Variability in gross and microscopic pathology reporting in excisional biopsies of breast cancer tissue.

Accurate and complete information in pathology reporting is essential since most breast cancer treatment decisions are based on pathologic findings. The College of American Pathologists (CAP) has guidelines for breast cancer reporting; however, pathology reports remain variable. Data were collected on 91 consecutive breast cancer excisional biopsies from "outside slide review" (OSR) cases for a 2-year period to determine the variability in pathology reports in gross and microscopic examinations from 50 different outside community and university hospitals located primarily in the southwestern United States. From the gross pathology report, the following items were analyzed: measurement and weight of specimens, orientation provided by surgeons, number of blocks submitted, designation of margins, and whether margins were indicated as "shaved" or "perpendicular" in relation to the breast tissue at the time of grossing. From the final diagnoses, the following items were analyzed: type and size of tumor, and surgical margins. The results show that 100% of the reports documented the measurement of specimen size, and 30% documented the specimen weight. Surgeons provided orientation of the breast specimens in 65% of cases. Surgical margins were inked in 58%, while only 18% described how margins were submitted (either shaved or perpendicular to the mass). Only 30% of specimens were submitted in toto, 1% were submitted with an unknown amount of tissue, and 69% were submitted in representative sections with an average of 13 blocks for lumpectomies. In the final diagnoses, all reports had documentation of the tumor type and size of the invasive cancer; 26% of the final diagnoses had ductal carcinoma in situ (DCIS) and just 5% of those reports documented the size of the DCIS. The surgical margin status was reported in only 76% of the final diagnoses. This study shows that the pathology reports were heterogeneous with respect to reporting gross and microscopic final diagnoses from the variable hospitals.