Extensive intraductal component (invasive ductal carcinoma)
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Extensive intraductal component (EIC) in breast imaging evaluation is the pathological description where an invasive ductal carcinoma has a prominent intraductal component within it or if there is intraductal carcinoma, DCIS is present within sections of normal adjacent tissue. It is sometimes classified as tumors having DCIS occupying >25% of the area comprising the infiltration cancer and the presence of DCIS beyond the edge of the infiltrating cancer.
Tumors with EIC tends to be comparatively commoner in younger patients.
Treatment and prognosis
The presence of EIC is an often a significant factor in predicting local recurrence after breast-conserving surgery and radiotherapy. Tumors with EIC can have a recurrence rate of ~25% compared with 5-8% in tumors without EIC.
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