Background
Bilateral male breast cancer remains a rare occurrence with limited representation in published literature. Here we present a case of an 82-yearold male with asynchronous bilateral breast cancer.
Case Presentation
Our patient is an 82-year-old male past smoker initially diagnosed with left T1aN0M0 invasive lobular carcinoma in 2010 that was ER, PR positive and HER2 negative. He underwent a left mastectomy with sentinel node biopsy and was given tamoxifen therapy for 10 years. In 2020, the patient was also diagnosed with lung squamous cell carcinoma and was treated with stereotactic body radiotherapy. In September 2023, he started noticing discharge from his right nipple. A PET CT scan revealed hyper-metabolic activity in the bilateral upper lung lobes and slightly increased activity in the right breast. A biopsy of the left upper lobe showed atypical cells. He also underwent a right breast mastectomy and sentinel lymph node biopsy which showed grade 1-2 ductal carcinoma in situ and negative sentinel lymph nodes. The tumor board recommended no further treatment after his mastectomy and genetic testing which is currently pending.
Discussion
Male breast cancer comprises just 1% of breast cancer cases, with asynchronous bilateral occurrences being exceedingly rare. A review of PubMed literature yielded only 2 documented case reports. Male breast cancer usually diagnosed around ages 60 to 70 years. The predominant histopathological diagnosis is invasive ductal adenocarcinoma that more frequently expresses ER/PR over HER2. It often manifests as a painless lump, frequently diagnosed at an advanced stage, possibly due to factors such as lower screening rates in males and less breast parenchyma. Local treatment options include surgery and radiotherapy. Neoadjuvant tamoxifen therapy is appropriate for ER and PR expressing cancers and chemotherapy can be used for non-hormone expressing or metastatic tumors. Given its rarity, management and diagnostic strategies for male breast cancer are often adapted from research on female breast cancer
Conclusions
Our case is of a relatively uncommon incident of asynchronous bilateral male breast cancer, emphasizing the need for expanded research efforts in male breast cancer. An enhanced understanding could lead to improved diagnosis and management strategies, potentially enhancing survival outcomes.
