Stereotactic breast biopsy: A study of first core samples

Stereotactic core needle biopsy (SCNB) is a sensitive and specific indicato r of breast pathology. Commonly the first biopsy core is taken from the cen ter of the lesion in question. Multiple cores are then taken from points pe ripheral to the central core. The sensitivity and specificity of the centra l core to diagnose breast disease is unclear. We compared the pathology of the central core biopsy with that of the remaining cores in a prospective s tudy to determine the sensitivity and specificity of the central core to di agnose breast disease. All patients undergoing SCNB for breast lesions in a single surgical office during a 7-month period were eligible for inclusion . One hundred thirty-three patients with first cores from 145 biopsy sites were included. The histologic diagnosis from 117 (81%) of the first cores f rom these 145 biopsy sites were representative of their respective samples as a whole. Seventy-seven (53%) of the first cores were in complete agreeme nt with the final histologic diagnosis whereas 40 (28%) had minor differenc es with the histologic diagnosis that had little or no clinical significanc e. Twenty-eight (19%) central core samples did not agree with the final pat hologic diagnosis. Seven of these 28 patients each had a final diagnosis of cancer missed by the central core biopsy. The first core sample had a sens itivity for cancer detection of 79 per cent and specificity 100 per cent. S CNB remains a sensitive and specific identifier of breast pathology. When m ammographic evidence of calcifications was the primary indication for SCNB (n = 75) calcification was present in the central core in 51 (68%). In thes e 51 patients the central core biopsy was in agreement with the final histo logic diagnosis in 46 (90%) specimens. Histologic review of the first core sample alone lends no increased benefits and in fact misrepresents the path ology present in a significant number of patients. When analyzed as an inde pendent predictor of breast pathology the first core is a more sensitive in dicator than subsequent individual cores, but the most accurate predictor o f pathology is examination of the entire group of core samples. This study confirms the need for acquisition of multiple cores from each lesion in que stion.