PTPRC and neoplasm: Of note, even in histologically confirmed tumor-positive SLN the contribution of non-immune CD45- cells (including potential tumor cells) in the SLN scrape samples was very modest, typically less than 5% (SLN+ range: 0.01–3.69%, mean: 0.835%, n = 14 vs. SLN- range: 0.02–4.54%, mean: 0.741%, n = 24), indicating that the observed changes in DC subset rates were not dependent on tumor cell numbers in the SLN.