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Using clinical and radiomic feature–based machine learning models to predict pathological complete response in patients with esophageal squamous cell carcinoma receiving neoadjuvant chemoradiation

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Abstract

Objective

This study aimed to build radiomic feature-based machine learning models to predict pathological clinical response (pCR) of neoadjuvant chemoradiation therapy (nCRT) for esophageal squamous cell carcinoma (ESCC) patients.

Methods

A total of 112 ESCC patients who underwent nCRT followed by surgical treatment from January 2008 to December 2018 were recruited. According to pCR status (no visible cancer cells in primary cancer lesion), patients were categorized into primary cancer lesion pCR (ppCR) group (N = 65) and non-ppCR group (N = 47). Patients were also categorized into total pCR (tpCR) group (N = 48) and non-tpCR group (N = 64) according to tpCR status (no visible cancer cells in primary cancer lesion or lymph nodes). Radiomic features of pretreatment CT images were extracted, feature selection was performed, machine learning models were trained to predict ppCR and tpCR, respectively.

Results

A total of 620 radiomic features were extracted. For ppCR prediction models, radiomic model had an area under the curve (AUC) of 0.817 (95% CI: 0.732–0.896) in the testing set; and the combination model that included rad-score and clinical features had a great predicting performance, with an AUC of 0.891 (95% CI: 0.823–0.950) in the testing set. For tpCR prediction models, radiomic model had an AUC of 0.713 (95% CI: 0.613–0.808) in the testing set; and the combination model also had a great predicting performance, with an AUC of 0.814 (95% CI: 0.728–0.881) in the testing set.

Conclusion

This study built machine learning models for predicting ppCR and tpCR of ESCC patients with favorable predicting performance respectively, which aided treatment plan optimization.

Clinical relevance statement

This study significantly improved the predictive value of machine learning models based on radiomic features to accurately predict response to therapy of esophageal squamous cell carcinoma patients after neoadjuvant chemoradiation therapy, providing guidance for further treatment.

Key Points

Combination model that included rad-score and clinical features had a great predicting performance.

Primary tumor pCR predicting models exhibit better predicting performance compared to corresponding total pCR predicting models.

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Abbreviations

AUC:

Area under the curve

BMI:

Body mass index

CT:

Computed tomography

CTV:

Clinical target volume

EC:

Esophageal cancer

ESCC:

Esophageal squamous cell carcinoma

GTV:

Gross tumor volume

KPS:

Karnofsky performance status

LOOCV:

Leave-one-out cross-validation

MRI:

Magnetic resonance imaging

nCRT:

Neoadjuvant chemoradiotherapy

NPV:

Negative predictive value

OAR:

Organs at risk

OS:

Overall survival

pCR:

Pathological complete response

PD:

Program death

PET:

Positron emission tomography

PFS:

Progression-free survival

ppCR:

Primary tumor lesion pCR

PPV:

Positive predictive value

PTV:

Plan target volume

ROC:

Receiver operating characteristics

TNR:

True negative rate

tpCR:

Total pCR

TPR:

True positive rate

VOI:

Volumn of interest

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Funding

This work was supported by the grants from the Zhejiang province public welfare funds (No. GF20H160009) and the Medical Science and Technology Project of Zhejiang Province (No. 2020382901, and 2021455891).

Author information

Authors and Affiliations

Authors

Contributions

WJ: data collection, statistical analysis, and writing and revising the manuscript. ZX, ZJ, LC, SW: statistical analysis and revising the manuscript. ZJ, SXJ: patient administration, and data collection. FJ, LQR: patient administration, and critical revision of the manuscript. JYL and CQX study design, statistical analysis, critical revision of the manuscript, and funds collection.

Corresponding authors

Correspondence to Jin Wang, Qixun Chen or Yongling Ji.

Ethics declarations

Guarantor

The scientific guarantor of this publication Yongling Ji.

Conflict of interest

The authors declare that they have no competing interests.

Statistics and biometry

No complex statistical methods were necessary for this paper.

Informed consent

Not applicable.

Ethical approval

The study was approved by our hospital’s institutional review board.

Study subjects or cohorts overlap

No study subjects or cohorts have been previously reported.

Methodology

• retrospective

• observational

• performed at one institution

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Wang, J., Zhu, X., Zeng, J. et al. Using clinical and radiomic feature–based machine learning models to predict pathological complete response in patients with esophageal squamous cell carcinoma receiving neoadjuvant chemoradiation. Eur Radiol 33, 8554–8563 (2023). https://doi.org/10.1007/s00330-023-09884-7

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