A cell type cancer that has_material_basis_in abnormally proliferating cells derived_from two germinal layers of tissue. The disease is mixed cell type cancer (Experimental Factor Ontology identifier EFO_0007373). Also known as: Mixed Tumor, Malignant, malignant mixed cancer, malignant mixed neoplasm, mixed tumor, mixed tumor, malignant (morphologic abnormality), mixed tumor, malignant, NOS (morphologic abnormality).