LY6K and breast carcinoma: Higher Ly6K expression was correlated with breast cancer stage as seen by the significant higher expression of Ly6K in ductal stage N1+ (n=19) than ductal stage N0 (n=20) and invasive stage N1+ (n=9) than invasive stage N0 n=22) in Julka [110], and Stickeler [47] studies.