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HOME > Clin Endosc > Volume 51(3); 2018 > Article
Review Metachronous Gastric Cancer Following Curative Endoscopic Resection of Early Gastric Cancer
Seiichiro Abe1,orcid, Ichiro Oda1, Takeyoshi Minagawa2, Masau Sekiguchi1, Satoru Nonaka1, Haruhisa Suzuki1, Shigetaka Yoshinaga1, Amit Bhatt3, Yutaka Saito1
Clinical Endoscopy 2018;51(3):253-259.
DOI: https://doi.org/10.5946/ce.2017.104
Published online: September 18, 2017

1Endoscopy Division, National Cancer Center Hospital, Tokyo, Japan

2Department of Gastroenterology, Tonan Hospital, Sapporo, Japan

3Department of Gastroenterology and Hepatology, Digestive Disease Institute, Cleveland, OH, USA

Correspondence: Seiichiro Abe Endoscopy Division, National Cancer Center Hospital, 5-1-1 Tsukiji, Chuo, Tokyo 104-0045, Japan Tel: +81-3-3542-2511, Fax: +81-3-3542-3815, E-mail: seabe@ncc.go.jp
• Received: June 29, 2017   • Accepted: July 27, 2017

Copyright © 2017 Korean Society of Gastrointestinal Endoscopy

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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  • This review article summarizes knowledge about metachronous gastric cancer (MGC) occurring after curative endoscopic resection (ER) of early gastric cancer (EGC), treatment outcomes of patients who developed MGC, and efficacy of Helicobacter pylori eradication to prevent MGC. The incidence of MGC following curative ER increases over time and is higher than in patients undergoing gastrectomy. Increasing age and multifocal EGC are independent risk factors for developing MGC. An MGC following curative ER is usually a small (<20 mm) and differentiated intramucosal cancer. Most MGC lesions are found at an early stage on semiannual or annual surveillance endoscopy and are successfully treated by further ER, with excellent long-term outcomes. Eradication of H. pylori may reduce the risk of MGC following ER of EGC, but further prospective studies with long-term outcomes are required. Surveillance endoscopy following gastric ER should be continued indefinitely, due to the risk of MGC even after successful H. pylori eradication. Risk stratification and tailored endoscopic surveillance schedules need to be developed.
  • Keywords: Metachronous gastric cancer; Endoscopic resection; Endoscopic mucosal resection; Helicobacter pylori; Surveillance endoscopy
Approximately one million new gastric cancer cases occurred in 2012, making it the fifth most common malignancy and the third leading cause of cancer death worldwide [1]. Development of screening esophagogastroduodenoscopy (EGD) programs has led to the detection of gastric cancer at earlier stages, and approximately half of all gastric cancers in Japan are detected at a stage when they are confined to the mucosa or submucosa [2].
Increasing numbers of early gastric cancer (EGC) cases have been treated with endoscopic resection (ER), as curative resection was defined based on large retrospective cohort in surgery cases and the development of endoscopic submucosal dissection (ESD) has allowed for high en bloc and curative resection rates of EGC, regardless of size and location [3-6]. Several retrospective studies have shown excellent long-term outcomes in EGC patients undergoing curative gastric ESD [7-16]. In addition, ESD preserves stomach function and maintains quality of life in those patients who achieve curative ER [17].
A drawback of ER for EGC is the risk of developing metachronous gastric cancer (MGC) in the remaining native stomach. As the popularity of this technique increases, it is vitally important to characterize risk factors and long-term outcomes for those patients who develop MGC. This review article summarizes the definition, incidence, clinical characteristics, and outcomes of MGC.
Gastric cancer detected on surveillance EGD following curative ER may be a de novo lesion, a previously invisible preclinical lesion, or a missed lesion. Determining which of these possibilities is the case can be extremely difficult. General consensus, based on previous publications, is that gastric cancers detected within 1 year after ER should be regarded as a missed synchronous gastric cancer [18-21]. Thus, MGC is generally defined as a gastric cancer located distant from the original EGC over 1 year following index ESD.
Studies have reported an incidence of MGC following ER for EGC ranging from 2.7% to 15.6% (Table 1) [20,22-30]. In these studies, all MGCs were detected on surveillance EGD, and no study reported detection of EGC by barium contrast or computed tomography. ESD was preferred over endoscopic mucosal resection (EMR) in these series.
Kobayashi et al. reported that MGCs developed in 30 of 234 patients during a median follow-up of 5.0 years [28]. They also demonstrated that a Kaplan-Meier curve of cumulative incidence of MGC stopped increasing after 10 years of follow-up [28]. In contrast, Kato et al. and Min et al. reported that the cumulative incidence curve revealed a linear increase in much larger cohorts [24,29]. We also demonstrated that 5-year, 7-year, and 10-year cumulative incidence of MGC (adjusted for risk of death from other causes) on surveillance endoscopy was 9.5%, 13.1%, and 22.7%, respectively, with a median follow up of 82.2 months [30].
Following gastrectomy, the cumulative incidence of MGC is 0.9%–3.0% [31-34]. The incidence of MGC in patients undergoing ER is much higher. This difference is explained by the organ-sparing nature of ER, as while maintaining luminal continuity offers an improved quality of life, the remaining gastric mucosa continues to be at risk of MGC.
Although methods used to analyze risk factors for MGC vary among studies, older age, multiple initial EGCs and persistent Helicobacter pylori infection are considered to be common risk factors (Table 2) [25,28-30,35-37]. As older age is a greater potential risk factor for gastric cancer and multifocal lesions tend to develop in gastric mucosa with high risk field changes, these factors are unsurprising. Persistence of H. pylori infection as a risk factor is less straightforward. Persistence should be positively correlated with recurrence risk; however, Lim et al. reported that the absence of H. pylori infection is an independent risk factor for metachronous neoplasms, including dysplasia [38]. One possible explanation for this divergent finding is that long-term H. pylori infection may result in severe atrophic gastritis with intestinal metaplasia, such that H. pylori is no longer detectable. Long-term infection might have had more effect on metachronous tumorigenesis than newly developed H. pylori infections that can be easily detected [39].
According to recent publications, MGCs are commonly characterized as small, differentiated intramucosal cancers <20 mm in size [26-28]. MGCs often develop when the initial lesion is a differentiated EGC. This suggests that this type of cancer tends to develop in gastric mucosa during field cancerization [40,41].
Regular endoscopic surveillance detects MGC at an early stage, allowing for repeat curative ESD resection in the majority of cases, according to absolute or expanded indications based on the Japanese Gastric Cancer Treatment Guidelines [5,23-25,29,30]. Kato et al. reported that only 4 of 175 synchronous or metachronous cancers invaded the submucosa or deeper layers [24]. Our study showed that 215 of 238 patients with MGC underwent ER (mostly ESD), and the en bloc resection, R0 resection, and curative resection rates were 99.3%, 94.3%, and 88.8%, respectively [30].
In addition, excellent long-term outcomes have been shown by Kato et al. in his multicenter, retrospective cohort study, in which no patients died of gastric cancer during a mean follow-up period of 26.8 months [24]. Our study showed a 5-year disease-specific survival rate of 99.2% in patients undergoing curative gastric ESD; of the 238 patients who developed MGC, only 7 died of MGC during a median follow-up of 82.2 months. The patients who died from MGC were lost to follow-up, and did not undergo the surveillance endoscopy that may have detected their cancers at an earlier and more treatable stage. Five of the patients died from MGC more than 5 years after their index ESD.30 These studies support the clinical validity of an organ-preserving strategy with surveillance endoscopy and repeated ESD.
Treatment outcomes for gastric cancer are generally evaluated with 5-year overall and disease-specific survival. A limited 5-year follow-up may be reasonable for patients undergoing gastrectomy, as a majority of postoperative lymph node or distant recurrences occur within 5 years, and the risk of MGC development is much lower than in those treated with ER [42]. On the other hand, indefinite endoscopic surveillance is required to detect and remove MGCs in patients treated endoscopically.

H. PYLORI ERADICATION FOLLOWING ER

H. pylori infection is characterized by progression through the following stages: chronic active gastritis, atrophy, intestinal metaplasia, and dysplasia, followed by the development of gastric adenocarcinoma. H. pylori infection is considered one of the most important risk factors for gastric cancer [43-47]. In 1994, the International Agency for Research on Cancer, a subsidiary of the World Health Organization, categorized H. pylori as a group 1 carcinogen for gastric cancer [48]. Uemura et al. concluded that gastric cancer develops in persons infected with H. pylori, but not in uninfected persons [49]. Take et al. showed that H. pylori eradication has preventative effects on the occurrence of initial gastric cancer [50]. In addition, persistent H. pylori infection was considered to a risk factor for MGC after ER in a number of retrospective studies, as shown in Table 2 [36,37].
Thus, it would seem reasonable to assume that H. pylori eradication would have a potential prophylactic effect on MGC following ER [51]. However, two recent large, prospective randomized trials have shown contradictory results. Fukase et al. reported that the cumulative incidence of MGC was 6.5% during a 3-year follow-up, and patients receiving H. pylori eradication treatment showed significantly lower MGC rates than patients without eradication therapy (3.5% vs. 9.6%, p=0.003) [52]. On the other hand, Choi et al. concluded that the cumulative incidence of MGC was comparable in patients with and without H. pylori eradication treatment during a 3-year follow-up (2.3% vs. 3.9%, p=0.24) [53]. Other retrospective studies showed similarly controversial conclusions (Table 3) [35-37,54-58], but meta-analyses by Jung et al. and Yoon et al. concluded that H. pylori eradication could play a preventative role by reducing the occurrence of MGC in patients who have undergone ER [59,60].
Therefore, H. pylori eradication should be considered as preventative of MGC after ER. It should be noted that the definitions of MGC were not consistent among the studies and that some previous studies did not distinguish MGC from synchronous gastric cancer. In addition, the median follow-up periods were less than 5 years in a majority of previous publications and the timing of H. pylori eradication could affect the results. Further prospective studies in the ESD era with long follow-up periods might help clarify the preventative effect of H. pylori eradication for MGC occurrence.
MGCs following successful H. pylori eradication were mainly characterized as small, differentiated EGCs. Mori et al. showed that MGCs were 15 mm in median tumor size, and were commonly located at the middle or lower third of the stomach [61]. Of these, 97% of MGCs were differentiated EGCs and 90% of these were confined to the mucosa. Curative ESD resection was done for all MGCs according to the Japanese Gastric Cancer Treatment Guidelines, except for one differentiated T1b (submucosal invasion to 80 μm) cancer 4 mm in size with lymphatic involvement [61]. Regular endoscopic surveillance would probably play a significant role in early detection. MGCs following H. pylori eradication were sometimes covered by non-neoplastic epithelium.
This histological alteration made it more difficult to detect MGC and delineate its margin, even with magnified narrow-band imaging [62,63]. Yamamoto et al. reported that the average diameter of an MGC following successful eradication was smaller and the Ki-67 index was lower than in cases with persistent H. pylori infection [64].
Moribata et al. analyzed endoscopic mucosal background features associated with MGC in patients who underwent H. pylori eradication therapy and concluded the absence of intestinal metaplasia prior to ESD was a negative predictor of MGC after ESD, and the emergence of map-like redness after H. pylori eradication was a positive predictor for MGC after ESD [65]. Mori et al. and Shiotani et al. supported this conclusion and showed that widespread gastric mucosal atrophy and multiple gastric cancers before successful H. pylori eradication were risk factors for MGC occurrence following H. pylori eradication [54,61].
There are some established guidelines for surveillance interval in patients undergoing curative ER. The National Comprehensive Cancer Network guidelines state that even for Tis or T1 with N0 lesions achieving R0 with ER or surgery, all patients should be followed up systematically, and follow-up should include a complete history and physical examination every 3 to 6 months for 1 to 2 years, every 6 to 12 months for 3 to 5 years, and annually thereafter all patients [66]. The Japanese gastric cancer treatment guidelines recommend annual or biannual endoscopy after curative ESD for patients with EGC who meet expanded indications criteria [5].
Given that most of the MGCs were found in early stages and were successfully treated with ER in many previous reports, annual or biannual endoscopic surveillance may be reasonable. As the individual risk of MGC can vary greatly among patients, risk stratification and tailored follow-up schedules should be considered, similar to surveillance colonoscopy after endoscopic polyp removal [67]. In addition, we are performing a prospective study to evaluate epigenetic cancer risk prediction of MGC after H. pylori eradication. We hope that these results will provide more detailed data on the stratification of risk factors for MGC following H. pylori eradication [68]. Further prospective studies are warranted to determine appropriate surveillance intervals. Regarding the surveillance period, as the cumulative incidence of MGC linearly increased and some patients died of MGC more than 5 years after treatment, endoscopic surveillance should be performed indefinitely [30]. In addition, Mori et al. reported that the 5-year cumulative incidence of MGC even after successful H. pylori eradication was 15.0% during a 4.5-year median follow-up period [61]. This multicenter, prospective study also showed that 11% of MGCs (10 of 94) were detected more than 5 years after successful H. pylori eradication [61]. Therefore, continuous surveillance endoscopy should be performed to identify MGC in patients who have undergone ER for EGC, regardless of success or failure of H. pylori eradication.
EGC patients who undergo ER are at significant risk of developing MGC, but with annual or biannual surveillance EGD, MGC can be detected at an early stage when it is amenable to curative ESD resection. H. pylori eradication may reduce the incidence of MGC, but does not completely eradicate risk. Surveillance endoscopy should be continued indefinitely as cumulative incidence of MGC linearly increases. As we gain understanding of MGC, we hope that tailored surveillance intervals are developed, similar to those used to predict colonoscopy surveillance intervals based on the characteristics of the polyps removed. ESD for EGC preserves the quality of life by retaining the native stomach; however, the native stomach is at high risk for developing other gastric cancers. These patients should undergo life-long endoscopic surveillance for detection of MCG at an early and treatable stage.
Part of this work was supported by the National Cancer Center Research and Development Fund (25-A-12 and 28-K-1).
Table 1.
Incidence of Metachronous Gastric Cancer following Endoscopic Resection
Study Methods of endoscopic resection Rate of MGC Follow up period (yr) Annual incidence of MGC
Kim et al. (2007) [22] EMRa) 2.70% 11/379 1.9 Median -
Lee et al. (2011) [23] ESD 3.30%b) 15/458 2.2 Median -
Kato et al. (2013) [24] ESD 5.20% 65/1258 2.2 Mean 3.50%
Hahn et al. (2016) [25] ESD 4.30% 58/1347 2.4 Median 2.48%
Nakajima et al. (2006) [26] EMR and ESD 8.20% 52/633 4.4 Mean -
Nasu et al. (2005) [27] EMR 14% 20/143 4.8 Median Approximately 4%
Kobayashi et al. (2010) [28] EMR and ESD 12.80% 30/234 5 Median -
Min et al. (2015) [29] ESD 3.60% 47/1306 5 Median -
Abe et al. (2015) [30] ESD 15.60% 238/1527 6.6 Median -
Arima et al. (1999) [20] EMR 7.90% 6/76 7 -c) -

MGC, metachronous gastric cancer; EMR, endoscopic mucosal resection; ESD, endoscopic submucosal dissection.

a) Only R0 resection in patients with intramucosal cancer was included.

b) Synchronous lesion was included for analysis.

c) All patients were followed up for 7 year.

Table 2.
Intervals of Surveillance Endoscopy and Risk Factors of Metachronous Gastric Cancer following Endoscopic Resection
Study Intervals of Surveillance endoscopy for MGC Risk factors of metachronous gastric cancers
Lee et al. (2011) [23] Biannual then annual -
Kato et al. (2013) [24] Annual or biannual -
Hahn et al. (2016) [25] Annual or biannual Older age, intestinal metaplasia, ESD criteria
Nakajima et al. (2006) [26] Annual -
Nasu et al. (2005) [27] Annual -
Kobayashi et al. (2010) [28] Annual Multiple initial EGC, male, same third of the stomach
Min et al. (2015) [29] Annual or biannual Multiple initial EGC, well differentiated adenocarcinoma of initial EGC
Abe et al. (2015) [30] Annual or biannual Multiple initial EGC, male
Arima et al. (1999) [20] - Multiple initial EGC
Maehata et al. (2012) [35] Annual or biannual Follow-up period over 5 years, severe gastric mucosal atrophy
Kwon et al. (2014) [36] Annual Age ≥60 years old, persistent Helicobacter pylori infection
Kim et al. (2014) [37] Annual Age ≥65 years old, persistent H.pylori infection, family history of gastric cancer

MGC, metachronous gastric cancer; ESD, endoscopic submucosal dissection; EGC, early gastric cancer.

Table 3.
Incidence of Metachronous Gastric Cancer following Successful Helicobacter pylori Eradication
Study Design Numbera) Follow up Period (yr) Incidence Effect Results
Uemura et al. (1997) [51] NR 65/67 - - 0.0/9.0% Effective p=0.011
Fukase et al. (2008) [52] RCT 255/250 2.9/2.9a) Median 3.5/9.6% Effective p=0.003b), OR=0.34
Shiotani et al. (2008) [54] Single arm -/80 2.8 Median 11.3%
Maehata et al. (2012) [35] Retrospective 177/91 3 Median 8.5/14.3% Non-effective p=0.262
Choi et al. (2014) [53] RCT 439/441 3 Median 2.3/3.9% Non-effective p=0.15
Seo et al. (2013) [55] Retrospective 61/13 2.3 Mean 9.8/23.1% Non-effective p=0.189, OR=0.36
Chon et al. (2013) [56] Retrospective 85/44 2.2 Median 4.7/11.4% Effective p=0.008, HR=0.143
Kwon et al. (2014) [36] Retrospective 214/69 3.4 Median 4.7/14.5% Effective p=0.009
Kim et al. (2014) [37] Retrospective 49/107 5.3/4.6a) Median 4.1/15.0% Effective p=0.006
Bae et al. (2014) [57] Retrospective 485/182 5c) Median 7.0/13.2% Effective p=0.02, HR=1.9
14.7/29.7/1,000 pt yr
Jung et al. (2015) [58] Retrospective 506/169 3.3c) Median 4.2/5.9% Non-effective p=0.29, HR=0.67
Mori et al. (2016) [61] Single arm -/594 4.5 Median 29.9/1,000 pt yr

NR, non-randomized; RCT, randomized controlled trial; OR, odds ratio; HR, hazard ratio.

a) Eradicated group/Persistent infection group.

b) Modified intention to treat analysis.

c) Including gastric dysplasia, including Helicobacter pylori non-infection group.

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      Metachronous Gastric Cancer Following Curative Endoscopic Resection of Early Gastric Cancer
      Clin Endosc. 2018;51(3):253-259.   Published online September 18, 2017
      DOI: https://doi.org/10.5946/ce.2017.104
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    Metachronous Gastric Cancer Following Curative Endoscopic Resection of Early Gastric Cancer
    Metachronous Gastric Cancer Following Curative Endoscopic Resection of Early Gastric Cancer
    Study Methods of endoscopic resection Rate of MGC Follow up period (yr) Annual incidence of MGC
    Kim et al. (2007) [22] EMRa) 2.70% 11/379 1.9 Median -
    Lee et al. (2011) [23] ESD 3.30%b) 15/458 2.2 Median -
    Kato et al. (2013) [24] ESD 5.20% 65/1258 2.2 Mean 3.50%
    Hahn et al. (2016) [25] ESD 4.30% 58/1347 2.4 Median 2.48%
    Nakajima et al. (2006) [26] EMR and ESD 8.20% 52/633 4.4 Mean -
    Nasu et al. (2005) [27] EMR 14% 20/143 4.8 Median Approximately 4%
    Kobayashi et al. (2010) [28] EMR and ESD 12.80% 30/234 5 Median -
    Min et al. (2015) [29] ESD 3.60% 47/1306 5 Median -
    Abe et al. (2015) [30] ESD 15.60% 238/1527 6.6 Median -
    Arima et al. (1999) [20] EMR 7.90% 6/76 7 -c) -
    Study Intervals of Surveillance endoscopy for MGC Risk factors of metachronous gastric cancers
    Lee et al. (2011) [23] Biannual then annual -
    Kato et al. (2013) [24] Annual or biannual -
    Hahn et al. (2016) [25] Annual or biannual Older age, intestinal metaplasia, ESD criteria
    Nakajima et al. (2006) [26] Annual -
    Nasu et al. (2005) [27] Annual -
    Kobayashi et al. (2010) [28] Annual Multiple initial EGC, male, same third of the stomach
    Min et al. (2015) [29] Annual or biannual Multiple initial EGC, well differentiated adenocarcinoma of initial EGC
    Abe et al. (2015) [30] Annual or biannual Multiple initial EGC, male
    Arima et al. (1999) [20] - Multiple initial EGC
    Maehata et al. (2012) [35] Annual or biannual Follow-up period over 5 years, severe gastric mucosal atrophy
    Kwon et al. (2014) [36] Annual Age ≥60 years old, persistent Helicobacter pylori infection
    Kim et al. (2014) [37] Annual Age ≥65 years old, persistent H.pylori infection, family history of gastric cancer
    Study Design Numbera) Follow up Period (yr) Incidence Effect Results
    Uemura et al. (1997) [51] NR 65/67 - - 0.0/9.0% Effective p=0.011
    Fukase et al. (2008) [52] RCT 255/250 2.9/2.9a) Median 3.5/9.6% Effective p=0.003b), OR=0.34
    Shiotani et al. (2008) [54] Single arm -/80 2.8 Median 11.3%
    Maehata et al. (2012) [35] Retrospective 177/91 3 Median 8.5/14.3% Non-effective p=0.262
    Choi et al. (2014) [53] RCT 439/441 3 Median 2.3/3.9% Non-effective p=0.15
    Seo et al. (2013) [55] Retrospective 61/13 2.3 Mean 9.8/23.1% Non-effective p=0.189, OR=0.36
    Chon et al. (2013) [56] Retrospective 85/44 2.2 Median 4.7/11.4% Effective p=0.008, HR=0.143
    Kwon et al. (2014) [36] Retrospective 214/69 3.4 Median 4.7/14.5% Effective p=0.009
    Kim et al. (2014) [37] Retrospective 49/107 5.3/4.6a) Median 4.1/15.0% Effective p=0.006
    Bae et al. (2014) [57] Retrospective 485/182 5c) Median 7.0/13.2% Effective p=0.02, HR=1.9
    14.7/29.7/1,000 pt yr
    Jung et al. (2015) [58] Retrospective 506/169 3.3c) Median 4.2/5.9% Non-effective p=0.29, HR=0.67
    Mori et al. (2016) [61] Single arm -/594 4.5 Median 29.9/1,000 pt yr
    Table 1. Incidence of Metachronous Gastric Cancer following Endoscopic Resection

    MGC, metachronous gastric cancer; EMR, endoscopic mucosal resection; ESD, endoscopic submucosal dissection.

    Only R0 resection in patients with intramucosal cancer was included.

    Synchronous lesion was included for analysis.

    All patients were followed up for 7 year.

    Table 2. Intervals of Surveillance Endoscopy and Risk Factors of Metachronous Gastric Cancer following Endoscopic Resection

    MGC, metachronous gastric cancer; ESD, endoscopic submucosal dissection; EGC, early gastric cancer.

    Table 3. Incidence of Metachronous Gastric Cancer following Successful Helicobacter pylori Eradication

    NR, non-randomized; RCT, randomized controlled trial; OR, odds ratio; HR, hazard ratio.

    Eradicated group/Persistent infection group.

    Modified intention to treat analysis.

    Including gastric dysplasia, including Helicobacter pylori non-infection group.

    Table 1.

    Table 2.

    Table 3.

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