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. 2019 Mar 1;30(3):431-438.
doi: 10.1093/annonc/mdz001.

Development and validation of an individualized nomogram to identify occult peritoneal metastasis in patients with advanced gastric cancer

D Dong  1 , L Tang  2 , Z-Y Li  3 , M-J Fang  4 , J-B Gao  5 , X-H Shan  6 , X-J Ying  3 , Y-S Sun  2 , J Fu  2 , X-X Wang  6 , L-M Li  5 , Z-H Li  7 , D-F Zhang  7 , Y Zhang  3 , Z-M Li  3 , F Shan  3 , Z-D Bu  3 , J Tian  8 , J-F Ji  9
Affiliations

Development and validation of an individualized nomogram to identify occult peritoneal metastasis in patients with advanced gastric cancer

D Dong et al. Ann Oncol. .

Abstract

Background: Occult peritoneal metastasis (PM) in advanced gastric cancer (AGC) patients is highly possible to be missed on computed tomography (CT) images. Patients with occult PMs are subject to late detection or even improper surgical treatment. We therefore aimed to develop a radiomic nomogram to preoperatively identify occult PMs in AGC patients.

Patients and methods: A total of 554 AGC patients from 4 centers were divided into 1 training, 1 internal validation, and 2 external validation cohorts. All patients' PM status was firstly diagnosed as negative by CT, but later confirmed by laparoscopy (PM-positive n = 122, PM-negative n = 432). Radiomic signatures reflecting phenotypes of the primary tumor (RS1) and peritoneum region (RS2) were built as predictors of PM from 266 quantitative image features. Individualized nomograms of PM status incorporating RS1, RS2, or clinical factors were developed and evaluated regarding prediction ability.

Results: RS1, RS2, and Lauren type were significant predictors of occult PM (all P < 0.05). A nomogram of these three factors demonstrated better diagnostic accuracy than the model with RS1, RS2, or clinical factors alone (all net reclassification improvement P < 0.05). The area under curve yielded was 0.958 [95% confidence interval (CI) 0.923-0.993], 0.941 (95% CI 0.904-0.977), 0.928 (95% CI 0.886-0.971), and 0.920 (95% CI 0.862-0.978) for the training, internal, and two external validation cohorts, respectively. Stratification analysis showed that this nomogram had potential generalization ability.

Conclusion: CT phenotypes of both primary tumor and nearby peritoneum are significantly associated with occult PM status. A nomogram of these CT phenotypes and Lauren type has an excellent prediction ability of occult PM, and may have significant clinical implications on early detection of occult PM for AGC.

Keywords: advanced gastric cancer; occult peritoneal metastasis; radiomic nomogram.

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Figures

Figure 1.
Figure 1.
Radiomics workflow in this study. During the image segmentation, any detectable large blood vessels were excluded from the ROIs.
Figure 2.
Figure 2.
Development and performance of nomogram. (A) Nomogram based on radiomic signatures and clinical factors. Calibration curves of the radiomic nomogram in the training cohort (B) and validation cohorts (C).
Figure 3.
Figure 3.
Decision curve analysis for radiomic nomogram and signatures.
See this image and copyright information in PMC

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