You will be shown an abstract from a biomedical research paper. Given this abstract, your task is to extract all unique entities of the following types: ["AnatomicalEntity"].

Please return the output as a JSON object of the format: {"AnatomicalEntity": ["tumor cells", ...]}. The keys should be entity types and values should be lists of extracted entities belonging to the corresponding type. If you cannot find entities belonging to a specific type, the value should be [].

Only output the JSON object and do not include any additional text.

Abstract:

Molecular mediators of interactions with extracellular matrix components in metastasis and angiogenesis.
Metastasis and tumor angiogenesis are invasive phenomena and share many common properties at the physiological level and some similarities at the molecular level. Each consists of repetitive cycles of interaction with adjacent extracellular matrix components by mediating cellular adhesion, matrix dissolution, and cellular motility to achieve metastasis of cancer cells or neovascularization of tumors. Molecular factors which implement this triad of events are reviewed, as are several signal transduction components which may regulate them. Some potentially promising prognostic, diagnostic, and therapeutic modalities for tumor angiogenesis and metastatic disease are also discussed.
{"AnatomicalEntity": ["tumors", "extracellular matrix components", "matrix", "tumor", "metastatic disease", "cancer cells", "cellular"]}