CXCR6 and ovarian cancer: We used CD103 for identifying Trm cells, as it is considered a canonical marker for Trm cells and predicts favorable outcomes in patients with ovarian cancer.31 32 While mRNA expression of most chemokine receptors demonstrated no clear differences between Trm and non-Trm, Trm cells consistently showed significant upregulation of CXCR6 mRNA compared with non-Trm cells (figure 1A).