GNRH1 and progressive pseudorheumatoid arthropathy of childhood: Finally, pathway analysis indicated that SNPs suggestively associated with PPD (P < 1e‐03) were significantly over‐represented in pathways involved in long‐term depression, salivary secretion, GnRH signaling, glutamatergic synapse, oxytocin signaling, cell adhesion molecules (CAMs), Rap1 signaling, and cancer‐related pathways.