Jiaying Shi

1 Introduction Breast cancer (BRCA) is the leading cause of cancer incidence in women worldwide, with its lethality primarily driven by the development of distant metastases [1]. A significant fraction of patients with early-stage disease eventually relapse with incurable metastatic tumors, often years after initial therapy [2].

A complementary item is an item that pairs well with another item when consumed together. In the context of e-commerce, providing recommendations for complementary items is essential for both customers and stores. Current models for suggesting complementary items often rely heavily on user behavior data, such as co-purchase relationships. However, just because two items are frequently bought together does not necessarily mean they are truly complementary.