XCR1 is differentially expressed in brain metastatic human breast cancer.
Metastasis to the brain is a clinical problem in patients with breast cancer (1-3). We mined published microarray data (4, 5) to compare primary and metastatic tumor transcriptomes for the discovery of genes associated with brain metastasis in humans with metastatic breast cancer. We found that the receptor for chemokines XCL1 and XCL2, the X-C motif chemokine receptor 1, encoded by XCR1, was among the genes whose expression was most different in the brain metastases of patients with metastatic breast cancer as compared to primary tumors of the breast (4). XCR1 was also differentially expressed in the tumor cells of patients with triple negative breast cancer (5). XCR1 mRNA was present at increased quantities in brain metastatic tissues as compared to primary tumors of the breast. Importantly, expression of XCR1 in primary tumors was significantly correlated with patient recurrence-free survival. Modulation of XCR1 expression may be relevant to the biology by which tumor cells metastasize from the breast to the brain in humans with metastatic breast cancer.