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Survivin protein expression is involved in the progression of non-small cell lung cancer in Asians: a meta-analysis

Abstract

Background

Surviving expression might serve as a prognostic biomarker predicting the clinical outcome of non-small cell lung cancer (NSCLC). The study was conducted to explore the potential correlation of survivin protein expression with NSCLC and its clinicopathologic characteristics.

Methods

PubMed, Medline, Cochrane Library, CNKI and Wanfang database were searched through January 2016 with a set of inclusion and exclusion criteria. Data was extracted from these articles and all statistical analysis was conducted by using Stata 12.0.

Results

A total of 28 literatures (14 studies in Chinese and 14 studies in English) were enrolled in this meta-analysis, including 3206 NSCLC patients and 816 normal controls. The result of meta-analysis demonstrated a significant difference of survivin positive expression between NSCLC patients and normal controls (RR = 7.16, 95 % CI = 4.63-11.07, P < 0.001). To investigate the relationship of survivin expression and clinicopathologic characteristics, we performed a meta-analysis in NSCLC patients. Our results indicates survivin expression was associated with histological differentiation, tumor-node-metastasis (TNM) stage and lymph node metastasis (LNM) (RR = 0.80, 95 % CI = 0.73-0.87, P < 0.001; RR = 0.75, 95 % CI = 0.67-0.84, P < 0.001; RR = 1.14, 95 % CI = 1.01-1.29, P = 0.035, respectively), but not pathological type and tumor size. (RR = 1.00, 95 % CI = 0.93-1.07, P = 0.983; RR = 0.95, 95 % CI = 0.86-1.05, P = 0.336, respectively).

Conclusion

Higher expression of survivin in NSCLC patients was found when compared to normal controls. Survivin expression was associated with the clinicopathologic characteristics of NSCLC and may serves as an important biomarker for NSCLC progression.

Peer Review reports

Background

Non-small cell lung cancer (NSCLC) remains one of the most fatal health problems in terms of morbidity and mortality and is the leading cause of cancer-related mortalities worldwide [1]. Histologically, NSCLC is consisted of three different subtypes: squamous cell carcinoma, adenocarcinoma, and large cell carcinoma, accounting for approximately 80 % ~ 85 % of lung cancer [2]. NSCLC is highly resistant to the existing cancer therapeutics and the great majority of NSCLC patients are diagnosed at advanced tumor stage. Although the recent advances in clinical and experimental oncology the survival of advanced NSCLC are still poor, with a 5-year survival rate of about 15 % [3, 4].

It is generally accepted that abnormal inhibition of apoptosis during homeostasis plays an important role in cancer development, progression and resistance to therapy [5]. Survivin, the common member of the inhibitor of the apoptosis protein (IAP) family, is a protein encoded by the BIRC5 gene in human with dual role in promoting cell proliferation and preventing apoptosis [6]. Previous studies revealed that survivin expression was found in precancerous lesions as well as in early stages of cancer in the skin, uterine cervix, colon, and oral mucosa [7, 8]. It was reported that survivin expression might serve as a prognostic biomarker predicting the clinical outcome of NSCLC, and might be associated with the clinicopathologic characteristics of NSCLC [5]. Perobska I et al. showed that lymph node metastases, tumor node metastasis (TNM) stage and tumor size had a higher incidence of survivin expression [9]. In order to clarify the relation between survivin expression and NSCLC, we conducted this meta-analysis.

Methods

Publication search

Online electronic databases (PubMed, Medline, Cochrane Library, CNKI and Wanfang) were searched with the key terms: (survivin or survivin protein) and (non-small cell lung cancer or NSCLC or non-small-cell lung carcinoma) (update to January 2016). We also checked out the reference lists of all retrieved studies and relevant reviews manually for important cross-references.

Inclusion and exclusion criteria

Published studies were selected if they met all of the following criteria: (1) The study must be conducted in NSCLC patients; (2) The study must evaluate the Survivin protein expression; (3) Sufficient data, especially survivin positive expression in NSCLC patients and normal controls, have been provided to calculate risk ratios (RR) and 95 % confidence interval (95 % CI); (4) Number of NSCLC cases in enrolled studies should be more than 60; (5) The study must be published in a peer-reviewed journal; (6) The study must be independent from other studies. The exclusion criteria were as follows: (1) The studies did not conform to the inclusion criteria; (2) Reviews, case reports, editorials, guidelines and comments were excluded; (3) In case of duplicated publications or studies with overlapping data, the study with largest data was selected.

Data extraction and qualitative assessment

The following data were collected from all the included studies: first author, publication year, country, ethnicity of participants, language, and numbers of participants, age, gender, subcellular localization and positive expression of survivin. Data from the finally selected studies were extracted based on a standard protocol. Potential discrepancy was resolved by discussions or by consulting the original report. Two reviewers independently assessed the methodological quality of the included trials using the Newcastle-Ottawa Scale (NOS) criteria to ensure consistency in reviewing and reporting results. The studies were scored based on three aspects: (1) selection of study group; (2) comparability of study groups; (3) ascertainment of the outcome of interest. A study was considered as low, moderate or high quality with the score 0 ~ 3, 4 ~ 6 and 7 ~ 9, respectively. Disagreement was settled by discussion, or a third investigator was consulted.

Statistical analysis

Statistical test was conducted with the STATA statistical software (Version 12.0, Stata Corporation, College Station, TX, USA). To assess the correlation between survivin protein expression and the clinicopathologic characteristics, RR and its 95 % CI were calculated using random effects model or fixed-effects model. The statistical significance of pooled RRs was estimated by the application of Z test. We used Cochran’s Q-statistic (P < 0.05 was considered significant) and I 2 test to assess heterogeneity among studies. Random effects model was applied for the evidence of significant heterogeneity (P < 0.05 or I 2 test exhibited > 50 %); otherwise, fixed-effects model was used. Univariate and multivariate meta-regression analyses were used to evaluate the potential sources of heterogeneity. Further identification was performed by using Monte Carlo method. Additionally, we applied a sensitivity analysis to evaluate whether one single study had the weight to impact on the overall estimate. Further, the effect of publication bias was examined by Egger’s linear regression test (P < 0.05 was considered significant).

Results

Literature searching results and baseline characteristics of included studies

Four hundred and eighty-seven articles were initially identified through database searches. Twenty-eight studies remained after excluding duplicates (n = 42), letters, reviews, meta-analyses (n = 46) and irrelevant topic (n = 273), non-core journal in Chinese (n = 36), insufficient information in studies (n = 35) and number of NSCLC cases less than 60 (n = 27), 28 trials were finally selected for this meta-analysis (Fig. 1) [5, 1036]. The enrolled studies published between 2005 and 2015 included 3206 NSCLC patients and 816 normal controls, with 2252 males and 954 females. For the pathological type, 1010 patients with squamous cell carcinoma (SCC), 806 with adenocarcinoma (AC). With respect to clinicopathologic features, 1198 patients with well/moderate differentiation, 788 with poor differentiation; 1421 at I/II stage and 1009 at III/IV stage (TNM stage); 1256 patients with lymphatic metastasis and 1185 patients without lymphatic metastasis. All included studies scored 7 in terms of NOS scores. The baseline characteristics of included studies were showed in Table 1.

Fig. 1
figure1

PRISMA Flow chart of study selection procedure

Table 1 Baseline characteristics of included studies

The comparison between NSCLC patients and normal controls on survivin protein expression

A total of 19 studies provided data of survivin expression in NSCLC patients and normal controls (1537 NSCLC patients and 816 normal controls). Heterogeneity test revealed the existence of heterogeneity in those 19 trials, thus a random-effect model was used (I 2 = 58.1 %, P < 0.001). Meta-analysis result revealed that survivin expression in NSCLC patients was significantly higher when compared with normal controls (RR = 7.16, 95 % CI = 4.63-11.07, P < 0.001) (Fig. 2).

Fig. 2
figure2

Forest plots for the comparisons of survivin expression between NSCLC patients and normal controls

The analysis of survivin expression and clinicopathologic characteristics of NSCLC

For the meta-analysis according to pathological types, we included 22 studies, involving 1010 SCC patients and 806 AC patients. Heterogeneity test revealed the lack of heterogeneity in these studies and a fixed-effect model was applied (I 2 = 7 %, P = 0.367). No significantly different survivin expression was found between squamous cell carcinoma (SCC) and adenocarcinoma (AC) (RR = 1.00, 95 % CI = 0.93-1.07, P = 0.983) (Fig. 3). A total of 21 studies investigated histological differentiation of NSCLC patients and moderate heterogeneity existed in these studies (I 2 = 45.4 %, P = 0.013). Results from random-effect model suggested that survivin expression was significantly lower in NSCLC patients with well/moderate differentiation than that in the patients with poor differentiation (RR = 0.80, 95 % CI = 0.73-0.87, P < 0.001) (Fig. 4). 26 studies provided survivin expression level at different TNM stages. Heterogeneity test showed the presence of heterogeneity in these studies (I 2 = 72.7 %, P < 0.001). Meta-analysis results revealed that NSCLC patients at TNM III/IV stage had a significantly higher survivin expression than the patients at TNM I/II stage (RR = 0.75, 95 % CI = 0.67-0.84, P < 0.001) (Fig. 5). A total of 25 studies indicated the status of lymphatic metastasis. Meta-analysis suggested that survivin expression in NSCLC patients with lymphatic metastasis was significantly higher than that in the patients without lymphatic metastasis (RR = 1.14, 95 % CI = 1.01-1.29, P = 0.035) (Fig. 6). 11 studies showed the survivin expression in the patient with different tumor size. No heterogeneity was found in these studies (I 2 = 18.1 %, P = 0.272). Meta-analysis revealed that survivin expression was not associated with tumor size (RR = 0.95, 95 % CI = 0.86-1.05, P = 0.336) (Fig. 7).

Fig. 3
figure3

Forest plots for the comparisons of survivin expression between SCC patients and AC patients

Fig. 4
figure4

Forest plots for the comparisons of survivin expression between well/moderated differentiated patients and poor differentiated patient

Fig. 5
figure5

Forest plots for the comparisons of survivin expression between patients at TNM I/II stage and TNM III/IV stage

Fig. 6
figure6

Forest plots for the comparisons of survivin expression between patients with LNM and without LNM

Fig. 7
figure7

Forest plots for the correlation of survivin expression and tumor size

We also performed subgroup analysis according to the ethnicity. And the results showed survivin expression was associated with respect to histological differentiation, TNM stage and lymph node metastasis in Asian populations but not in Caucasian populations. (Table 2) For Caucasians, only the contrast of NSCLC versus and normal control reach the statistical significance. According to the definition of positive expression, the studies were divided in to 3 subgroups. (1 Survivin expressed in cytoplasm only, 2 Survivin expressed in cytoplasm or nucleus, 3 Survivin expressed in both cytoplasm and nucleus) Subgroup analysis found survivin expression was associated with histological differentiation, TNM stage and lymph node metastasis in subgroup 1 and subgroup 2, but not in subgroup 3. (Table 3)

Table 2 Summary of subgroup analysis by ethnicity
Table 3 Summary of subgroup analysis by localization of survivin expression

Sensitivity analysis and publication bias

The sensitivity analysis demonstrated that a single study had no significant effect on the pooled RRs. Egger’s test based on the 19 literatures which provided the comparison between NSCLC patients and normal controls revealed the presence of publication bias (P = 0.001). After the application of fill and trim method, statistical significance still existed on the survivin expression between NSCLC patients and normal controls (P < 0.001), suggesting publication bias has no significant effect on the final results. For those studies investigated pathological types (n = 22), histological differentiation (n = 21), TNM stage (n = 26), lymphatic metastasis (n = 25) and tumor size (n = 11), no publication biases were found by Egger’s test.

Meta-regression analysis

Univariate meta-regression analysis revealed that country and ethnicity may be the potential sources for most of heterogeneity (P > 0.05). Multivariate meta-regression analysis further confirmed this finding (Table 4).

Table 4 Meta-regression analyseis of potential source of heterogeneity

Discussion

The tumorigenesis of NSCLC is a complex process with the feature of imbalance in cell apoptosis and proliferation. Aberrant proliferation of tumor cells may emerge as cell apoptosis is inhibited, which eventually provided supports for tumorigenesis, development, invasion and metastasis [37]. Survivin is one of the most important inhibitor of IAP family, which is normally expressed in embryonic and fetal tissues but is almost absent in terminally differentiated cells [6, 38]. Its overexpression has been reported in many malignancies including NSCLC. [39] Several studies have reported survivin overexpression was involved in the development of NSCLC [7, 8].

The result of meta-analysis showed a significant difference in survivin expression between NSCLC patients and normal controls. To investigate the correlation between survivin expression and clinicopathologic characteristics, we performed several meta-analysis in NSCLC patients classified by clinicopathologic parameters. Our results suggested survivin expression was associated to histological differentiation, tumor-node-metastasis (TNM) stage and lymph node metastasis (LNM). Roles of survivin in the progression of NSCLC have been investigated previously. Babaei et al. reported survivin is associated with high grade malignancies. [40] Significant overexpression of survivin was observed in NSCLC patients at late stage. [41] A strong heterogeneity was detected among individual studies. Meta-regression indicated ethnicity was the primary source of heterogeneity. In the subgroup analysis classified by ethnicity, the significant associations were still present in Asians but not in Caucasians. One possible reason was that only few studies were conducted in Caucasians and no firm conclusions can be draw from a small sample set. Further research with large sample size is needed to define the impact of survivin expression in Caucasians.

Survivin has been shown to localize in mitochondria, cytoplasm and nucleus. And the functional dynamics of survivin are dependent on its subcellular localization. [42] Localization of survivin to the nucleus and cytoplasm confers its role in mitosis regulation and apoptosis inhibition. [43] In nucleus, survivin is involved in the chromosomal packaging complex and controls mitosis in many aspects including regulations of the mitotic spindle checkpoint and mitotic progression. [44] As an inhibitor in IAP family, survivin can directly inhibit caspase-3 and caspase-7 activity to prevent apoptosis [5]. In the studies included in our meta-analysis, most studies reported cytosol survivin expression only. Several studies defined positive expression as survivin expression in cytoplasm or nucleus. Only in 2 studies survivin expression in both cytoplasm and nucleus was considered as positive expression. We performed subgroup analysis according to the subcellular localization of survivin and only found the 2 studies with survivin expression in both cytoplasm and nucleus gave different results with other subgroups. Further research is necessary to determine with precision whether there is a correlation between subcellular localization of survivin expression and progression of NSCLC.

There were several limitations in our present meta-analysis. First, for the insufficiency of data, we did not analyze whether survivin expression is correlated the prognosis of NSCLC. Secondly, although our meta-analysis included 28 studies, only 4 studies were performed in Caucasians. Thus, no firm conclusions can be draw in Caucasians and the difference between Asians and Caucasians is uncertain.

Conclusions

In conclusion, although our meta-analysis has some shortcomings, it still provides evidence that survivin expression was associated with the clinicopathologic characteristics of NSCLC in Asians, suggesting that survivin protein can serves as an important biomarker for the progression of NSCLC. However, further investigations with more integral data are needed to determine the correlation of survivin expression and the progression of NSCLC in Caucasians.

Abbreviations

NSCLC:

Non-small cell lung cancer

TNM:

Tumor-node-metastasis

LNM:

Lymph node metastasis

NOS:

Newcastle-Ottawa scale

RR:

Risk ratios

CI:

Confidence interval

SCC:

Squamous cell carcinoma

AC:

Adenocarcinoma

IAP:

Inhibitor of the apoptosis protein

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Acknowledgements

We appreciate all of the colleague in the team of Department of Thoracic Surgery, which provided advice for preparing the manuscript.

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Author information

Correspondence to Liang Duan or Qingjun You.

Additional information

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

Authors LD and QJY conceived and designed the experiments. XFH and YXJ performed the experiments. RJL analyzed the data. LD, RJL and QJY contributed reagents/materials/analysis tools LD and QJY contributed to the writing of the manuscript. All authors contributed to and have approved the final manuscript.

Liang Duan and Xuefei Hu are first co-author.

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Duan, L., Hu, X., Jin, Y. et al. Survivin protein expression is involved in the progression of non-small cell lung cancer in Asians: a meta-analysis. BMC Cancer 16, 276 (2016). https://doi.org/10.1186/s12885-016-2304-3

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Keywords

  • Survivin
  • Non-small cell lung cancer
  • Pathological characteristics
  • Meta-Analysis