Published online Apr 28, 2023. doi: 10.3748/wjg.v29.i16.2452
Peer-review started: December 26, 2022
First decision: March 8, 2023
Revised: March 19, 2023
Accepted: April 7, 2023
Article in press: April 7, 2023
Published online: April 28, 2023
Gastric cancer (GC) is defined as the primary epithelial malignancy derived from the stomach, and it is a complicated and heterogeneous disease with multiple risk factors. Despite its overall declining trend of incidence and mortality in various countries over the past few decades, GC remains the fifth most common malignancy and the fourth leading cause of cancer-related death globally. Although the global burden of GC has shown a significant downward trend, it remains severe in certain areas, such as Asia. GC ranks third in incidence and mortality among all cancer types in China, and it accounts for nearly 44.0% and 48.6% of new GC cases and GC-related deaths in the world, respectively. The regional differences in GC incidence and mortality are obvious, and annual new cases and deaths are increasing rapidly in some developing regions. Therefore, early preventive and screening strategies for GC are urgently needed. The clinical efficacies of conventional treatments for GC are limited, and the developing understanding of GC pathogenesis has increased the demand for new therapeutic regimens, including immune checkpoint inhibitors, cell immunotherapy and cancer vaccines. The present review describes the epidemiology of GC worldwide, especially in China, summarizes its risk and prognostic factors, and focuses on novel immunotherapies to develop therapeutic strategies for the management of GC patients.
Core Tip: As a malignant disease with decreasing trends in incidence and mortality, gastric cancer (GC) remains a public health issue worldwide. Various risk factors have been suggested, and the prognosis of GC is related to various factors, such as tumor location, lymph node metastasis, gene polymorphisms and therapeutic strategies. Therefore, novel treatments have been proposed, and immunotherapy has attracted more attention. The present review discusses the epidemiology, risk and prognostic factors of GC with a focus on immunotherapy to better inform the management of GC patients.
- Citation: Yang WJ, Zhao HP, Yu Y, Wang JH, Guo L, Liu JY, Pu J, Lv J. Updates on global epidemiology, risk and prognostic factors of gastric cancer. World J Gastroenterol 2023; 29(16): 2452-2468
- URL: https://www.wjgnet.com/1007-9327/full/v29/i16/2452.htm
- DOI: https://dx.doi.org/10.3748/wjg.v29.i16.2452
Despite its global declines in incidence and mortality over the past several decades, gastric cancer (GC) remains responsible for 1.089 million new cancer cases and 0.769 million deaths in 2020 worldwide, which makes it the fifth-most common malignancy and the fourth leading cause of cancer-related deaths, according to Global Cancer Statistics (GLOBOCAN) 2020[1]. The global age-standardized incidence and mortality rates for GC were 11.1/100000 and 7.7/100000 in 2020, with wide geographical variations[2]. These data highlight that GC remains a major global health challenge. As a primary epithelial malignancy derived from the stomach, the initiation of GC is a multistage process and is generally associated with various risk factors[3], and some elements are related to its prognosis and survival[4,5]. Thanks to advances in preventative, screening and therapeutic strategies, the incidence and mortality of GC has been decreasing gradually worldwide. However, certain challenges still exist in the management of GC, such as the clinical applications of surgical treatment and chemotherapy. Recent immunotherapy for GC has drawn much attention, and it improved the current therapeutic situation. The present review describes the epidemiology of GC in different regions in the world, especially in China, summarizes its risk and prognostic factors, and focuses on new immunotherapies to develop therapeutic strategies for the management of GC patients.
The GLOBOCAN 2020 database (https://gco.iarc.fr/)[1] estimated that there were 1089103 newly diagnosed GC cases in 185 countries, with GC ranking fifth in incidence among all cancer types globally (Figure 1A). According to the anatomical locations, GC is classified as cardia GC and noncardia GC with different epidemiological profiles[1], and noncardia GC is the most common subtype[6]. There is a significant difference in GC incidence in sex distribution, and the age-standardized incidence rate (ASIR) is 15.8/100000 in males and 7.0/100000 in females, which indicates that GC incidence is approximately 2-fold higher in males than females[1]. GC incidence ranked fourth in males and seventh in females among all cancer types[1] (Figure 1A). Geographic variations in the ASIR in GC are up to 1- to 4-fold worldwide[7]. The ASIR is highest in Asia (14.3/100000), followed by Latin America and the Caribbean, Europe and Oceania, and it is lowest in Africa and North America[7] (Figure 2A). Most GC cases are diagnosed in countries with a high and very high human development index (HDI), such as eastern and southeastern Asian countries, central and eastern European and South American countries, and the ASIRs in these countries were higher than countries with a medium and low HDI[2] (Figure 2B). The five countries with the highest ASIRs in Asia were Mongolia (32.5/100000), Japan (31.6/100000), Republic of Korea (27.9/100000), Tajikistan (23.4/100000) and China (20.6/100000) (Figure 3A), which indicated that greater than 69% of the total GC cases in 2020 occurred in eastern and south-central Asia. In addition, Figure 3B and C show the detailed information about the male and female ASIRs in Asia.
GC is the fourth most common cause of mortality among all cancer types, followed by lung, colorectal and liver cancers[1] (Figure 1B). A total of 768793 deaths were estimated to be related to GC, with an overall mortality of 7.7/100000 globally, and sex differences exist with males being twice as likely as females to exhibit the disease (Figure 1B)[1]. The age-standardized mortality rate (ASMR) of GC was highest in Asia (10.0/100000) (Figure 2A). Countries with a very high HDI have higher mortality rates, and countries with a medium and low HDI have lower mortality rates, which is consistent with GC incidence (Figure 2B). The five Asian countries with the highest ASMRs were Mongolia (24.6/100000), Tajikistan (19.7/100000), China (15.9/100000), Bhutan (15.9/100000) and Kyrgyzstan (15.7/100000) (Figure 3D), and the male and female ASMRs in Asia are shown in Figure 3E and F, respectively. Mongolia has the highest incidence and mortality rates, primarily due to the lack of endoscopy and professional endoscopists[8].
The overall GC incidence and mortality rates have steadily declined in most countries during the past several decades, with evident decreases in males and females[1,9-13], as preventative, screening and therapeutic programs have been implemented worldwide[14-16]. For example, the ASIR of GC in Korea decreased significantly from 2011 (ASIR 43.0) to 2019 (ASIR 29.6)[17]. Similar to most other cancers, GC is generally rare in adults aged < 50 years, and its incidence increases with aging[9,10]. However, GC incidence has presented an increasing trend in younger generations (below age 50 years) in high- and low-incidence areas, such as the United States and the United Kingdom, compared to older individuals who exhibited a decreasing trend in GC incidence[9,10,18]. One United States study reported a more pronounced increase in incidence in younger females than males and predicted that the overall incidence may no longer be decreasing, and the GC incidence in females may exceed males if this pattern continues[18]. The 5-year overall survival (OS) rate shows that GC survival has improved due to advances in diagnostic and therapeutic strategies, especially with early detection from national screening programs using endoscopic and/or radiographic methods[9,19]. For example, one study found that the 5-year survival rate of GC in Korea increased from 55.7% in 1999-2005 to 77% in 2013-2019[17], which is consistent with the previous cancer statistics in Korea in 2015[20]. However, GC maintains a high case fatality rate, and it is a main contributor to the global burden[21].
GC is also one of the major malignances in China. The ASIR and ASMR of GC were higher in 2012 (ASIR 22.06/100000, ASMR 15.16/100000) than 2016 (ASIR 17.59/100000, ASMR 12.30/100000), with a decreasing trend from 2012 to 2016 and decreasing trends in males and females[22-26] (Figure 4). The National Cancer Center of China reported 396500 new GC cases and 288500 GC-leading deaths in China in 2016[26], and the ASIR and ASMR of GC ranked fifth (17.59/100000) and third (12.30/100000) among all cancer types, respectively[26,27]. The number of new GC cases in males was nearly 276300 (ASIR 25.14/100000), and GC-related deaths (200200, ASMR 17.77/100000) accounted for approximately 13% of all male cancer-related deaths. The number of new GC cases in females was approximately 120200 (ASIR 10.31/100000), and GC-related deaths (88400, ASMR 7.13/100000) accounted for approximately 10% of all female cancer-related deaths[26]. GLOBOCAN 2020 indicated 479000 new GC cases and 374000 GC-related deaths in China in 2020, which ranked third in incidence and mortality among all cancer types[28] and accounted for 44.0% and 48.6% of new GC cases and GC-related deaths worldwide, respectively[1]. Current data in China (https://gco.iarc.fr/) showed that the ASIR and ASMR of GC were greater than 2-fold in males (ASIR 29.5/100000, ASMR 22.8/100000) than females (ASIR 12.3/100000, ASMR 9.5/100000) in 2022, and more GC cases and deaths occurred in patients over 60 years. Notably, geographic variations also exist in different areas of China. Specifically, the ASIRs and ASMRs of GC in urban areas were higher than rural areas[26]. The ASIR and ASMR were highest in northwestern China (ASIR 25.8/100000, ASMR 18.1/100000), followed by eastern (ASIR 21.9/100000, ASMR 14.8/100000) and central (ASIR 18.7/100000, ASMR 13.8/100000) areas of China, and southern China had the lowest ASIR of 9.2/100000 and ASMR of 6.4/100000[26].
Because the early symptoms of GC are insidious, most GC patients are metastatic in the advanced stage at the time of diagnosis[6]. The proportion of GC patients diagnosed in the early stage was lower than advanced GC patients in China in the past[28]. However, the survival time is closely related to the stage at diagnosis for GC patients[19]. Thereafter, China proposed a series of guidelines aimed at improving GC screening, early detection and therapeutic strategies based on the popularity of gastrointestinal endoscopy, and the proportion of early GCs increased in recent years[28,29]. The 5-year OS rate of GC increased from 27.4% in 2003-2005 to 35.1% in 2012-2015 with an ascending trend in China[29], but it is significantly lower than Japan (81.0%) in 2004-2007[19] and South Korea (75.4%) in 2011-2015[20], which may be related to the different preventive, early screening, diagnostic and therapeutic strategies in individual countries[1].
The pathogenesis of GC is complicated, and more attention should be given to individuals with higher GC risks for surveillance. Various factors may synthetically affect GC occurrence and development (Figure 5). Some risk factors are nonmodifiable, such as age, sex, race/ethnicity and genetics[6,28,30,31], and other controllable risk factors may include Helicobacter pylori (H. pylori) infection, gastrointestinal microbiota, obesity, unhealthy dietary habits and lifestyle, tobacco and alcohol consumption, and chemical, radiation or virus exposure[6,16,28,32-34]. Several relatively rare risk factors may also participate in GC pathogenesis, such as gastroesophageal reflux disease, gastric ulcer or previous gastric surgery[30].
One study reported that 1.8% of GC cases occurred in individuals younger than 34 years, 38.6% occurred in adults between 35 and 64 years old, and 59.6% occurred in elderly individuals over 65 years from 2015 to 2019[35], with a median age at diagnosis of 68 years, which indicate that GC risk increases with aging. Sex differences exist in GC incidence, which is almost twofold higher in males than females[1,35]. These data suggest the protective effect of sex steroid hormones in GC pathogenesis[36]. Males tend to have higher risks of H. pylori infection than females, which may also lead to sex differences[37,38]. Approximately 10% of GC cases exhibited familial aggregation, which indicates that a family history of GC may be an independent risk factor[39,40]. A total of 1%-3% of GC patients may have germline mutations, and the underlying molecular mechanisms have not been fully clarified[41].
Chronic H. pylori infection is the major confirmed cause of GC, and it may be related to approximately 90% of noncardia GC cases[10,42-44]. H. pylori is a Gram-negative pathogenic bacterium and an indigenous member of the gastric microbiota[18,45]. The prevalence of H. pylori infection in adults exceeds 50% of the human population with regional variations globally[1,45,46]. H. pylori infection is easily acquired during childhood[47], and it is generally carried asymptomatically for a lifetime. Since 1994, H. pylori has been classified as a class I carcinogen by the World Health Organization. The long-term colonization of H. pylori in the gastric mucosa contributes to the development of various gastric diseases, such as persistent inflammation, chronic gastritis, gastric mucosal atrophy and intestinal metaplasia, with its different genes encoding virulence factors[45,48]. Chronic H. pylori infection also induces epigenetic and genetic changes in gastric epithelial cells, which suggests the genetic instability of these cells[48]. Therefore, H. pylori infection is etiologically related to GC, and the duration also predisposes individuals toward GC later in life[48]. Because H. pylori infection is closely related to noncardia GC, its eradication significantly decreased the incidence of noncardia GC[48]. However, H. pylori infection is only necessary, but not sufficient, in the pathogenesis of GC[48]. Although controversial[18], H. pylori screening and eradication has been proposed as a preventive strategy for GC[48]. Data from healthy asymptomatic infected Asians showed that eradicating H. pylori reduced GC incidence[49], and population-based screening and eradication of H. pylori infection was cost-effective[50]. The efficacy of eradicating H. pylori to prevent GC also depends on other risk factors, such as the time of H. pylori eradication, intragastric acidity, resistance to antimicrobial agents and the compliance of infected patients[48,51,52]. In contrast, a similar screening strategy may not be economical and is generally unwarranted in some countries with low GC incidences[2]. Anderson et al[18] once indicated that population-based H. pylori eradication in the United States may raise certain unanswered questions about safety, efficacy, unanticipated consequences and failure to reduce the GC burden. Less than 5% of H. pylori-infected individuals may develop GC due to the genetics of H. pylori and the host, duration of H. pylori infection and certain environmental factors[1,53]. The efficacy of H. pylori eradication and its cost-effectiveness should be further investigated in different geographic regions[48].
With the progression of molecular biological technologies, such as next-generation sequencing, a series of studies examined the correlations between GC and gastric microbiota other than H. pylori[54,55]. Ferreira et al[56] performed 16S rRNA gene sequencing analysis of gastric microbiota for 54 GC patients and 81 gastritis controls, and found that the gastric microbiota of GC had reduced microbial diversities, reduced abundance of H. pylori, and the increment of other microbial genera that were similar to intestinal microbiota; besides, the nitrosating functions and genotoxic potential were also increased. He et al[57] investigated the characteristics of the intestinal microbiota in fecal samples from GC patients and healthy individuals using 16S rRNA gene sequencing technology, and showed that the relative abundances of Faecalibacterium, Bifidobacterium, Subdoligranulum, Enterococcus, Streptococcus and Bacteroides were closely associated with GC risk and occurrence. Aziz et al[58] found four types of microbial proteins in serum and tissue biopsy specimens of GC patients, including Acinetobacter baumannii, Escherichia coli, Fusobacterium nucleatum and Bacteroides fragilis, as well as H. pylori. Overall, microbiota-related GC studies indicated an alteration of the gastric microbiota during gastric carcinogenesis, which was distinct from patients with chronic gastritis and healthy individuals[59]. Therefore, it is necessary to further analyze the gastric microorganisms and explore the possible underlying pathogenesis of microbial dysbiosis in the progression to carcinoma to provide guidance for preventative, screening and therapeutic strategies for GC.
The diverse risk and protective factors of GC are dietary or lifestyle-related factors[60], and unhealthy dietary habits and lifestyle factors may account for 33%-50% of all GC cases[10,61]. Lower intake of fruit and vegetables, higher intake of salt or salted/processed food, and tobacco and alcohol consumption are GC risk factors[60,62,63]. For example, a 5 g/day increase in salt intake increased the risk of GC by 12%[53]. Excessive salt intake may destroy the gastric mucosa and increase DNA synthesis and cell proliferation to promote the development of GC[64], and excessive salt intake also acts synergistically with H. pylori to increase GC incidence[60,65,66]. However, no scientific evidence has confirmed a definite causal association between excessive salt intake and GC risk[60]. Tobacco consumption is also an important behavioral risk factor for GC and may increase GC risk by approximately 50% in males and 20% in females according to relevant data[32,67,68]. Tobacco consumption may induced chronic inflammation in the gastrointestinal tract, alter mucosal cell proliferation, promote immune dysfunction, and increase the risks of bacterial or viral infections, which leads to the carcinogenesis of GC[69]. Alcohol consumption also positively correlates with GC risk[69-71]. These two factors, tobacco and alcohol consumption, affect GC development independently in high-risk populations, and modification of these unhealthy choices may significantly reduce the incidence and mortality of GC[72]. In contrast, increased fresh fruit and vegetable consumption may inhibit GC development and reduce its risk[53]. Specifically, a systematic review and dose-response meta-analysis found that a 100 g/day increase in fruit consumption inversely associated with a 5% reduction in GC risk[53]. Another meta-analysis also indicated that the relationship between intake of citrus fruit and risk of cardia GC was statistically significant, and daily intake of 100 g citrus fruit reduced GC risk by 40%[73], which suggests that phytochemicals in fruit may have antioxidant effects, prevent or reduce DNA oxidation, and regulate cell proliferation and apoptosis[74]. The history of medication may affect GC pathogenesis, and the use of aspirin and other nonsteroidal anti-inflammatory drugs may lower GC risk[75].
In summary, various known and unknown factors may be related to GC risk, and understanding the underlying mechanisms will facilitate appropriate preventative and screening strategies to reduce GC incidence.
Although the incidence of GC in males is significantly higher than females[1], few studies have focused on sex differences in GC prognosis. The relationships between race, gene polymorphism and GC prognosis have been explored in many studies[76,77]. Current data show high GC incidences in Asian populations and better GC prognosis in Asian GC patients than Caucasian populations, even after controlling for other well-known prognostic factors[78-80]. However, whether differences exist due to different management strategies or distinct races and tumor biology is not clear. Increasing evidence indicates that genetic polymorphisms are associated with GC survival, and single nucleotide polymorphisms (SNPs) are novel biomarkers of cancer susceptibility, progression and prognosis[81,82]. For example, Gonzalez-Hormazabal et al[83] found that allele A carriers of IL-8 rs4073 were associated with lower OS in GC. The role of ERCC1 SNPs was also extensively studied in patients with gastrointestinal tumors receiving oxaliplatin-based chemotherapy, and ERCC1 rs11615 polymorphisms were closely associated with the clinical outcomes of GC[84]. Wang et al[85] showed that lncRNA H19 rs2839698 was also related to the OS of GC patients. However, more prospective studies with larger sample sizes are needed to verify the above conclusions and elucidate the underlying mechanisms of SNPs in GC prognosis.
The Lauren classification[86] is globally recognized as the classification system for GC. According to the Lauren classification[86], GC is classified into intestinal and diffuse types, and diffuse GC generally has a poor prognosis compared to intestinal GC[87-89]. The survival of GC is strongly related to the stage at diagnosis. For patients with early GC, the cancerous area is localized with no local or distant metastasis, and these patients generally have a better prognosis than patients with advanced GC[4]. The cancer site in advanced GC patients is not localized and generally accompanied by metastasis[90]. GC easily recurs even after surgical resection, and it generally has a poor prognosis[91]. Tumor size, depth of invasion, lymph node metastasis (LNM), and tumor-node-metastasis stage are important prognostic factors[5]. For example, the 5-year survival rate of patients with proximal GC is lower than patients with distal GC, which indicated the correlation of tumor location and GC prognosis[5]. Notably, a Chinese study[92] recruited 611 patients with early GC and showed no significant difference in 5-year survival between mucosal and submucosal cancers. Notably, LNM may be a significant prognostic factor for early GC[92,93], and the 5-year survival rate may be twice as high in patients without LNM than patients with LNM[94].
A variety of factors affect GC prognosis, including patient-related factors (gender, age, race), tumor-related factors (tumor location, histological type, depth of invasion, and metastasis) and treatment-related factors. We primarily focused on the prognostic factors related to GC treatment.
Surgery is the basis of GC treatment, and it is the only procedure that completely eradicates GC lesions[3,91,95]. Surgical options primarily include endoscopic mucosal resection, distal esophagectomy, subtotal gastrectomy or total gastrectomy[96]. The surgical strategies depend on the tumor location and invasion depth, and may vary in different institutions. For early GC with a low LNM risk, endoscopic treatment or surgery alone may be effective, and patients with advanced GC may benefit from broad lymph node dissection and multimodal therapies[97]. In terms of the extent of lymph node dissection (D), current data indicate that D2 lymph node dissection is the most recommended surgical procedure for advanced GC, and GC patients may have a higher 5-year survival rate after D2 lymph node dissection than after D1 dissection[98]. Accurate preoperative staging and resection evaluation are key factors in successful surgery for GC[95]. The precision medicine of surgical strategies for GC, by the concept of accelerated rehabilitation, includes minimally invasive surgery, precise operation of intraoperative fluorescence navigation and precise perioperative management[95]. Compared to traditional surgery, minimally invasive surgery, including laparoscopy and da Vinci robot-assisted surgery, may reduce surgical trauma and improve recovery after surgery[99]. Although no significant differences in postoperative outcomes were found between laparoscopic and robotic gastrectomies, robotic gastrectomy may require a longer surgical duration and greater financial cost, and is not superior to laparoscopic procedures in perioperative surgical outcomes[99]. Patients with advanced GC need lymph node dissection, which is difficult and complicated. Therefore, whether laparoscopy is suitable for these patients needs further evaluation[95].
Because most GC patients are in advanced stages at initial diagnosis, surgery alone may not be sufficient to treat this malignancy, and therapeutic methods other than surgery should also be performed to improve the survival of operable GC patients[95]. As another important conventional treatment, chemotherapy is classified as perioperative, neoadjuvant or adjuvant, and palliative chemotherapy[28]. The OS of GC patients was significantly improved with perioperative chemotherapy compared to GC patients after surgical resection alone, and perioperative chemotherapy also increased the OS compared to postoperative chemotherapy[100,101]. Specifically, there are several combined options for chemotherapy strategies[28,102,103], including neoadjuvant triple chemotherapy, such as docetaxel, oxaliplatin and S-1 (DOS) or Epirubicin, cisplatin and 5-fluorouracil (ECF), and double chemotherapy, such as capecitabine and oxaliplatin (XELOX), tegafur and cisplatin (SP) or 5-fluorouracil and oxaliplatin (FOLFOX). The ToGA trial[104] showed that trastuzumab in combination with chemotherapy improved survival for HER2-positive GC patients, and an anti-HER2 targeting strategy was proposed as a standard option for HER2-positive GC patients. For example, trastuzumab plus XELOX, trastuzumab in combination with capecitabine, or bevacizumab and trastuzumab combined with docetaxel, oxaliplatin and capecitabine achieved encouraging efficacy and safety for patients with HER2-positive advanced GC, and may be considered first-line treatments for these patients, but further evaluation is warranted[105-107]. However, trastuzumab combined with DOS showed less effectiveness than trastuzumab in combination with XELOX, and further investigation is ongoing[108]. The use of radiotherapy in GC treatment has become more common with the advancement of radiotherapy-related technology[109]. Radiotherapy is generally combined with surgery, chemotherapy, molecular targeted therapy or other treatments, and these combinations eventually benefit GC patients[28]. Radiotherapy may be used as an important adjuvant therapy in the perioperative period for patients with advanced operable GC, especially for some patients after D2 Lymphadenectomy, and it effectively improved progression-free survival time and reduced the local recurrence rate[109]. Notably, perioperative chemotherapy or postoperative chemotherapy plus radiotherapy are listed as preferred strategies in certain guidelines[30]. For GC patients in the early-stage with LNM, OS may be improved after the adoption of adjuvant chemotherapy and radiotherapy, but the benefit was less certain for adequately staged GC patients without LNM[110].
Although surgery, chemotherapy, molecular targeted therapy, radiotherapy or combined modality treatment improved the survival of GC patients[30,91], these treatments have limited efficacies in treating patients with advanced GC, and potential therapeutic strategies are urgently needed for these advanced GC patients. A number of recent studies[111,112] found that immune-based therapy for solid malignancies produced good results and significantly prolonged survival, and immunotherapy showed certain positive efficacies for GC patients compared to other traditional therapies[113-115], which may bring new hope to GC patients[116]. There are three main immunotherapeutic options for GC, including immune checkpoint inhibitors (ICIs), cellular immunotherapy and cancer vaccines.
As a co-suppressor molecule, the immune checkpoint regulates the survival, proliferation, differentiation or response to homologous antigens of T cells via the major histocompatibility complex-T-cell receptor, prevent excessive immune responses, and maintain the immune homeostasis in the human body[117,118]. Tumor cells in patients with malignant diseases could inhibit T cells then escape immune responses via the mechanisms described above[119]. Immunosuppressants are primarily used to reactivate the immune responses of T cells to tumor cells by blocking immune checkpoints or corresponding ligands/receptors with antibodies[120]. ICIs have been widely investigated[121], and these monoclonal antibodies[30] primarily target programmed cell death protein-1 (PD-1), programmed death ligand-1 (PD-L1) or cytotoxic T-lymphocyte antigen 4 (CTLA-4). PD-1 is a co-inhibitory receptor that is primarily expressed on the surface of activated T cells, Treg cells and monocytes. As the ligand of PD-1, PD-L1 binds to the PD-1 receptor and induces the inhibition or apoptosis of related immune cells, which helps tumor cells escape immune responses[122]. Moreover, PD-L1 is overexpressed in advanced GC, and its expression may relate to the tumor size, depth of invasion and LNM in 25%-65% of GCs[122-124]. Furthermore, clinical trials indicated that anti-PD-1 therapy for GC patients may have certain effectiveness. The first randomized phase III study demonstrated that the anti-PD-1 monoclonal antibody, nivolumab, effectively improved survival of patients with advanced gastric or gastric-oesophageal junction cancer[125]. Another famous phase II clinical KEYNOTE-059 trial recruited 259 patients from 16 countries and showed that the PD-1/PD-L1 inhibitor pembrolizumab also had similar efficacy and safety for advanced GC patients[126]. Researchers in the phase III CheckMate-649 trial found that nivolumab combined with fluorouracil and platinum as first-line medications improved the OS of patients with advanced HER2-negative GC, gastroesophageal junction cancer or esophageal adenocarcinoma[127]. Mid-term analysis of the KEYNOTE-811 test showed that the combination of pembrolizumab and trastuzumab plus chemotherapy improved the overall response rate (ORR) of patients with advanced HER2-positive GC[128]. CTLA-4 is also found on the surface of activated T cells and may interact with B7-1/B7-2 on the surface of antigen-presenting cells, which results in inhibition of the CD28 signaling pathway, and plays a key role in T-cell activation[119,129]. A monoclonal anti-CTLA-4 antibody targets T-cell co-inhibitory receptor and reactivates T-cell anti-tumor immune activity[130]. However, preliminary studies indicated that some GC patients showed ineffectiveness or even remission after treatment with monoclonal anti-CTLA-4 antibodies, and the objective response rate with antibodies alone was not satisfactory because only one of 18 patients (5.5%) reached the primary endpoint[131]. Besides, the monoclonal anti-CTLA-4 antibody ipilimumab alone as the maintenance therapy did not show any improvements in FPS for patients with unresectable locally advanced or metastatic GC compared with the best supportive care in a phase II clinical trial[132]. One study, focused on the therapeutic efficacies of PD-1 and CTLA4 inhibitors, found that the ORR of patients with metastatic GC who received nivolumab plus ipilimumab was higher than patients who received only nivolumab[133]. However, Shitara et al[134] recently found that nivolumab plus ipilimumab did not improve the OS of HER2-negative patients compared to the chemotherapy regimen in advanced GC patients.
The 2022 National Comprehensive Cancer Network Guidelines proposed PD-1/PD-L1 inhibitors as first-line/second-line medications for GC treatment, but anti-CTLA4 immunotherapy was not suggested in GC treatment. However, clinical trials on anti-CTLA4 antibodies (ipilimumab and tremelimumab) are being performed[135]. Clinical trials on many other immunosuppressants, such as LAG3, Tim3, TIGIT and OX40, are also being performed. LAG3 and Tim3 are in phase I and II clinical trials, and TIGIT and OX40 are in the early research stage[136]. Although the toxicity of ICIs may limit their efficacy and clinical application[137], current evidence indicates that the combined modality of ICIs with other treatments may be more effective and applicable in GC, especially when combined with chemotherapy for advanced GC patients with drug resistance[116,138].
Cellular immunotherapy uses immune cytotoxic cells to recognize and attack tumor cells, and induce an effective antitumor response[138]. These immune cells may be expanded T cells and nature killer cells in vitro or gene-engineered T-cell receptor (TCR) T cells (TCR-Ts) and chimeric antigen receptor (CAR) T cells (CAR-Ts)[138,139]. TCR-T/CAR-T immunotherapies, as modified T-cell-based immunotherapeutic approaches, are targeted cellular therapies that take advantage of the cytotoxic potential of T cells to attack tumor cells in an antigen-specific manner[140]. For TCR-T immunotherapy, the target TCR genes that recognize specific tumor-associated antigens (TAAs) are transduced into peripheral blood T cells collected from patients, and these modified T cells are reinjected into the patients’ circulation[138]. TAAs are presented by major histocompatibility complex-I (MHC-I) to TCR-Ts within the patient, and the combination of TAAs with TCR could activate these T cells to release cytokines and attack tumor cells[141]. TCR-Ts expressing KK-LC-1 (encoded by CT83) TCR recognized CT83+ tumor cells in vitro, and KK-LC-1 is frequently expressed in human epithelial tumors, including GC with the highest expression[142]. NY-ESO-1 antibody positivity was also found in GC, which indicated that NY-ESO-1 may be another target for TCR-T immunotherapy of GC[143]. Although TCR-T immunotherapy is being applied in clinical treatment, there are still some challenges. For example, it is difficult to generate a universal TCR for immunotherapy because of the extreme polymorphism of the MHC locus[141]. To resolve these issues, CAR was developed based on antibody recognition specificities[141], and CAR-Ts are considered a promising class of antitumor treatment[144]. T cells are collected from autologous peripheral blood, genetically modified to produce specific CARs, namely CAR-Ts, then reinjected into the patient’s circulation[145-147]. CAR-Ts recognize and combine the specific antigen on the surface of tumor cells by the extracellular single-chain fragment variable domain, which results in the immobilization and clustering of CARs, the formation of nonclassical immune synapses and activation of CAR-Ts[141]. In contrast to MHC-restricted TCR-Ts, CAR-Ts are typically designed and engineered to recognize non-MHC cell surface proteins[141]. The density of the target antigen is particularly important in the modulation of CAR-T-cell signaling compared to TCR-Ts[141]. Only one kind of targeted tumor antigen may not be sufficient to obtain satisfying antitumor responses, and the expression of targeted antigen in other body cells inevitably results in transient and reversible harmful effects, such as cellular toxicity[144]. Several potential targets, such as NKG2D, FOLR1, HER2, MSLN and CLDN18.2, were found, and the real therapeutic efficacies need further evaluation[148-152]. Therefore, targeting GC-specific antigens remains a challenge, and the lack of truly GC-specific antigens limits the clinical application of CAR-T immunotherapy[144].
As an active antitumor immunotherapy, cancer vaccines are designed to enhance body immune function by inducing humoral and/or cellular immune responses[139,153]. Cancer vaccines primarily include autologous tumor cell vaccines, dendritic cell vaccines, peptide vaccines and genetically engineered vaccines[138]. Patients with gastroesophageal adenocarcinoma or untreated metastatic GC may have higher median OS rates after receiving the G17DT (Aphton) vaccine[154], and vaccination improved the OS of GC patients with good safety and tolerance, especially when combined with chemotherapy[116]. The immune responses (e.g., changes in immune milieu and tumor immune escape mechanisms) to cancer vaccines may be rapidly and accurately monitored using molecular sequencing, artificial intelligence or cellular engineering, which could optimize the design of cancer vaccines and facilitate their clinical application[155].
The incidence and mortality of GC have shown a downward trend worldwide, which suggests that GC may become a rare disease in the future[16]. However, GC incidence and mortality rank fifth and fourth, respectively, among all cancer types worldwide, and it remains a major health challenge[16]. With regard to the identified GC risk factors, such as H. pylori infection and unhealthy dietary habits and lifestyle, preventive strategies could effectively reduce GC incidence. Therefore, more attention should be given to individuals at higher risk, and unified guidelines for GC surveillance should be established. Due to the different staging and therapeutic strategies used in different regions, the prognosis of GC patients varies greatly. Most GC cases are found in advanced stages at diagnosis, which limits the clinical application and efficacy of surgery[156]. Although chemotherapy has significantly improved the prognosis of advanced GC patients, enormous challenges remain, such as drug resistance and toxicity[107]. With the emergence and promising development of immunotherapy, its clinical application and efficacy have been evaluated in GC patients, especially in advanced GC patients. However, due to the complicated tumor microenvironment and the complex interactions between the immune system and tumor cells, more clinical trials on immunotherapy are needed to verify their efficacy and safety in GC patients.
We thank the International Agency for Research on Cancer/World Health Organization (IARC/WHO) for the copyright permission to re-use related data and reprint related illustrations.
Provenance and peer review: Invited article; Externally peer reviewed.
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Specialty type: Gastroenterology and hepatology
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P-Reviewer: Endo S, Japan; Lieto E, Italy S-Editor: Zhang H L-Editor: A P-Editor: Yu HG
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