Automated Prediction of Complete Pathological Response to Neo-Adjuvant
Chemoradiotherapy Using Hybrid Model -Based MRI Radiomics in Locally
Advanced Cervical Cancer
Abstract
Background: To develop a model that could automatically predict
treatment response (pathologic complete response (pCR or non-pCR) for
patients with locally advanced cervical cancer (LACC) based on
T2-weighted MR images and clinical parameters. Methods: A total of 138
patients were en-rolled, T2-weighted MR images and clinical information
of the patients before treatment were collected. Clinical information
includes age, stage, pathological type, squamous cell carcinoma (SCC)
level, and lymph node status. A hybrid model extracted the domain
specific features from computational radiomics system, the abstract
features from deep learning network and the clinical parameters, and
employed an ensemble learning classifier to predict pCR. The area under
curve (AUC), accuracy (ACC), true positive rate (TPR), true negative
rate (TNR) and precision were used as evaluation metrics. Results: Among
138 LACC patients, 74 were in the pCR group and 64 were in the non-pCR
group. There was no significant difference between the two cohorts in
terms of tumor diameter, lymph node and stage before radiotherapy,
p=0.787, 0.068, 0.846, respectively. The average AUC, ACC, TPR, TNR and
precision of the proposed hybrid model was about 0.80, 0.71, 0.75, 0.66
and 0.71, while The AUC values of using clinical parameters, domain
specific features, abstract features alone were 0.61, 0.67 and 0.76,
respectively. The AUC value of model without ensemble learning
classifier was 0.76. Conclusions: The proposed hybrid model could
predict well the treatment response of patients with LACC, which might
help radiation oncologist to make personalized treatment plans for
patients.