disease has feature neoplasm RET fusion positive cancer https://github.com/monarch-initiative/mondo/issues/5538 Neoplasm associated with expression of a RET (REarranged during Transfection) fusion. RET fusion-positive tumors have been identified in a broad range of solid tumor types, including multiple endocrine neoplasia 2 (MEN2), papillary thyroid carcinoma (PTC), non-small cell lung cancer (NSCLC), invasive breast cancers, and pancreatic ductal adenocarcinomas in addition to colorectal adenocarcinoma, melanoma, small cell lung cancer, neuroblastoma, and small intestine neuroendocrine tumors. RET fusion positive neoplasm RET fusion positive solid tumor MONDO:0700216 RET fusion positive solid tumour RET Fusion Positive