A primary or metastatic malignant neoplasm that affects the gums. The disease is gingival cancer (Monarch Disease Ontology identifier MONDO_0005507). Also known as: cancer of gingiva, gingiva cancer, malignant gingiva neoplasm, malignant gingival neoplasm, malignant gingival tumor, malignant gingival tumour, malignant gum neoplasm, malignant gum tumor.