BCAM and neoplasm: In the present study, we sought (i) to clarify the origins and structure of sBCAM in OC, (ii) to study metastasis‐related functions of the soluble and the two membrane‐bound isoforms of BCAM and (iii) to apply experimental models mimicking the in vivo situation, including tumour cell spheroids, co‐cultures of tumour and mesothelial cells, explanted omentum and a mouse model of peritoneal colonisation.