Occult breast carcinoma presenting with axillary lymph node metastases

Area of Science:

• Oncology
• Surgical Pathology
• Breast Cancer Research

Background:

• Occult primary breast carcinoma, presenting as axillary metastasis with an unknown primary, is a rare clinical scenario.
• Previous studies often cover long time spans with varied diagnostic and treatment modalities, limiting recent insights.
• This study focuses on recent experience at the University of Alabama at Birmingham (UAB) for this specific breast cancer presentation.

Purpose of the Study:

• To review the clinicopathological data and outcomes of patients with occult primary breast cancer presenting with axillary metastasis.
• To evaluate the effectiveness of diagnostic and treatment approaches in a recent cohort.
• To provide evidence-based recommendations for managing this uncommon breast cancer presentation.

Main Methods:

• Retrospective review of clinicopathological data from female patients diagnosed with axillary adenocarcinoma metastasis of unknown primary origin.
• Inclusion criteria: normal clinical breast examination and mammography.
• Study period: 1985-1998 at UAB.

Main Results:

• Ten patients were identified, with a mean age of 56 years; 60% were white and postmenopausal.
• All patients had biopsy-proven adenocarcinoma consistent with a breast primary.
• Nine patients received local breast treatment (mastectomy or conservation), and all received chemotherapy; axillary dissection was performed in all but one patient.
• With a mean follow-up of 48 months, six patients were alive with no evidence of disease, while four experienced distant metastasis and mortality.

Conclusions:

• Extensive work-up for occult primary breast cancer is not typically necessary when axillary metastasis is present.
• Axillary dissection is recommended for prognostic information and local control.
• Breast conservation therapy appears feasible and does not negatively impact local control or survival outcomes.