PIK3CA expression. (A) mRNA expression levels of PIK3CA in SCCs compared to normal ectocervical epithelium determined by quantitative RT-PCR. The upper and lower boundaries of the boxes represent the 75th to 25th percentile, bars within the boxes represent the median value. Whiskers represent the minimum and maximum values. (B) Representative pictures of immunostainings for PIK3CA on a cervical carcinoma specimen (left) and normal cervical epithelium (right) (20× magnification).