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An example of a serous tubal intraepithelial carcinoma (STIC) (from patient 9). Hematoxylin and eosin (H&E) stain shows a discrete papillary growth of STIC without evidence of stromal invasion. The epithelial cells of the STIC are intensely positive for p53 and p16. The Ki-67 labeling index is high (>70%).
