A few tumour types with relatively specific markers represent relevant exceptions, such as large cell calcifying Sertoli cell tumour (characterised by loss of PRKAR1A expression), intratubular large cell hyalinising Sertoli cell neoplasia (characterised by loss of STK11 expression) and inflammatory and nested testicular sex cord tumour (characterised by co‐expression of EMA and CD30). This evidence concerns the gene PRKAR1A and neoplasm.