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In Frontiers in molecular biosciences

Objective : To obtain molecular information in slides directly from H&E staining slides, which apparently display morphological information, to show that some differences in molecular level have already encoded in morphology.

Methods : In this paper, we selected Ki-67-expression as the representative of molecular information. We proposed a method that can predict Ki-67 positive cells directly from H&E stained slides by a deep convolutional network model. To train this model, we constructed a dataset containing Ki-67 negative or positive cell images and background images. These images were all extracted from H&E stained WSIs and the Ki-67 expression was acquired from the corresponding IHC stained WSIs. The trained model was evaluated both on classification performance and the ability to quantify Ki-67 expression in H&E stained images.

Results : The model achieved an average accuracy of 0.9371 in discrimination of Ki-67 negative cell images, positive cell images and background images. As for evaluation of quantification performance, the correlation coefficient between the quantification results of H&E stained images predicted by our model and that of IHC stained images obtained by color channel filtering is 0.80.

Conclusion and Significance : Our study indicates that the deep learning model has a good performance both on prediction of Ki-67 positive cells and quantification of Ki-67 expression in cancer samples stained by H&E. More generally, this study shows that deep learning is a powerful tool in exploring the relationship between morphological information and molecular information.

Availability and Implementation : The main program is available at https://github.com/liuyiqing2018/predict_Ki-67_from_HE.

Liu Yiqing, Li Xi, Zheng Aiping, Zhu Xihan, Liu Shuting, Hu Mengying, Luo Qianjiang, Liao Huina, Liu Mubiao, He Yonghong, Chen Yupeng

2020

Ki-67, deep learning, digital pathology, fully convolutional network, immunohistochemistry, neuroendocrine tumor