Proteomic analysis for tissue samples of metastatic lymph nodes and primary tumor from breast cancer patients

Because of limited clinical cases, the natural history of occult breast cancer (OBC) is poorly understood and its proteomic signature remains unknown. We performed a quantitative proteomic analysis for tissue samples of metastatic lymph nodes from 3 OBC patients, and paired tissue samples of metastatic lymph nodes and primary tumor from 3 Non-OBC patients.