ITGAE and cholangiocarcinoma: The Proximity of PD-1&lt;sup&gt;-&lt;/sup&gt;CD103&lt;sup&gt;+&lt;/sup&gt; Tissue-Resident CD8&lt;sup&gt;+&lt;/sup&gt; T Cells to Tumor Cells Is Correlated with Improved Clinical Outcomes in Patients with Cholangiocarcinoma.