SCGAN: Sparse CounterGAN for Counterfactual Explanations in Breast Cancer Prediction

Abstract

Imaging phenotypes extracted via radiomics of magnetic resonance imaging have shown great potential in predicting the treatment response in breast cancer patients after administering neoadjuvant systemic therapy (NST). Understanding the causal relationships between the treatment response and Imaging phenotypes, Clinical information, and Molecular (ICM) features are critical in guiding treatment strategies and management plans. Counterfactual explanations provide an interpretable approach to generating causal inference. However, existing approaches are either computationally prohibitive for high dimensional problems, generate unrealistic counterfactuals, or confound the effects of causal features by changing multiple features simultaneously. This paper proposes a new method called Sparse Coun-teRGAN (SCGAN) for generating counterfactual instances to reveal causal relationships between ICM features and the treatment response after NST. The generative approach learns the distribution of the original instances and, therefore, ensures that the new instances are realistic. We propose dropout training of the discriminator to promote sparsity and introduce a diversity term in the loss function to maximize the distances among generated counterfactuals. We evaluate the proposed method on two publicly available datasets, followed by the breast cancer dataset, and compare their performance with existing methods in the literature. Results show that SCGAN generates sparse and diverse counterfactual instances that also achieve plausibility and feasibility, making it a valuable tool for understanding the causal relationships between ICM features and treatment response.

Revolutionizing Personalized Medicine with Generative AI: A Systematic Review

“…A recent scholarly article (Pearl, 2018) contended that counterfactual explanations have the potential to offer the utmost interpretability in machine learning models and can serve as a foundation for generating causal inferences. Taking this into account the paper (Zhou et al, 2023) proposes a new method called Sparse CounteRGAN (SCGAN) to generate counterfactual explanations for predicting the response of breast cancer patients to neoadjuvant systemic therapy (NST). SCGAN aims to overcome the limitations of existing counterfactual generation methods by producing counterfactuals that are sparse, diverse, and plausible while maintaining proximity to the original instances.…”