PDGFRL and gastric cancer: The risk score for each GC patient was calculated using the following formula: Risk Score = 0.0650 * SERPINE1 + 0.0411 * RGS2 + 0.0138 * PDGFRL + 0.0248 * STC1 + 0.103 * C5orf46 + 0.0271 * CST2 + 0.0372 * GPX3 + 0.0737 * SNCG.