Period Family of Clock Genes as Novel Predictors of Survival in Human Cancer: A Systematic Review and Meta-Analysis

Figure 2

Forest plot of the HR for the relationship between PER family expression and OS. (a) Pooled HR for PER1 protein expression and OS. The detection method of PER1 protein level was IHC. (b) Pooled HR for PER2 protein expression and OS. The detection method of PER2 protein level was IHC. (c) Pooled HR for PER2 mRNA expression and OS. The detection method of PER2 mRNA expression was qRT-PCR. (d) Pooled HR for PER3 protein expression and OS. The detection method of PER3 protein level was IHC.

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