The expression of 17 JNK-related genes that play a role in PCa progression and bone metastasis (JUN, FOS, TP53, PTEN, PIK3CA, TWIST, AKT1, ALDH1A1, ATF4, BMP2, MAPK9, OPG, RANKL, PTHrP, RUNX2, TGFβ, and Wnt11) was measured by RT-qPCR in mice xenografts. The gene discussed is MAPK8; the disease is posterior cortical atrophy.