Heterogeneity of programmed death‐ligand 1 expression in thymic epithelial tumours between initial specimen and synchronous or metachronous metastases or recurrences.

The article offers information on thymic epithelial tumours (TET) that are rare malignant neoplasms. It mentions that complete resection is the curative treatment focused on the choice. It focuses on the interobserver reproducibility and temporal heterogeneity of PD-L1 expression on tumour cells of TET patients.