Monarch Disease Ontology identifier MONDO_0003274 (thoracic cancer) is a primary or metastatic malignant neoplasm affecting the tissues of the thorax. Also known as: cancer of thoracic segment of trunk, malignant neoplasm of the thorax, malignant neoplasm of thoracic segment of trunk, malignant neoplasm of thorax, malignant thoracic neoplasm, malignant thoracic segment of trunk neoplasm, malignant thoracic tumor, malignant thoracic tumour.