LTBP4 and Familial prostate cancer: The reference-free diagnostic panel used the ratio of relative expression of three mRNAs that are overexpressed (FOLH1, XBP1 and HPN) to five mRNAs that are underexpressed (ITSN1, GSTM4, LTBP4, NELL2, and CFD) in prostate cancer compared to normal tissue.