Keywords: Breast, Cancer, breast cancer, neoadjuvant chemotherapyWe analyzed the correlation between MRI-based tumor shrinkage patterns after the early stage (first and second cycles) of NAC and pathological response in different subtypes. Fragmentation and diffuse decrease are collectively referred to as non-CS. We found that non-CS could be observed in some patients after the early stage of NAC, and non-CS and pCR were significantly correlated in HR+/HER2 subtypes after the first cycle of NAC.
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