Abstract

The accuracy of modern imaging techniques for the diagnosis of peritoneal carcinomatosis is poor. A breast cancer patient with a high serum CA15-3 level did not receive a definitive diagnosis of peritoneal dissemination by imaging examination and then underwent laparoscopy. Pathological examination showed peritoneal dissemination of breast cancer, but the biological markers were different from the primary lesion: ER(−), PgR(−), and Her2:3 +. T-DM1 therapy was very effective, and her systemic symptoms disappeared. Since biomarkers of metastatic lesions may sometimes change, laparoscopic biopsy is very important and useful.

Highlights

  • Case reportBreast cancer is the most common cancer in women and can metastasize to many organ sites

  • The case of a patient with peritoneal dissemination from breast cancer diagnosed by laparoscopy is presented in which the biomarkers differed from those of the primary lesion on pathological examination, which could be very useful information for subsequent systemic treatment

  • Bertozzi et al reported that peritoneal carcinomatosis of breast cancer had a prevalence of 0.7%

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Summary

Introduction

Case reportBreast cancer is the most common cancer in women and can metastasize to many organ sites. Keywords Breast cancer · Peritoneal dissemination · Laparoscopy Peritoneal dissemination from breast cancer is uncommon and a life-threatening condition with a very high mortality rate. The accuracy of modern imaging techniques for the diagnosis of peritoneal carcinomatosis is poor.

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