Role of pre-existing incomplete intestinal metaplasia in gastric adenocarcinoma:A retrospective case series analysis

BACKGROUND Risk stratification for patients with gastric precancerous lesions for endoscopic surveillance remains controversial.AIM To analysis of patients having developed gastric adenocarcinoma during the period of follow-up.METHODS We conducted a retrospective study on patients having undergone upper endoscopy prior to the development of gastric adenocarcinoma. The presence and stage of precancerous lesions as well as subtype of intestinal metaplasia at the baseline endoscopy got evaluated. Literature mini-review was performed.RESULTS Out of 1681 subjects in the Biobank, gastric adenocarcinoma was detected in five cases in whom previous endoscopy data with biopsies either from the corpus or antral part were available. All of the patients had incomplete intestinal metaplasia during the baseline endoscopy;all three subjects in whom intestinal metaplasia subtyping was performed according to Filipe et al, had Type Ⅲ intestinal metaplasia. Two of the five cases had low Operative Link on Gastritis Assessment(OLGA) and Operative Link on Gastritis Intestinal Metaplasia Assessment(OLGIM) stages(Ⅰ-Ⅱ) at the baseline.CONCLUSION The presence of incomplete intestinal metaplasia, in particular, that of Type Ⅲ is a better predictor for gastric adenocarcinoma development than OLGA/OLGIM staging system. Subtyping of intestinal metaplasia have an important role in the risk stratification for surveillance decisions.

Expression of COX-2 in Different Subtypes of Gastric Intestinal Metaplasia and Gastric Carcinoma by Tissue Microarray

Objective: To study the expression of cyclooxygenase-2 (COX-2) protein in different subtypes of intestinal metaplasia (IM) and gastric carcinoma, evaluate the possibility of COX-2 forecasting the risk of malignant potential of IM, and the relationship between COX-2 expression and gastric carcinogenesis. Methods: Forty cases of chronic atrophic gastritis (CAG) with IM, 40 cases of gastric carcinoma and corresponding paracancerous tissues were selected to construct a tissue microarray. High iron diamine/alcian blue (HID/AB) staining and Hematoxylin and Eosin (HE) staining was used to classify IM and gastric carcinoma, and the expression of COX-2 protein detected in different subtypes of IM and gastric cancer by using immunohistochemistry. Results: The positive expression rate of COX-2 was 45.65%, 59.38% and 77.27% in IM foci in CAG, IM foci in paracancerous tissues, and intestinal-type gastric carcinoma, respectively, significantly higher than in diffuse-type gastric cancer (16.67%)(P<0.05, 0.005 and 0.005, respectively), and the expression intensity of COX-2 protein showed a increased tendency gradually in the sequence of IM foci in CAG→IM foci in paracancerous tissues→intestinal-type gastric carcinoma (P<0.005). The positive expression rate of COX-2 protein in type Ⅲ IM was significantly higher than in type Ⅰ and type Ⅱ IM (P<0.005 and 0.05, respectively), and the expression intensity also showed a increased tendency gradually from type Ⅰ to type Ⅲ IM (P<0.005). Conclusion: The expression level of COX-2 was increased gradually along with the increase of the risk of malignancy of IM, and its expression level may be a useful index to forecast the risk of malignant potential of IM. COX-2 expression was associated with intestinal-type gastric carcinoma, but it might also have some role in the carcinogenesis of diffuse-type gastric carcinoma.

Helicobacter pylori plays a key role in gastric adenocarcinoma induced by spasmolytic polypeptide-expressing metaplasia

Heliobacter pylori(H. pylori), a group 1 human gastric carcinogen, is significantly associated with chronic gastritis, gastric mucosal atrophy, and gastric cancer.Approximately 20% of patients infected with H. pylori develop precancerous lesions, among which metaplasia is the most critical. Except for intestinal metaplasia(IM), which is characterized by goblet cells appearing in the stomach glands, one type of mucous cell metaplasia, spasmolytic polypeptide-expressing metaplasia(SPEM), has attracted much attention. Epidemiological and clinicopathological studies suggest that SPEM may be more strongly linked to gastric adenocarcinoma than IM. SPEM, characterized by abnormal expression of trefoil factor 2, mucin 6, and Griffonia simplicifolia lectin II in the deep glands of the stomach, is caused by acute injury or inflammation. Although it is generally believed that the loss of parietal cells alone is a sufficient and direct cause of SPEM, further in-depth studies have revealed the critical role of immunosignals.There is controversy regarding whether SPEM cells originate from the transdifferentiation of mature chief cells or professional progenitors. SPEM plays a functional role in the repair of gastric epithelial injury. However, chronic inflammation and immune responses caused by H. pylori infection can induce further progression of SPEM to IM, dysplasia, and adenocarcinoma. SPEM cells upregulate the expression of whey acidic protein 4-disulfide core domain protein 2 and CD44 variant 9, which recruit M2 macrophages to the wound. Studies have revealed that interleukin-33, the most significantly upregulated cytokine in macrophages, promotes SPEM toward more advanced metaplasia. Overall, more effort is needed to reveal the specific mechanism of SPEM malignant progression driven by H.pylori infection.

Narrow-band imaging with magnifying endoscopy is accurate for detecting gastric intestinal metaplasia

AIM:To investigate the predictive value of narrowband imaging with magnifying endoscopy (NBI-ME) for identifying gastric intestinal metaplasia (GIM) in unselected patients. METHODS:We prospectively evaluated consecutive patients undergoing upper endoscopy for various indications, such as epigastric discomfort/pain, anaemia, gastro-oesophageal reflux disease, suspicion of peptic ulcer disease, or chronic liver diseases. Patients underwent NBI-ME, which was performed by three blinded, experienced endoscopists. In addition, five biopsies (2 antrum, 1 angulus, and 2 corpus) were taken and examined by two pathologists unaware of the endoscopic findings to determine the presence or absence of GIM. The correlation between light blue crest (LBC) appearance and histology was measured. Moreover, we quantified the degree of LBC appearance as less than 20% (+), 20%-80% (++) and more than 80% (+++) of an image field, and the semiquantitative evaluation of LBC appearance was correlated with IM percentage from the histological findings. RESULTS:We enrolled 100 (58 F/42 M) patients who were mainly referred for gastro-esophageal reflux disease/dyspepsia (46%), cancer screening/anaemia (34%), chronic liver disease (9%), and suspected celiac disease (6%); the remaining patients were referred for other indications. The prevalence of Helicobacter pylori (H. pylori ) infection detected from the biopsies was 31%, while 67% of the patients used proton pump inhibitors. LBCs were found in the antrum of 33 patients (33%); 20 of the cases were classified as LBC+, 9 as LBC++, and 4 as LBC+++. LBCs were found in the gastric body of 6 patients (6%), with 5 of them also having LBCs in the antrum. The correlation between the appearance of LBCs and histological GIM was good, with a sensitivity of 80% (95%CI:67-92), a specificity of 96% (95%CI:93-99), a positive predictive value of 84% (95%CI:73-96), a negative predictive value of 95% (95%CI:92-98), and an accuracy of 93% (95%CI:90-97). The NBI-ME examination overlooked GIM in 8 cases, but the GIM was less than 5% in 7 of the cases. Moreover, in the 6 false positive cases, the histological examination showed the presence of reactive gastropathy (4 cases) or H. pylori active chronic gastritis (2 cases). The semiquantitative correlation between the rate of LBC appearance and the percentage of GIM was 79% (P < 0.01). CONCLUSION:NBI-ME achieved good sensitivity and specificity in recognising GIM in an unselected population. In routine clinical practice, this technique can reliably target gastric biopsies.

Helicobacter pylori infection, glandular atrophy and intestinal metaplasia in superficial gastritis, gastric erosion, erosive gastritis, gastric ulcer and early gastric cancer

AIM: To evaluate the histological features of gastric mucosa, including Helicobacter pylori infection in patients with early gastric cancer and endoscopically found superficial gastritis, gastric erosion, erosive gastritis, gastric ulcer. METHODS: The biopsy specimens were taken from the antrum, corpus and upper angulus of all the patients. Giemsa staining, improved toluidine-blue staining, and Hpylori-specific antibody immune staining were performed as appropriate for the histological diagnosis of H pylori infection. Hematoxylin-eosin staining was used for the histological diagnosis of gastric mucosa inflammation, gastric glandular atrophy and intestinal metaplasia and scored into four grades according to the Updated Sydney System. RESULTS: The overall prevalence of H pylori infection in superficial gastritis was 28.7%, in erosive gastritis 57.7%, in gastric erosion 63.3%, in gastric ulcer 80.8%, in early gastric cancer 52.4%. There was significant difference (P<0.05), except for the difference between early gastric cancer and erosive gastritis. H pylori infection rate in antrum, corpus, angulus of patients with superficial gastritis was 25.9%, 26.2%, 25.2%, respectively; in patients with erosive gastritis 46.9%, 53.5%, 49.0%, respectively; in patients with gastric erosion 52.4%, 61.5%, 52.4%, respectively; in patients with gastric ulcer 52.4%, 61.5%, 52.4%, respectively; in patients with early gastric cancer 35.0%, 50.7%, 34.6%, respectively. No significant difference was found among the different site biopsies in superficial gastritis, but in the other diseases the detected rates were higher in corpus biopsy (P<0.05). The grades of mononuclear cell infiltration and polymorphonuclear cell infiltration, in early gastric cancer patients, were significantly higher than that in superficial gastritis patients, lower than that in gastric erosion and gastric ulcer patients (P<0.01); however, there was no significant difference compared with erosive gastritis. The grades of mucosa glandular atrophy and intestinal metaplasia were significantly highest in early gastric cancer, lower in gastric ulcer, the next were erosive gastritis, gastric erosion, the lowest in superficial gastritis (P<0.01). Furthermore, 53.3% and 51.4% showed glandular atrophy and intestinal metaplasia in angular biopsy specimens, respectively; but only 40.3% and 39.9% were identified in antral biopsy, and 14.1% and 13.6% in corpus biopsy; therefore, the angulus was more reliable for the diagnosis of glandular atrophy and intestinal metaplasia compared with antrum and corpus (P<0.01). The positivity rate of glandular atrophy and intestinal metaplasia of superficial gastritis with H pyloripositivity was 50.7%, 34.1%; of erosive gastritis 76.1%, 63.0%; of gastric erosion 84.8%, 87.8%; of gastric ulcer 80.6%, 90.9%; and of early gastric cancer 85.5%, 85.3%, respectively. The positivity rate of glandular atrophy and intestinal metaplasia of superficial gastritis with H pylorinegativity was 9.9%, 6.9%; of erosive gastritis 42.5%, 42.1%; of gastric erosion 51.1%, 61.9%; of gastric ulcer 29.8%, 25.5%; and of early gastric cancer 84.0%, 86.0%, respectively. The positivity rate of glandular atrophy and intestinal metaplasia of superficial gastritis, erosive gastritis, gastric erosion, and gastric ulcer patients with H pylon positivity was significantly higher than those with H pylori negativity (P<0.01); however, there was no significant difference in patients with early gastric cancer with or without H pylori infection. CONCLUSION: The progression of the gastric pre-cancerous lesions, glandular atrophy and intestinal metaplasia in superficial gastritis, gastric erosion, erosive gastritis and gastric ulcer was strongly related to H pylori infection. In depth studies are needed to evaluate whether eradication of H pylori infection will really diminish the risk of gastric cancer.

-765G > C COX-2 polymorphism may be a susceptibility marker for gastric adenocarcinoma in patients with atrophy or intestinal metaplasia

AIM： To investigate the relationship between the -765G 〉 C COX-2 polymorphism and the development of different gastric lesions： atrophy or intestinal metaplasia and gastric adenocarcinoma. METHODS： A cross-sectional study was performed involving 320 Portuguese individuals （210 without evidence of neoplastic disease, 73 patients with gastric adenocarcinomas and 37 with atrophy or intestinal metaplasia） using a PCR-RFLP method.RESULTS： -765C allele was overrepresented in the patients with gastric adenocarcinoma （51%） when compared either with the control group （38%） or patients with atrophy or intestinal metaplasia （27%）. Callele was found to be very common in our population （0.22）, and a multivariate logistic regression analysis revealed nearly 3-fold increased risk for the progression to gastric adenocarcinoma in patients with atrophy or intestinal metaplasia carrying the -765C allele （OR = 2.67, 95% CI = 1.03-6.93; P = 0.04）.CONCLUSION： -765C carrier status should be considered as another susceptibility marker for gastric adenocarcinoma development in patients with atrophy or intestinal metaplasia.

Role of digital chromoendoscopy and confocal laser endomicroscopy for gastric intestinal metaplasia and cancer surveillance

In Japan and countries such as South Korea and Tai-wan, China, the standard technique for detecting earlygastric cancer (EGC) is chromoendoscopy. This technique involves a magnified endoscope and the use ofan indigo-carmine spray to distinguish between EGCand non-EGC areas. However, this technique is notwidely adopted in many parts of the world. One important reason for limited use is that this technique needsan experienced endoscopist to interpret the imagesduring the procedure. In addition, the sensitivity for detecting gastric intestinal metaplasia (GIM), a precancerous lesion of EGC, is graded as suboptimal. Moreover,the requirement of a cumbersome spraying method isinconvenient and needs preparation time. Easier digitalchromoendoscopy techniques, such as Narrow-bandImaging and Flexible spectral Imaging Color Enhancement, have been reported to facilitate targeted GIM and EGC biopsy. They provide higher sensitivities over conventional white light endoscopy. Recently, the noveltechnology of confocal laser endomicroscopy has been introduced as a high-magnification (1000 ×) real-time evaluation for many early gastrointestinal (GI) cancersand precancerous GI lesions, including colonic polyp,Barrett's esophagus, and GIM. The advantage of this technique is that it can be used as an in vivo confirmation of the presence of GIM and EGC during endoscopic surveillance. This review aims to explain the current information on the usefulness of digital chromoendos-copy and confocal laser endomicroscopy for evaluating GIM and EGC during endoscopic surveillance and the possible future role of these techniques for GI cancerscreening programs.

Histochemical studies on intestinal metaplasia adjacent to gastric cardia adenocarcinoma in subjects at high-incidence area in Henan, north China

AIM： To characterize the histochemical type and pattern of intestinal metaplasia （IM） adjacent to gastric cardia adenocarcinoma （GCA） and distal gastric cancer （GC） in Unzhou, Henan Province, China. METHODS： Alcian-blue-periodic acid Schiff and high iron diamine-Alcian blue histochemical methods were performed on 142 cases of IM, including 49 cases of GCA and 93 cases of GC. All the patients were from Linzhou, Henan Province, China, the highest incidence area for both GCA and squamous cell carcinoma. Radio- or chemotherapy was not applied to these patients before surgery. RESULTS： The detection rate of IM in tissues adjacent to GCA tissues was 44.9%, which was significantly lower than that in GC tissues （80.64%, P〈0.01）. The rates of both incomplete small intestinal and colonic IM types identified by histochemistry in GCA tissues （31.82% and 63.64%, respectively） were significantly higher than those in GC （5.33% and 21.33%, respectively, P〈0.01）. CONCLUSION： IM in GCA and GC should be considered as a separate entity. Further research is needed to evaluate whether neoplastic progression of IM is related to its mucin profile in GCA.

Comparison of operative link for gastritis assessment, operative link on gastric intestinal metaplasia assessment, and TAIM stagings among men with atrophic gastritis

BACKGROUND Gastric cancer is the world’s third most lethal malignancy. Most gastric cancers develop through precancerous states of atrophic gastritis and intestinal metaplasia. Two staging systems, operative link for gastritis assessment(OLGA)and operative link on gastric intestinal metaplasia assessment(OLGIM), have been developed to detect high gastric cancer risk. European guidelines recommend surveillance for high-risk OLGA/OLGIM patients(stages Ⅲ–Ⅳ),and for those with advanced stage of atrophic gastritis in the whole stomach mucosa. We hypothesize, that by combining atrophy and intestinal metaplasia into one staging named TAIM, more patients with increased gastric cancer risk could be detected.AIM To evaluate the clinical value of the OLGA, OLGIM, and novel TAIM stagings as prognostic indicators for gastric cancer.METHODS In the Helsinki Gastritis Study, 22346 elderly male smokers from southwestern Finland were screened for serum pepsinogen I(PGI). Between the years 1989 and1993, men with low PGI values(PGI < 25 μg/L), were invited to undergo an oesophagogastroduodenoscopy. In this retrospective cohort study, 1147 men that underwent gastroscopy were followed for gastric cancer for a median of 13.7 years, and a maximum of 27.3 years. We developed a new staging system, TAIM,by combining the topography with the severity of atrophy or intestinal metaplasia in gastric biopsies. In TAIM staging, the gastric cancer risk is classified as low or high.RESULTS Twenty-eight gastric cancers were diagnosed during the follow-up, and the incidence rate was 1.72 per 1000 patient-years. The cancer risk associated positively with TAIM [Hazard ratio(HR) 2.70, 95%CI: 1.09–6.69, P = 0.03]. The risk increased through OLGIM stages 0-Ⅳ(0 vs Ⅳ: HR 5.72, 95%CI: 1.03–31.77, P for trend = 0.004), but not through OLGA stages 0–Ⅳ(0 vs Ⅳ: HR 5.77, 95%CI:0.67–49.77, P for trend = 0.10). The sensitivities of OLGA and OLGIM stages Ⅲ–Ⅳ were low, 21% and 32%, respectively, whereas that of TAIM high-risk was good, 79%. On the contrary, OLGA and OLGIM had high specificity, 85% and81%, respectively, but TAIM showed low specificity, 42%. In all three staging systems, the high-risk men had three-to four-times higher gastric cancer risk compared to the general male population of the same age.CONCLUSION OLGIM and TAIM stagings show prognostic value in assessing gastric cancer risk in elderly male smokers with atrophic gastritis.

Helicobacter pylori associated gastric intestinal metaplasia:Treatment and surveillance

Gastric cancer(GC) is one of the leading causes of cancer related death in the world, particularly in East Asia. According to the Correa's cancer cascade, noncardia GC is usually developed through a series of mucosal changes from non-atrophic gastritis to atrophic gastritis(AG), intestinal metaplasia(IM), dysplasia and adenocarcinoma. Atrophic gastritis and IM are therefore generally considered to be pre-neoplastic gastric lesions. Helicobacter pylori(H. pylori) infection is an important initiating and promoting step of this gastric carcinogenesis cascade. Emerging long-term data showed that eradication of H. pylori reduced the risk of subsequent cancer development. It however remains confusing whether eradication of the bacterium in individuals with pre-neoplastic gastric lesions could regress these changes as well as in preventing cancer. Whilst H. pylori eradication could likely regress AG, the presence of IM may be a point of no return in this cascade. Hence, surveillance by endoscopy may be indicated in those with extensive IM or those with incomplete IM, particularly in populations with high GC risk. The optimal interval and the best tool of surveillance endoscopy remains to be determined in future studies.

Non-sequential narrow band imaging for targeted biopsy and monitoring of gastric intestinal metaplasia

AIM： To evaluate the efficacy of non-sequential narrow band imaging （NBI） for a better recognition of gastric intestinal metaplasia （GIM）. METHODS： Previously diagnosed GIM patients underwent targeted biopsy from areas with and without GIM, as indicated by NBI, twice at an interval of 1 year. The authors compared the endoscopic criteria such as light blue crest （LBC）, villous pattern （VP）, and large long crest （LLC） with standard histology. The results from two surveillance endoscopies were compared with histology results for sensitivity, specificity, positive predic-tive value （PPV）, negative predictive value （NPV）, and likelihood ratio of positive test （LR＋）. The number of early gastric cancer cases detected was also reported. RESULTS： NBI targeted biopsy was performed in 38 and 26 patients during the first and second surveillance endoscopies, respectively. There were 2 early gastric cancers detected in the first endoscopy. No cancer was detected from the second study. Surgical and endoscopic resections were successfully performed in each patient. Sensitivity, specificity, PPV, NPV, and LR＋ of all 3 endoscopic criteria during the first/second surveillances were 78.8%/91.3%, 82.5%/89.1%, 72.8%/77.8%, 86.8%/96.1, and 4.51/8.4, respectively. LBC provided the highest LR＋ over VP and LLC. CONCLUSION： Nonequential NBI is useful for GIM targeted biopsy. LBC provides the most sensitive reading. However, the optimal duration between two surveillances requires further study.

Prevalence of Helicobacter pylori infection and intestinal metaplasia in subjects who had undergone surgery for gastric adenocarcinoma in Northwest Italy

AIM： To investigate the seroprevalence of Helicobacter pylori （Hpylori） infection and its more virulent strains as well as the correlation with the histologic features among patients who had undergone surgery for gastric cancer （GC）. METHODS： Samples from 317 （184 males, 133 females, mean age 69±3.4 years） consecutive patientswho had undergone surgery for gastric non-cardia adenocarcinoma were included in the study. Five hundred and fifty-five （294 males, 261 females, mean age 57.3±4.1 years） patients consecutively admitted to the Emergency Care Unit served as control. Histological examination of tumor, lymph nodes and other tissues obtained at the time of surgery represented the diagnostic ＂gold standard＇： An enzyme immunosorbent assay was used to detect serum anti-H pylori （IgG） antibodies and Western blotting technique was utilized to search for anti-CagA protein （IgG）. RESULTS： Two hundred and sixty-one of three hundred and seventeen （82.3%） GC patients and 314/555 （56.5%） controls were seropositive for anti-H pylori （P〈0.0001; OR, 3.58; 95%CI, 2.53-5.07）. Out of the 317 cases, 267 （84.2%） were seropositive for anti-CagA antibody vs 100 out of 555 （18%） controls （P〈0.0001; OR, 24.30; 95%CI, 16.5-35.9）. There was no difference between the frequency of H pylori in intestinal type carcinoma （76.2%） and diffuse type cancer （78.8%）. Intestinal metaplasia （IM） was more frequent but not significant in the intestinal type cancer （83.4% vs 75.2% in diffuse type and 72.5% in mixed type）. Among the patients examined for IM, 39.8% had IM type Ⅰ, 8.3% type Ⅱ and 51.9% type Ⅲ （type IU vs others, P = 0.4）. CONCLUSION： This study confirms a high seroprevalence of H pylori infection in patients suffering from gastric adenocarcinoma and provides further evidence that searching for CagA status over H pylori infection might confer additional benefit in identifying populations at greater risk for this tumor.

Evaluation of the Gastric Microbiome in Patients with Chronic Superficial Gastritis and Intestinal Metaplasia

Objective To evaluate the gastric microbiome in patients with chronic superficial gastritis(CSG)and intestinal metaplasia(IM)and investigate the influence of Helicobacter pylori(H.pylori)on the gastric microbiome.Methods Gastric mucosa tissue samples were collected from 54 patients with CSG and IM,and the patients were classified into the following four groups based on the state of H.pylori infection and histology:H.pylori-negative CSG(n=24),H.pylori-positive CSG(n=14),H.pylori-negative IM(n=11),and H.pylori-positive IM(n=5).The gastric microbiome was analyzed by 16S rRNA gene sequencing.Results H.pylori strongly influenced the bacterial abundance and diversity regardless of CSG and IM.In H.pylori-positive subjects,the bacterial abundance and diversity were significantly lower than in H.pylori-negative subjects.The H.pylori-negative groups had similar bacterial composition and bacterial abundance.The H.pylori-positive groups also had similar bacterial composition but different bacterial relative abundance.The relative abundance of Neisseria,Streptococcus,Rothia,and Veillonella were richer in the I-HP group than in G-HP group,especially Neisseria(t=175.1,P<0.001).Conclusions The gastric microbial abundance and diversity are lower in H.pylori-infected patients regardless of CSG and IM.Compared to H.pylori-positive CSG group and H.pylori-positive IM,the relative abundance of Neisseria,Streptococcus,Rothia,and Veillonella is higher in H.pylori-positive patients with IM than in H.pylori-positive patients with CSG,especially Neisseria.

Gastric intestinal metaplasia is associated with gastric dysplasia but is inversely correlated with esophageal dysplasia

AIMTo determine which clinical factors might be associated with gastric intestinal metaplasia (IM) in a North American population. METHODSPathology and endoscopy databases at an academic medical center were reviewed to identify patients with and without gastric IM on biopsies for a retrospective cohort study. Patient demographics, insurance status, and other clinical factors were reviewed. RESULTSFour hundred and sixty-eight patients with gastric IM (mean age: 61.0 years ± 14.4 years, 55.5% female) and 171 without gastric IM (mean age: 48.8 years ± 20.8 years, 55.0% female) were compared. The endoscopic appearance of atrophic gastritis correlated with finding gastric IM on histopathology (OR = 2.05, P = 0.051). Gastric IM was associated with histologic findings of chronic gastritis (OR = 2.56, P P = 0.015), gastric dysplasia (OR = 6.11, P = 0.038), and gastric cancer (OR = 6.53, P = 0.027). Histologic findings of Barrett’s esophagus (OR = 0.28, P = 0.003) and esophageal dysplasia (OR = 0.11, P = 0.014) were inversely associated with gastric IM. Tobacco use (OR = 1.73, P = 0.005) was associated with gastric IM. CONCLUSIONPatients who smoke or have the endoscopic finding of atrophic gastritis are more likely to have gastric IM and should have screening gastric biopsies during esophagogastroduodenoscopy (EGD). Patients with gastric IM are at increased risk for having gastric dysplasia and cancer, and surveillance EGD with gastric biopsies in these patients might be reasonable.

Long-term Follow-up Study on Gastric Intestinal Metaplasia Subtype and Its Relation to Expression of P53,Bcl-2 and PCNA

Objective： To investigate the correlation of typies of gastric intestinal metaplasia（IM）, expression of p53, bcl-2 and the proliferating cell nuclear antigen（PCNA）, with the lesion＇s evolution. Methods： A total of 80 patients with IM（53 male and 27 female, 35-64 years old） from an area with high-risk of gastric cancer（GC） in China were enrolled into this prospective study, including 28 cases of type Ⅰ （complete）, 25 cases of type Ⅱ （incomplete） , and 27 cases of type Ⅲ （incomplete）. Of the 80 cases, 62 cases including 19 cases of type Ⅰ, 22 type Ⅱ and 21 type Ⅲ, were followed up for 5-14 years（49 cases for 14 years, 6 for 10 years, and 7 for 5 years）. All of the 80 cases were studied immunohistochemically for the expression of p53, bcl-2 and PCNA. Results： The rate of p53-expressing cases was higher in type Ⅲ（25.9%） than in type Ⅰ（10.7%） and type Ⅱ （12.0%）, but without statistical significance（P=0.3070）. The positive rate of bcl-2 was obviously lower in type Ⅰ （21.4%） and type Ⅱ （24.0%） than in type Ⅲ（37.0%）, but not statistically significant（P=0.4223）. We observed difference in PCNA labelling index （LI） between type Ⅱ and type Ⅲ（P=0.0037）, and the difference was particularly significant in type Ⅰ as compared with type Ⅲ（P〈0.0001）. There was no statistical significance between type I and type II （P=0.0616）. Evolution into GC was detected in 0%, 4.5%, and 14.3% of type Ⅰ, type Ⅱ, and type Ⅲ IM cases, respectively. Progression to dysplasia was detected in 31.6%, 18.2%, and 14.3% of type Ⅰ, type Ⅱ, and type Ⅲ IM cases, respectively. Persistence of IM was documented in 31.6%, 45.5%, and 42.9% of type Ⅰ, type Ⅱ, and type Ⅲ IM cases, respectively. Regression of IM was documented in 36.8%, 31.8%, and 28.6% of type Ⅰ, type Ⅱ, and type ⅢIM cases, respectively. In progressive, persistent and regressive groups, the positive rates of p53 were 17.6%, 16.0% and 15.0%, bcl-2 were 29.4%, 36.0% and 25.0%, and PCNA LIs were 24.953±14.477, 23.752±12.934 and 25.105±10.055, respectively. There were no significant differences between the groups. Conclusion： The present follow-up study indicated that type Ⅲ had a higher risk for development of cancer than type Ⅰ or Ⅱ. PCNA LI was significantly higher in type Ⅲthan in type Ⅰ and Ⅱ, suggesting that cell proliferation in type Ⅲwas more active. Our data also indicated that the expression of p53 and bcl-2 had no apparent association with the particular type and the expression of p53, bcl-2 and PCNA had no apparent correlation with evolution of IM. Further studies with a larger sample size are needed to verify present observation.

Comparison of white-light endoscopy,optical-enhanced and aceticacid magnifying endoscopy for detecting gastric intestinal metaplasia:A randomized trial

BACKGROUND Gastric intestinal metaplasia(GIM)is a precancerous lesion of the stomach,which severely affects human life and health.Currently,a variety of endoscopic techniques are used to screen/evaluate GIM.Traditional white-light endoscopy(WLE)and acetic-acid chromoendoscopy combined with magnifying endoscopy(MEAAC)are the interventions of choice due to their diagnostic efficacy for GIM.Optical-enhanced magnifying endoscopy(ME-OE)is a new virtual chromoendoscopy technique to identify GIM,which combines bandwidth-limited light and image enhancement processing technology to enhance the detection of mucosal and vascular details.We hypothesized that ME-OE is superior to WLE and MEAAC in the evaluation of GIM.AIM To directly compare the diagnostic value of WLE,ME-AAC,and ME-OE for detection of GIM.METHODS A total of 156 patients were subjected to consecutive upper gastrointestinal endoscopy examinations using WLE,ME-AAC,and ME-OE.Histopathological findings were utilized as the reference standard.Accuracy,sensitivity,specificity,and positive and negative predictive values of the three endoscopy methods in the diagnosis of GIM were evaluated.Moreover,the time to diagnosis with MEAAC and ME-OE was analyzed.Two experts and two non-experts evaluated the GIM images diagnosed using ME-OE,and diagnostic accuracy and intra-and inter-observer agreement were analyzed.RESULTS GIM was detected in 68 of 156 patients(43.6%).The accuracy of ME-OE was highest(91.7%),followed by ME-AAC(86.5%),while that of WLE(51.9%)was lowest.Per-site analysis showed that the overall diagnostic accuracy of ME-OE was higher than that of ME-AAC(P=0.011)and WLE(P<0.001).The average diagnosis time was lower in ME-OE than in ME-AAC(64±7 s vs 151±30 s,P<0.001).Finally,the inter-observer agreement was strong for both experts(k=0.862)and non-experts(k=0.800).The internal consistency was strong for experts(k=0.713,k=0.724)and moderate for non-experts(k=0.667,k=0.598).CONCLUSION For endoscopists,especially experienced endoscopists,ME-OE is an efficient,convenient,and time-saving endoscopic technique that should be used for the diagnosis of GIM.

Gastric intestinal metaplasia development in African American predominant United States population

BACKGROUND Gastric cancer significantly contributes to cancer mortality globally.Gastric intestinal metaplasia(GIM)is a stage in the Correa cascade and a premalignant lesion of gastric cancer.The natural history of GIM formation and progression over time is not fully understood.Currently,there are no clear guidelines on GIM surveillance or management in the United States.AIM To investigate factors associated with GIM development over time in African American-predominant study population.METHODS This is a retrospective longitudinal study in a single tertiary hospital in Washington DC.We retrieved upper esophagogastroduodenoscopies(EGDs)with gastric biopsies from the pathology department database from January 2015 to December 2020.Patients included in the study had undergone two or more EGDswith gastric biopsy.Patients with no GIM at baseline were followed up until they developed GIM or until the last available EGD.Exclusion criteria consisted of patients age<18,pregnancy,previous diagnosis of gastric cancer,and missing data including pathology results or endoscopy reports.The study population was divided into two groups based on GIM status.Univariate and multivariate Cox regression was used to estimate the hazard induced by patient demographics,EGD findings,and Helicobacter pylori(H.pylori)status on the GIM status.RESULTS Of 2375 patients who had at least 1 EGD with gastric biopsy,579 patients were included in the study.138 patients developed GIM during the study follow-up period of 1087 d on average,compared to 857 d in patients without GIM(P=0.247).The average age of GIM group was 64 years compared to 56 years in the non-GIM group(P<0.001).In the GIM group,adding one year to the age increases the risk for GIM formation by 4%(P<0.001).Over time,African Americans,Hispanic,and other ethnicities/races had an increased risk of GIM compared to Caucasians with a hazard ratio(HR)of 2.12(1.16,3.87),2.79(1.09,7.13),and 3.19(1.5,6.76)respectively.No gender difference was observed between the study populations.Gastritis was associated with an increased risk for GIM development with an HR of 1.62(1.07,2.44).On the other hand,H.pylori infection did not increase the risk for GIM.CONCLUSION An increase in age and non-Caucasian race/ethnicity are associated with an increased risk of GIM formation.The effect of H.pylori on GIM is limited in low prevalence areas.

Confocal laser endomicroscopy as a new diagnostic tool for poorly differentiated gastric adenocarcinoma

Gastric cancer(GC)is a multifactorial disease,where both environmental and genetic features can have an impact on its occurrence and development.GC represents one of the leading causes of cancer-related deaths worldwide.GC is most frequent in males and is believed to arise from a series of premalignant lesions.The detection of GC at an early stage is crucial because early GC,which is an invasive stomach cancer confined to the mucosal or submucosal lining,may be curable with a reported 5-year survival rate of more than 90%.Advanced GC usually has a poor prognosis despite current treatment standards.The diagnostic efficacy of conventional endoscopy(with light endoscopy)is currently limited.Confocal laser endomicroscopy is a novel imaging technique that allows real-time in vivo histological examination of mucosal surfaces during endoscopy.Confocal laser endomicroscopy may be of great importance in the surveillance of precancerous gastric lesions and in the diagnosis of GC.In this editorial we commented on the article about this topic published by Lou et al in the recent issue of the World Journal of Clinical Cases.

Microsatellite Instability in Intestinal Metaplasia and Gastric Cancer

Objective: To investigate the changeable patterns of microsatellite instability(MSI)in intestinal metaplasia(IM)and gastric cancer(GC)and the role of MSI in gastric carcinogenesis. Methods: Silver staining single strand conformation polymorphism-polymeriase chain reaction(PCR-SSCP)was used to screen MSI markers at 5 loci in formalin-fixed,paraffin-embedded tissues of GC(n=30),IM(n=40)and corresponding normal gastric tissues. Results: The abnormal shifting of the single-strand DNA was identified in 7(23.3%)out of GC and in 8(20%)out of IM samples.Three(10%)tumors and one(2.5%)IM displayed high-frequency MSI(two or more loci altered).Low-frequency MSI(one loci altered)was detected in 4(13.3%)of the tumors and in 7(17.5%)IM samples.GC with MSI was associated with distal location of the tumors but age,sex,differentiation,lymph nodes metastasis and TNM stage(P=0.044).MSI was more likely detected in moderate-grade IM than in mild-grade IM tissues(34.8% versus 0; P=0.013); and MSI had a tendency to be easily detected in female with IM. Conclusion: The progressive accumulation of MSI in areas of IM may contribute to GC development,representing an important molecular event in the multistep gastric carcinogenesis.

Gastric Atrophy, Intestinal Metaplasia in Helicobacter pylori Gastritis: Prevalence and Predictors Factors

Gastric atrophy and intestinal metaplasia represent the most important premalignant lesions in gastric carcinogenesis. The severity of gastric mucosal inflammation depends on the bacterium Helicobacter pylori (HP), on the host and on environmental factors. The aim of our study is to determine the prevalence and factors associated with Gastric atrophy and intestinal metaplasia in patients infected with Helicobacter pylori. Methods: This is a prospective study over a period of 4 years (May 2009 - January 2015) conducted in the service of Hepatology and Gastroenterology in hospital university Hassan II of Fez in collaboration with microbiology and molecular biology laboratory and epidemiology service of Faculty of Medicine and Pharmacy Fes. We included in our study all patients aged over 15 years, having ulcerative dyspepsia, peptic ulcer disease, gastritis or esophagitis. Results: During the study period, 1190 patients were included of which 70% had HP infection (N = 833). The average age was 48.21 years [16 - 99 years], sex ratio M/F was 1, 11. 60% of patients were older than 45 years. Chronic smoking was found in 12% of patients. Gastric atrophy was observed in 84% (N = 699) of patients infected with HP. Gastric atrophy was localized in 70% in the antrum and 30% in the fundus and 24% in both. The activity of gastritis (p = 0.0001) and the density of the HP (p = 0.005) were factors associated with atrophy. Intestinal metaplasia was observed in 13.5% of patients (N = 112). The density of HP (p = 0.037) and severe atrophy (p = 0.001) were factors associated with metaplasia. Other factors studied: age, sex, smoking, CagA+ genotype were not associated with either gastric atrophy or intestinal metaplasia. Conclusion: In our study, the prevalence of atrophic gastritis and intestinal metaplasia in patients infected with Helicobacter pylori was 84% and 13.5% respectively, which was a high prevalence. The activity of gastritis, and density of HP were factors associated with atrophy. The density of HP and severe atrophy were factors associated with metaplasia.