The exact expression profiles of OTR in breast tumorsof differentsubtypes and stages remain an active research question; however, OTR-specificnuclear imaging tracers accumulated in breast malignancies in vivo, suggesting that OTR expression is sufficient fortumor-specific targeting, at least in the rodent models employed.127,128,156 More systematic studies investigatingOTR expression across a large panel of breast cancer patient sampleswill be critical in revealing cancer subtypes that display robustOTR overexpression to support tumor imaging and targeted radiotherapy. Here, OXTR is linked to breast cancer.