Disease severity, age, survival and circadian clock gene expression in gastric cancer (GC) patients. Disease severity (A), age (B), and survival (C, D) of 29 GC patients were correlated to the expression of eight circadian clock genes. The y-axis represents the relative messenger RNA expression level. The relative expression in cancerous tissues is calculated by ΔΔC
T. The expression in stage I/II (A), age < 60 years (B) survival > 2 years (C), and survival > 5 years (D) is designated 1 and the relative expression in stage III/IV (A), age > 60 years (B), and survival < 2 years (C), and survival < 5 years (D) is calibrated to obtain the fold change, respectively. Statistical significance (p < 0.05) was evaluated with a t-test.