MYL9 and gastric cancer: The risk scores of key genes were calculated using the formula mentioned in the method, and processes were as follows: risk score = (HR (MYLK) × MYLK expression level) + (HR (MYL9) × MYL9 expression level) + (HR (LUM) × LUM expression evaluation rate, risk score, and clinical features of GC patients can be estimated based on the total points) (Supplementary Table S1).