KLK3 and neoplasm: Moreover, BMP4 and BMP2 mRNA levels were inversely correlated to several of the transcript levels selected to mirror AR activity in tumor cells as shown here for BMP4; KLK3 (Rs = −0.38, p = 0.019, n = 39), STEAP2 (Rs = −0.37, p = 0.020, n = 39), FOXA1 (Rs = −0.31, p = 0.053, n = 39), HOXB13 (Rs = −0.57, p = 0.00014, n = 39), and NKX3.1 (Rs = −0.41, p = 0.0092, n = 39).