Prognostic Paradox of Breast Invasive Micropapillary Carcinoma

Invasive micropapillary carcinoma of the breast is a rare subtype of breast cancer with a unique "inside out" polarity reversal pattern. Despite exhibiting extremely high rates of lymphatic vessel invasion (LVI) and regional lymph node metastasis, large clinical cohorts often observe long-term survival outcomes that are not inferior or even superior to those of ordinary non-specific invasive cancer (IBC-NST), leading to a long-standing controversy over the "clinical prognosis paradox." This article comprehensively summarizes the multidimensional factors that have led to this controversy, pointing out that the enormous survival benefits brought by systemic treatment largely mask its invasive morphological features. At the same time, this article deeply analyzes the multi-omics molecular mechanisms that drive its early metastasis, and systematically evaluates the application of predictive models in precise risk stratification of invasive micropapillary carcinoma (IMPC). In the future, unifying the pathological diagnostic threshold of "pure type" IMPC, integrating multimodal omics data, and constructing a rigorously validated artificial intelligence decision support system will be the key direction for achieving personalized and precise diagnosis and treatment of IMPC.