PMID- 33139983 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20201104 IS - 2186-3644 (Print) IS - 2186-361X (Electronic) IS - 2186-3644 (Linking) VI - 9 IP - 4 DP - 2020 Nov TI - Primary neuroendocrine carcinoma of the breast: a rare presentation and review of the literature. PG - 233-246 LID - 10.5582/irdr.2020.03046 [doi] AB - Primary neuroendocrine carcinoma of the breast (NEBC) is a very rare occurrence accounting for less than 0.1% of all breast cancers. Typically, the tumor presents with ER- and PgR-positive and HER-2-negative status. Despite its luminal type, NEBC is associated with a more aggressive clinical course and poorer prognosis compared to the other types of invasive breast cancer. Clinical and radiological findings are nonspecific. The most common clinical manifestation is a palpable mass whereas in mammography the tumor most commonly appears as a round or oval mass without spiculated margins. Herein, a very rare case of NEBC is described in an asymptomatic patient who presented with an area of architectural distortion and the presence of microcalcifications that was incidentally detected on a screening mammography. A review of the literature has also been conducted. The diagnosis of NEBC requires a thorough investigation to exclude the possibility of a metastatic neuroendocrine tumor from another site because the two entities require different treatment approaches. Due to the rarity of the disease, the optimal therapeutic approach has not been clearly defined. Surgical resection is the mainstay of treatment. Further research is needed to better understand the molecular characteristics of NEBC and identify novel targeted therapies. CI - 2020, International Research and Cooperation Association for Bio & Socio - Sciences Advancement. FAU - Salemis, Nikolaos S AU - Salemis NS AD - Breast Cancer Surgery Unit, Army General Hospital, Athens, Greece. AD - IASO Women's Hospital, Athens, Greece. LA - eng PT - Case Reports PL - Japan TA - Intractable Rare Dis Res JT - Intractable & rare diseases research JID - 101586847 PMC - PMC7586876 OTO - NOTNLM OT - breast OT - carcinoma OT - neuroendocrine EDAT- 2020/11/04 06:00 MHDA- 2020/11/04 06:01 PMCR- 2020/11/01 CRDT- 2020/11/03 05:47 PHST- 2020/11/03 05:47 [entrez] PHST- 2020/11/04 06:00 [pubmed] PHST- 2020/11/04 06:01 [medline] PHST- 2020/11/01 00:00 [pmc-release] AID - 10.5582/irdr.2020.03046 [doi] PST - ppublish SO - Intractable Rare Dis Res. 2020 Nov;9(4):233-246. doi: 10.5582/irdr.2020.03046.