Systemic inflammatory parameters, such as the elevator PLR (platelet-lymphocyte ratio), have been found to be associated with the prognosis in gastric cancer (GC); however, the results remain controversial. So we aimed to evaluate the prognostic role of the PLR in gastric cancer by conducting this meta-analysis.
We performed a systematic literature search in PubMed, Embase and the Cochrane Library. The hazard ratio (HR) /Odds Ratio (OR) and its 95% confidence (CI) of survival outcomes and clinicopathological parameters were calculated.
A total of 49 studies (51 cohorts) with 28,929 GC patients were included in the final meta-analysis. The pooled results showed that elevated PLR was significantly associated with poor overall survival (OS) (HR: 1.37, 95% CI: 1.26–1.49, p < 0.001; I2 = 79.90%, Ph < 0.001) and disease-free survival (DFS) (HR 1.52, 95%CI 1.22–1.90, P < 0.001, I2 = 88.6%, Ph< 0.001) of GC patients. Furthermore, patients with elevated PLR had a higher risk of lymph node metastasis (OR = 1.17, 95% CI: 1.02–1.33, p = 0.023), serosal invasion (T3 + T4) (OR = 1.34, 95% CI: 1.10–1.64, p = 0.003) and increased advanced stage (III + IV) (OR = 1.20, 95% CI: 1.06–1.37, p = 0.004).
This meta-analysis demonstrated that elevated PLR was a prognostic factor for poor OS and DFS, and associated with clinicopathological parameters in patients with GC.

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On 04 Jul, 2020
Received 26 Jun, 2020
Received 26 Jun, 2020
On 21 Jun, 2020
On 21 Jun, 2020
Invitations sent on 16 Jun, 2020
On 15 Jun, 2020
On 14 Jun, 2020
On 14 Jun, 2020
Posted 17 Apr, 2020
On 06 Jun, 2020
Received 27 Apr, 2020
Received 27 Apr, 2020
On 16 Apr, 2020
Invitations sent on 15 Apr, 2020
On 15 Apr, 2020
On 14 Apr, 2020
On 13 Apr, 2020
On 13 Apr, 2020
On 11 Apr, 2020
On 04 Jul, 2020
Received 26 Jun, 2020
Received 26 Jun, 2020
On 21 Jun, 2020
On 21 Jun, 2020
Invitations sent on 16 Jun, 2020
On 15 Jun, 2020
On 14 Jun, 2020
On 14 Jun, 2020
Posted 17 Apr, 2020
On 06 Jun, 2020
Received 27 Apr, 2020
Received 27 Apr, 2020
On 16 Apr, 2020
Invitations sent on 15 Apr, 2020
On 15 Apr, 2020
On 14 Apr, 2020
On 13 Apr, 2020
On 13 Apr, 2020
On 11 Apr, 2020
Systemic inflammatory parameters, such as the elevator PLR (platelet-lymphocyte ratio), have been found to be associated with the prognosis in gastric cancer (GC); however, the results remain controversial. So we aimed to evaluate the prognostic role of the PLR in gastric cancer by conducting this meta-analysis.
We performed a systematic literature search in PubMed, Embase and the Cochrane Library. The hazard ratio (HR) /Odds Ratio (OR) and its 95% confidence (CI) of survival outcomes and clinicopathological parameters were calculated.
A total of 49 studies (51 cohorts) with 28,929 GC patients were included in the final meta-analysis. The pooled results showed that elevated PLR was significantly associated with poor overall survival (OS) (HR: 1.37, 95% CI: 1.26–1.49, p < 0.001; I2 = 79.90%, Ph < 0.001) and disease-free survival (DFS) (HR 1.52, 95%CI 1.22–1.90, P < 0.001, I2 = 88.6%, Ph< 0.001) of GC patients. Furthermore, patients with elevated PLR had a higher risk of lymph node metastasis (OR = 1.17, 95% CI: 1.02–1.33, p = 0.023), serosal invasion (T3 + T4) (OR = 1.34, 95% CI: 1.10–1.64, p = 0.003) and increased advanced stage (III + IV) (OR = 1.20, 95% CI: 1.06–1.37, p = 0.004).
This meta-analysis demonstrated that elevated PLR was a prognostic factor for poor OS and DFS, and associated with clinicopathological parameters in patients with GC.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5
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