Mammary-like vulvar adenocarcinoma (MLVA) is an exceedingly rare subtype of vulvar adenocarcinoma that shares features with mammary gland tissue. Due to its rarity and lack of consensus, MLVA presents diagnostic challenges to pathologists. We present the case of a 59-year-old female with an ulcerated mass on the right side of the external genitalia, diagnosed as MLVA. Comprehensive immunohistochemistry (IHC) and gene sequencing studies were performed to characterize the tumor. IHC analysis revealed triple expression of hormonal receptors (estrogen receptor, progesterone receptor, and HER2), supporting the mammary gland origin of the tumor. Gene sequencing identified unique genetic mutations associated with the expression of hormonal markers. One fusion gene (ERBB2-NAGLU) has not been reported in any tumors, and other mutations with unique mutation types have not been previously reported in MLVA. Our findings shed light on the molecular characteristics of MLV and may help improve the diagnosis and treatment of this rare type of vulvar adenocarcinoma.
Keyphrases
- copy number
- estrogen receptor
- genome wide
- squamous cell carcinoma
- locally advanced
- poor prognosis
- sentinel lymph node
- single cell
- case report
- genome wide identification
- dna methylation
- binding protein
- polycystic ovary syndrome
- gene expression
- rectal cancer
- neoadjuvant chemotherapy
- adipose tissue
- long non coding rna
- radiation therapy
- lymph node
- metabolic syndrome