Then, we used the mAbs Kao1 and Kao2/3 (thereafter referred to as Kao2) to examine the expression of Piwil2 and PL2L proteins in the tissue microarray (TMA) cores of human breast (n = 300) and cervical cancers (n = 100) or in some tissues sections of the cancers. Here, PIWIL2 is linked to cervical cancer.