curve and Fleiss kappa analyses. Pathologic high-risk stage II or III was used as a reference standard for assessment of overtreatment risk.
The diagnostic accuracy of multireaders was in the acceptable range (pooled area under curve (AUC): 0.751–0.829). T3/T4 showed the highest AUC (0.829) in terms of diagnostic accuracy. T3/T4 with ≥ 4 cm showed the highest kappa value (κ = 0.695) followed by T3/T4 (κ = 0.623), indicating substantial agreement. The other three criteria revealed moderate agreement (κ = 0.558–0.577). In terms of overtreatment ratio, T3cd/T4 and T3cd/T4 or N2 showed relatively lower ratios (T3cd/T4, 2.2%; T3cd/T4 or N2, 2.9%), whereas T3/T4 and T3/T4 or N+ revealed higher ratios (T3/T4, 8.7%; T3/T4 or N+, 9.5%).
T3/T4 was the best criterion in terms of diagnostic accuracy. However, in terms of interreader agreement and overtreatment risk, T3/T4 with ≥ 4 cm and T3cd/T4 were better as potential image-based criteria of neoadjuvant chemotherapy for colon cancer.
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Park, H., Cho, S.H., Kim, J.E. et al. Potential image-based criteria of neoadjuvant chemotherapy for colon cancer: multireaders’ diagnostic performance. Abdom Radiol 45, 2997–3006 (2020). https://doi.org/10.1007/s00261-019-02243-5
- Colon cancer
- Multidetector computed tomography (MDCT)
- Preoperative chemotherapy
- Neoadjuvant chemotherapy