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  • Title: The risk of occult invasive breast cancer after excisional biopsy showing in-situ ductal carcinoma of comedo pattern.
    Author: Hardman PD, Worth A, Lee U, Baird RM.
    Journal: Can J Surg; 1989 Jan; 32(1):56-60. PubMed ID: 2535949.
    Abstract:
    Between Jan. 1, 1985 and Aug. 31, 1987, 62 in-situ ductal carcinomas with a predominantly comedo pattern were identified in 61 patients in British Columbia from excisional biopsy of a palpable or mammographically demonstrable lesion of a breast. The biopsies were intended to remove the lesion completely. Fifty-seven (92%) of the 61 patients required wide re-excision or total mastectomy, usually within a month of the initial biopsy. Occult invasive disease was demonstrated in 14 of the re-excision specimens (24.5%) and residual in-situ carcinoma was present in a further 24 (42.1%), giving an overall rate of residual disease of 66.6%. Axillary lymph nodes were sampled in 54 cases. Metastases were found in two cases (3.7%) and each was associated with occult infiltrating ductal carcinoma in the breast. This suggests that in-situ ductal carcinoma having a predominant comedo pattern may be more widespread and associated with a higher incidence of invasive ductal carcinoma than is generally believed.
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