Monarch Disease Ontology entry MONDO_0006056 (squamous cell breast carcinoma) is a rare carcinoma that arises from the breast parenchyma and is entirely composed of squamous cells. Also known as: breast primary squamous cell carcinoma, breast squamous cell carcinoma, primary squamous cell breast carcinoma, primary squamous cell carcinoma of breast, primary squamous cell carcinoma of the breast, scc of breast, scc of the breast, squamous breast carcinoma.