KRT81 and breast cancer: Moreover, it is unclear whether the expression was of the full length or truncated KRT81 due to the inherent 3′bias of the 10X Genomics platform.[39] Our study is the first to demonstrate an association between high tKRT81 expression in patient‐derived CTCs metastasized to the lung in vivo, as well as an association between high tKRT81 and poor survival in breast cancer patients.