Calretinin (CAB29, calbindin 2) is a calcium binding protein that belongs to the calbindin family. It is mainly found in neuronal tissue, highly expressed in auditory neurons. It has been implicated as a calcium buffer, calcium sensor, and regulator of apoptosis (1). Calretinin is considered a specific marker of mesothelial cells; it is the only marker that has can distinguish between sarcomatoid mesotheliomas and sarcomatoid renal cell carcinomas (2). It is widely used in a panel of markers for distinguishing mesothelioma from adenocarcinoma. Along with calretinin, the panel includes E-cadherin, CEA, and cytokeratin 5/6 (3).
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