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  • Research note
  • Open Access

Treatment outcome of anti-angiogenesis through VEGF-pathway in the management of gastric cancer: a systematic review of phase II and III clinical trials

  • 1Email author,
  • 1,
  • 1 and
  • 1, 2
BMC Research Notes201811:21

  • Received: 20 October 2017
  • Accepted: 6 January 2018
  • Published:



Advanced gastric cancer poses a therapeutic challenge worldwide. In randomised clinical trials, anti-VEGF has been reported as an essential agent for the treatment of advanced gastric cancer. This review aims at assessing the treatment outcome of anti-angiogenesis therapy through the VEGF pathway in the management of patients with advanced gastric cancer.


During this review, 38 clinical trials were identified. Of these, 30 clinical trials were excluded, leaving eight trials of phase II and III. Ramucirumab, as a second line treatment of advanced gastric cancer, decreases the risk of disease progression (37–52%) and death (19–22%). Compare ramucirumab and bevacizumab in combination with traditional chemotherapy; ramucirumab has shown to improve progression-free survival and overall survival. Apatinib tyrosine kinase inhibitor combined with traditional chemotherapy has shown to improve overall response rate and progression-free survival with marginal improvements in overall survival. Chemotherapy, in combination with anti-VEGF drugs, in the management of advanced gastric cancer significantly improves the outcome of overall response rate, progression-free survival and overall survival when compared to chemotherapy alone. Therefore, we recommend that anti-VEGF drugs are the drugs of choice in the management of patients with advanced gastric cancer.


  • Gastric cancer
  • Anti-angiogenesis
  • Management
  • Treatment outcome


Gastric cancer represents a significant cancer burden worldwide and is associated with poor prognosis [1]. Globally cancer statistics reported that gastric cancer is the fifth most common cancer and the third most common cancer-related deaths [2]. Surgical resection followed by adjuvant chemotherapy with or without radiotherapy is of paramount importance to achieve cure in patients presents with the early stage of gastric cancer [3]. However, almost two-thirds of patients with gastric cancer diagnosed when the disease is already at an advanced stage and is not manageable by radical surgical treatment [46]. Despite advances in diagnostic techniques, neoadjuvant chemoradiotherapy and surgery, the treatment outcome of gastric cancer remain poor [7]. For this reason, there is a need to develop innovative, effective therapies.

Angiogenesis is a fundamental stage in the growth of cancers and their metastasis [810]. Therefore, the inhibition of angiogenesis has received considerable attention in oncological research, including gastric cancer [813]. Anti-angiogenesis treatment inhibits the capillary growth, causing a state of cancer dormancy. This mechanism of anti-angiogenesis therapy was confirmed after the discovery of VEGF family members for the development of stimulators of new blood vessel formation (VEGF A, B, C, D, E) and the discovery of several VEGF pathway targeting drugs [14, 15]. VEGF is an angiogenic factor produced by tumor cells that stimulate the growth of endothelial cells [16]. It enhances the permeability of blood vessels, reduces endothelial cell apoptosis, activates stromal proteolysis, and promotes the proliferation and migration of endothelial cells [17]. VEGF families bind to vascular endothelial growth factor receptors (e.g., VEGFR-1, VEGFR-2, and VEGFR-3). These are all TK receptors that present in both lymphatic and blood vessels endothelial. The binding of VEGF-A to VEGF receptor-2 triggers the dimerisation and transphosphorylation of the intracellular tyrosine kinase domains, leading in activation of TK enzymes and pathways causing cellular proliferation and endothelial cell survival. Inhibition of these pathways by specific inhibitors may result in inhibition of cell proliferation and endothelial cell survival [18]. Clinical treatment techniques were targeting VEGF pathways comprised of an anti-VEGF monoclonal antibody, tyrosine kinase inhibitors and VEGF receptor monoclonal antibodies [18]. Endostatin is a drug that blocks VEGF-induced migration; hence, preventing metastasis of GC through angiogenesis. This drug was developed in China [19].

Many clinical trials have confirmed VEGF inhibitors as important therapeutic agents in multiple solid tumors including gastric cancer. This review aims to assess the treatment outcome of anti-angiogenesis therapy through VEGF pathways in the management of gastric cancer patients.

Main text


Search strategy

Articles of these clinical trials were identified through a literature search of Pub-Med, MEDLINE and EMBASE. The searches were limited to papers published in the English language. The following strategies were used to retrieve articles, (gastric* OR stomach) AND (cancer OR tumor OR carcinoma) AND (anti-angiogenesis) AND (VEGF) OR (vascular endothelial growth factor) AND (outcome). The literature search started on January 10, 2016, until September 22, 2016. The search was performed independently by reviewers BM and PLC.

Study inclusion and exclusion criteria

Eligibility criteria for inclusion in this review were (i) histopathologically diagnosed gastric cancer, (ii) prospective phase II–III trials, (iii) involving adults patients aged 18 years and older, (iv) studies assessing the effect of anti-VEGF agents on patient’s outcomes in the management of advanced gastric cancer, (v) studies published in English.

Exclusion criteria were: (i) non-clinical trials, (ii) non-English literature, (iii) trials with inadequate details of methodologies and results.

Data extraction and quality assessment

Eligible studies reviewed and retrieved information was; the name of first author, year of publication, number of patients enrolled, treatment scheme in both arms and outcome measures were (ORR, PFS, OS) and related adverse effects. Consensus resolved any disagreement. Quality of methodology used in each study was assessed independently by reviewers BM and PLC using Cochrane Reviewer’s criteria.

Statistical data analysis

In all clinical trials, STATA SE v. 13.1 (STATA_ Corporation, Texas, USA) used for data analysis. Kaplan–Meier method used to calculate median PFS and OS. The HR associated with treatment was estimated using Cox proportional hazards regression. A two-sided alpha of 5% was used to calculate CIs and determine p values. A p value of p < 0.05 was considered significant statistically.


Study selection

38 relevant clinical trials were identified through the literature search. Twelve of studies were excluded due to duplications, leaving 26 full-text articles for further review. 8 studies were excluded because they were not full text. The remaining 18 articles were reassessed, and 10 articles were excluded due to insufficient data. The remaining eight full-text articles were eligible for systematic review (Fig. 1). The title and abstracts of selected articles were reviewed by independent reviewers BM and PLC.
Fig. 1
Fig. 1

Flow diagram of the studies extracted in this review

Patient/study characteristics

During this review, 2309 patients were included in eight phase II and III clinical trials. The median number of patients in each trial was 288 (range 39–328). In this review, all patients had inoperable, advanced gastric cancer and not manageable by local or regional therapy. Agents under investigation targeted the VEGF pathway including anti-VEGF, the anti-VEGFR monoclonal antibody, and anti-VEGFR tyrosine kinase inhibitors (given either alone or in combination with either chemotherapy or placebo). The outcomes measured reported in all the clinical trials included: overall response rate, progression-free survival, overall survival, and adverse effects.

Treatment regimen and outcomes

Anti-VEGF therapies include in phase II, and III trials were:

(a) Anti-VEGF monoclonal antibody
Bevacizumab plus chemotherapy has been reported in several clinical trials to increase the anti malignancy activity in some tumors [2023]. The AVAGAST trial was a phase- III clinical trial that was designed to assess the efficacy of bevacizumab in combination with chemotherapy (capecitabine and cisplatin) in the first-line management of advanced gastric cancer [20]. The results of the AVAGAST trial are shown in Table 1. Therefore in the AVAGAST trial, it was found that adding bevacizumab to chemotherapy could not significantly improve the OS of advanced gastric cancer patients. The AVATAR trial, a phase-III clinical trial that was carried out in China, showed no significant difference between target combined therapy and chemotherapy alone (Table 1). Adverse effects of (Grade C3, C4) for bevacizumab in both arms were similar [24, 25].
Table 1

Phase 111 clinical trials of anti-VEGF monoclonal antibody agents in advanced gastric cancer



AVATAR trial

REGARD trial



Ohtsu et al.

Shen et al.

Fuchs et al.

Wilke et al.

Number of patients




















Treatment regimens


CT + Bev

CT + Bev

Ram + BSC

PTX + Ram


CT + placebo

CT + placebo


PTX + placebo

ORR (%)

 1st-arm (n/%)










 HR (95% CI)

8.1 (0.6–16.6)

7.02 (8.3–22.4)


 p value




TTP/PFS (in months)











 HR (95% CI)

0.80 (0.68–0.93)

0.89 (0.66–1.21)

0.483 (0.376–0.620)

0.635 (0.536–0.752

 p value





OS (in months)











 HR (95% CI)

0.87 (0.73–1.03)

1.11 (0.79–156)

0.77 (0.603–0.998

0.807 (0.678–0.962)

 p value





ORR median overall response rate, TTP median time to progression, PFS median progression-free survival, OS median overall survival, T capecitabine, C cisplatin, Bev bevacizumab, HR hazard ratio, CI confidence interval, Ram ramucirumab, BSC best supportive care, PTX paclitaxel

Ramucirumab is a human monoclonal antibody that binds to VEGFR-2 to block the pathways of VEGF in angiogenesis [26]. The REGARD clinical trial was a phase-III trial that was designed to assess the efficacy and safety of ramucirumab in the management of advanced gastric cancer [27]. The patients in the REGARD trial were randomly assigned to receive the best supportive care plus either ramucirumab or a placebo. The analysis of the outcome of this clinical trial demonstrated the improvements in PFS and OS with no sign of improvement of ORR (Table 1).

The RAINBOW trial is another phase-III trial that was designed to evaluate the efficacy of ramucirumab plus chemotherapy (paclitaxel) in one arm and placebo plus chemotherapy (paclitaxel) on the other arm in patients with advanced gastric cancer or gastro-oesophageal junction adenocarcinomas [28]. The results of the RAINBOW trial are summarised in Table 1.

(b) Anti-VEGF tyrosine kinase inhibitors (TKIs)
Tyrosine kinase inhibitors are a class of drugs that inhibit VEGF receptors in the management of gastric cancers. These include sunitinib, sorafenib, axitinib, apatinib mesylate, and regorafenib [29]. Sunitinib is a drug that inhibits all members of the VEGFR family. Sunitinib has been investigated as a monotherapy or in combination with chemotherapy in phase-II trials. The results of sunitinib as the monotherapy were as follows: 2 patients had partial responses, and 25 patients had stable disease for ≥ 6 weeks [30]. The results of Sunitinib in combination with chemotherapy were as follows. There was no statistical difference in time progression between two groups [i.e., sunitinib alone (3.9 months) versus target combined chemotherapy (2.6 months)] [30]. The RR was 41.4% versus 14.3% in target combined chemotherapy and sunitinib respectively. Adverse events reported were grade 3, thrombocytopenia in 34.6% and neutropenia in 29.4% of patients. Phase-II clinical trial was designed to evaluate the efficacy and safety of sorafenib in combination with chemotherapy (docetaxel, and cisplatin) in the management of patients with metastatic gastric cancer or gastro-oesophageal adenocarcinomas, in this trial result showed that sorafenib plus chemotherapy was safe but not effective compared to chemotherapy alone [31, 32] (Table 2).
Table 2

Phase 11/III clinical trials of anti-VEGF tyrosine kinase inhibitors agents in advanced gastric cancer


Number of patients


ORR (%)

PFS (months) [HR (95% CI), p value]

OS (months/days) [HR (95% CI), p value]

















Apatinib (850 mg)




 Apatinib group




HR 0.44, 95% CI 0.33–0.61

p < 0.0001

195 days

HR 0.71, 95% CI 0.54–0.94

p < 0.06

 Placebo group




140 days





 Treb (10 mg)




HR 0.98

95% CI 0.67–1.43

p = 0.92



 Treb (3 mg)






 Ch + placebo










 Rego group






25 weeks


 Placebo group





p = 0.0001

19.4 weeks

p = 0.11

ORR median overall response rate, TTP median time to progression, PFS median progression-free survival, OS median overall survival, HR hazard ratio, CI confidence interval, Ch chemotherapy, Treb Trebananib, NR not reported

Telatinib is an inhibitor of VEGFR-2 and VEGFR-3, in phase-II clinical trial telatinib plus chemotherapy has shown a good toxicity profile in the treatment of gastric carcinomas [33]. In phase-1 clinical trial of apatinib, a TKI blocking VEGFR-2 was evaluated and showed anticancer activities among Chinese patients with metastatic gastric cancer [3436]. In phase-II trial, 144 patients were involved and assigned to placebo, apatinib 850 mg and apatinib 425 mg. In this trial, apatinib was recommended in the management of gastric cancer. A promising result of apatinib was found in phase-III clinical trial involving 267 patients assigned to two groups (apatinib group and placebo group). The results of this trial are shown in Table 2 [37].

Regorafenib drug was tested in phase-II clinical trial in patients with gastric cancer after they received 1st and 2nd line therapy [38]. Table 2 summarises the results of Regorafenib.


In this systematic review, 2309 patients were involved in eight clinical trials (phase II and III) to assess the treatment outcome of ant-angiogenesis therapy through VEGF in the management of advanced inoperable GC. The results of AVAGAST and AVATAR trials regarding PFS, OS, RR, and toxicities indicate that the effectiveness of bevacizumab in the management of gastric cancer didn’t achieve positive results [20, 39]. RAINBOW and REGARD clinical trials demonstrated that ramucirumab was given alone or in combination with chemotherapy significantly reduced the risk of disease progression (37–52%) and death (19–22%) of gastric cancer [27, 28]. Results of these trials made ramucirumab an effective anti-VEGF drug for local advanced gastric cancer or metastatic gastric cancer.

Bevacizumab is a drug that inhibits VEGF-A only, while ramucirumab inhibits all VEGFs thus inhibiting receptors activation of downstream VEGF signaling pathways resulting in reduced tumor neovascularisation and growth [27]. In the REGARD trial, ramucirumab demonstrated impressive results; hence the Food and Drug Administration approved ramucirumab in the management of advanced and metastatic gastric cancer [27]. Sorafenib, sunitinib and apatinib are TKIs that act by targeting VEGFR pathway. In phase III clinical trial, apatinib (TKI) has shown to improve PFS, and there is a marginal increase in overall survival in patients with chemorefractory GC [37]. A study involving sunitinib as a second-line treatment for advanced gastric cancer results showed insufficient clinical values, while a similar study of sunitinib with conventional chemotherapy revealed severe toxicities [30, 34]. A phase II studies involved sorafenib in combination with chemotherapies in the management of patients with advanced and metastatic gastric cancer, results showed an encouraging efficacy profile with low toxicity, while other study showed very low efficacy profile and the drug was intolerable [30, 31, 38]. Most phase-II randomised clinical trials involving TKI drugs plus chemotherapy present with controversial results [35]. In the Apatinib study, PFS and OS were shown to improve in patients who previously have received two or more chemotherapy regime. Therefore, apatinib remains a standard treatment in patients with disease recurrence after chemotherapy in patients with advanced and metastatic gastric cancer [40].


This systematic review demonstrated that target combined chemotherapy in the management of advanced gastric cancer showed a significant improvement in OS and ORR over chemotherapy alone. Chemotherapy in combination with anti-VEGFR drugs (e.g., ramucirumab and apatinib) in the management of advanced gastric cancer significantly improves outcome in terms of ORR, PFS, and OS. We recommend that anti-VEGFR pathway drugs be used in the management of patients with advanced gastric cancer.

Limitations of the study

  1. 1.

    The inclusion of only prospective phase II–III clinical trials published in English may have excluded some informative studies of other phases or published in a non-English language.

  2. 2.

    A high heterogeneity level between a limited number of studies and multiple drugs is involved.






confidence interval


gastric cancer


gastro-esophageal carcinoma


tyrosine kinase inhibitors


hazard ratio


odds ratio


overall response rate


overall survival


progression-free survival


randomized clinical trials


tyrosine kinase


vascular endothelial growth factor receptor


vascular endothelial growth factor


excerpta medical database


Medical Literature Analysis and Retrieval System Online


Avastin in gastric cancer trial


Authors’ contributions

BM was involved in the literature search, and writing, editing, and submitting the manuscript. XY, XL, and PLC participated in the literature search, writing of the manuscript, and editing the article. All authors read and approved the final manuscript.


The authors thank all those who participated in the preparation of this review. Special thanks go to Mr. Yanga Machimu for his technical help in the literature search.

Competing interests

The authors declare that they have no competing interests.

Availability of data and materials

Data collected and analyzed during this study are included in this review and are available from the corresponding author on reasonable request.

Consent for publication

Not applicable.

Ethics approval and consent to participate

Not applicable.


There was no funding available for this systematic review. Authors met all operational costs.

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Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver ( applies to the data made available in this article, unless otherwise stated.

Authors’ Affiliations

Department of Oncology, Huazhong University of Science and Technology, Tongji Medical College, Tongji Hospital, Wuhan, Hubei, China
Department of Surgery, Bugando Medical Centre, Mwanza, Tanzania


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