title: A case of mucinous carcinoma of the breast that demonstrated a good pathological response to neoadjuvant chemotherapy despite a poor clinical response.
abstract: A 30-year-old woman presented with a right breast tumor. Mucinous carcinoma was diagnosed by core needle biopsy (T2: 5 cm N1 M0). Despite receiving a neoadjuvant anthracycline and taxane regimen, the patient demonstrated no clinical response (NC). Based on the patient's strong preference, we performed breast-conserving surgery. On histological examination, we observed widespread mucus and a few viable malignant cells, a Grade 2 therapeutic response. Neither optimal management procedures nor guidelines for chemotherapy for primary mucinous carcinoma of the breast have been established. It is a reasonable assumption, however, that discordance between the clinical response and therapeutic response to neoadjuvant chemotherapy may occur in cases of mucinous carcinoma.
authors.affiliation: Breast Surgery Division, National Cancer Center Hospital, 5-1-1 Tukiji, Tokyo 104-0045, Japan.
authors.forename: Junpei
authors.initials: J
authors.lastname: Yamaguchi
authors.forename: Sadako
authors.initials: S
authors.lastname: Akashi-Tanaka
authors.forename: Takashi
authors.initials: T
authors.lastname: Fukutomi
authors.forename: Takayuki
authors.initials: T
authors.lastname: Kinosita
authors.forename: Eriko
authors.initials: E
authors.lastname: Iwamoto
authors.forename: Miyuki
authors.initials: M
authors.lastname: Takasugi
mesh_terms: D002288:Adenocarcinoma, Mucinous / Q000188:drug therapy* / Q000473:pathology / Q000601:surgery; D000328:Adult; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D001707:Biopsy, Needle; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000473:pathology / Q000601:surgery; D017024:Chemotherapy, Adjuvant; D003520:Cyclophosphamide / Q000008:administration & dosage; D015251:Epirubicin / Q000008:administration & dosage; D005260:Female; D005472:Fluorouracil / Q000008:administration & dosage; D006801:Humans; D020360:Neoadjuvant Therapy; D017239:Paclitaxel / Q000008:administration & dosage; D016896:Treatment Outcome
chemical_list: D015251:Epirubicin; D003520:Cyclophosphamide; D017239:Paclitaxel; D005472:Fluorouracil