Dynamic Graph Multi-Scale Network for Breast Cancer Classification Using eXplainable Artificial Intelligence with Class Imbalance Mitigation in Medical and Healthcare Systems

In the era of artificial intelligence, pattern recognition techniques have become fundamental in advancing medical image processing, diagnosis, and automated disease classification systems. Among various clinical challenges, breast cancer is the second most dangerous leading cause of death in women worldwide. Early and accurate detection of breast cancer is crucial to develop advanced diagnostic methods to control further loss or reduce mortality rates. This study proposes a dynamic graph multi-scale network for breast cancer diagnosis, integrated with multi-scale convolutional feature extraction, a squeeze-and-excitation block, and a graph convolutional network to jointly model local spatial features and global contextual dependencies. To mitigate the limitations of the dataset, this work incorporated mammography-based augmentation techniques to enhance the datasets and also a synthetic minority oversampling technique to generate samples to balance the class and enhance model generalization. Several experiments are performed using large MIAS, INbreast, and DDSM mammogram datasets with an RTX-3080 GPU with hold-out split and cross-validation methods. Experimental results demonstrate that the proposed model achieves a 3.99% improvement compared to pretrained models, indicating its effectiveness in handling complex mammographic patterns. The approach achieves (0.9866–0.9943) accuracy with a confidence interval of 0.95 and $0.9882\pm 0.0048$ mean precision. The results demonstrate that the proposed approach significantly outperforms pretrained and existing models in terms of key performance metrics. Additionally, Grad-CAM is used to provide visual explanations, highlighting clinically relevant regions. The work demonstrates that the proposed approach performed more effectively in disease detection, offering transparent decision-making support, and enhance imaging-based screening techniques.