Comparison between different first-line therapy protocols in eradicating Helicobacter pylori in a region with high clarithromycin resistance

Introduction

Helicobacter pylori (H. pylorii) is a microorganism that is estimated to cause infection in more than 50% of the world population despite its varying prevalence among geographical regions, and thereby it is responsible for significant morbidity and mortality [1]. Helicobacter pylori is associated with active chronic gastritis, peptic ulcer disease, gastric cancer, and gastric mucosa-associated lymphoid tissue lymphoma and is reported to enhance the risk of developing ulceration and gastric bleeding in individuals using non-steroidal anti-inflammatory drugs (NSAIDs) [1]. Nearly 5% of the total annual cancer cases worldwide have been attributed to H. pylorii [2].
Urea breath test and endoscopy with biopsy are the major diagnostic tools used to detect H. pylorii infection [1]. Various combinations of antibiotics are used as eradication treatment. The most common therapeutic recommendations include 1-week triple therapy with proton pump inhibitor (PPI), amoxicillin, and clarithromycin. There are second-line therapies recommended in case the first-line therapy fails. The presence of pre-treatment antimicrobial resistance, nonadherence to treatment, and smoking have been reported among the factors contributing to treatment failure [1].
It has been emphasised that response to the first-line standard treatment of H. pylorii infection has decreased in recent years. While the eradication rate was over 90% in the beginning, it has been reduced to below 70% in time [3]; one of the reasons for this is the resistance to antibiotics, particularly to clarithromycin. A high rate of clarithromycin resistance is encountered among H. pylorii strains in some regions because clarithromycin is a drug commonly used for the treatment of other infections [1, 3]. The reported prevalence of clarithromycin resistance in H. pylorii ranges from 12.5% to 76.2% in different regions of the world [4–8].
In a study from Turkey, which screened the population via urea breath test, the prevalence of H. pylorii infection was found to be as high as 82.5% [9]. In the studies, the rates of clarithromycin resistance in Turkey have been reported to be 36.7% [10], 47.5% [11], and 48.2% [12].

Aim

The aim of the present study was to identify an efficient eradication protocol for patients infected with H. pylorii and to suggest an alternative first-line therapy, particularly in countries with high clarithromycin resistance, such as Turkey. In addition, it was aimed to investigate the factors that may have an effect on eradication.

Material and methods

Patients

Patients aged between 18 and 75 years, who presented with dyspeptic complaints in a 1-year period and in whom H. pylorii was determined by gastric biopsy, were enrolled in the present study in three centres in Ankara. Patients with gastric or duodenal ulcer, those with chronic liver/kidney disease or history of malignancy, those having previous treatment for H. pylorii infection, and those with a history of PPI, histamine-2 (H2) receptor antagonist, or antibiotic use within the last four weeks were excluded. The present study was approved by the Ethics Committee of Dışkapı Yıldırım Beyazıt Training and Research Hospital.

Procedures

Gastric biopsy was taken from the gastric antrum and corpus of the patients during endoscopic examination of the upper gastrointestinal system. The patients were diagnosed with H. pylorii infection based on histopathological examination, and histopathological grading was performed.
The patients infected with H. pylorii were randomised to three groups, and each group received different sequential eradication therapy. The treatment schedule of the study groups is presented in Table I. Eradication was evaluated via carbon 14-labeled urea breath test (14C-UBT) performed 6 weeks after the completion of treatment.
Factors (age, gender, body mass index, alcohol consumption, smoking, non-steroidal anti-inflammatory drug use, localisation of H. pylorii, H. pylorii load, severity of inflammation, degree of activation, and presence of atrophy and intestinal metaplasia) that might have an effect on eradication were assessed.

Histopathological examination

Helicobacter pylori load, severity of inflammation, and degree of activation were graded by the modified Sydney classification [13] using visual analogue scales as follows: 0, normal; 1+, mild; 2+, moderate; and 3+, marked. Moreover, presences of atrophy and intestinal metaplasia were also recorded.

Statistical analysis

Data analyses were performed using PASW Statistics for Windows version 18.0 (SPSS Inc., Chicago, IL, USA). Descriptive statistics were expressed as mean, standard deviation, median, minimum, and maximum for numerical variables. Normal distribution of variables was analysed using visual (histogram and probability graphics) and analytical methods (Kolmogorov-Smirnov/Shapiro-Wilk test). Two- and multiple-group comparisons between categorical variables were performed by 2 test or by Fisher’s exact test. 2 test with Bonferroni correction was used for subgroup comparisons. Multiple independent group comparisons were performed using analysis of variance (ANOVA) test for normally distributed numerical variables and using Kruskal-Wallis test for non-normally distributed numerical variables. Comparison of numerical variables between two independent groups was performed using t-test for normally distributed variables and using Mann-Whitney U test for non-normally distributed variables. The level of significance was determined as p < 0.05.

Results

The present study included 166 patients (mean age: 40 ±12 years) with H. pylorii infection. Of the patients, 68.7% were female, 27.1% were smokers, and 33.7% had a history of NSAID use. The general characteristics of the patients are shown in Table II.
Of the H. pylorii infections, 144 were in the antrum and 138 were in the corpus. The characteristics according to the localisations (antrum and corpus) are shown in Table III.
Among the patients, 50 (30.1%) were in the LAM-B group, 59 (35.5%) were in the LAM-T group, and 57 (34.3%) were in the LAM-BT group. The general characteristics of the treatment groups are shown in Table IV. The treatment groups were similar in terms of demographic and lesion characteristics. The rate of patients receiving NSAIDs was the lowest in the LAM-BT group. Eradication rates were over 80% and similar in each group. Although statistically not significant, the LAM-BT group had the highest clinical eradication rate at 93%. The rate of adverse events was the highest in the LAM-T group, and no adverse event was observed in the LAM-B group.
Helicobacter pylori eradication was achieved in 143 (86.1%) patients. The characteristics of the patients with and without eradication of H. pylorii were compared (Table V). No significant difference was determined between the groups in terms of demographic or histopathological features.

Discussions

In recent years the eradication rate of H. pylorii infection has been gradually decreasing with standard first-line triple therapy [14]. Although an eradication rate of over 90% is still being achieved with seven-day triple therapy options for H. pylorii infection in regions with low antibiotic resistance, [15] the eradication rate has been reduced to below 80% in regions with the problem of antibiotic resistance [14]. Alternative methods of first-line therapy such as increasing drug dose [16], prolonging treatment period [17], sequential administration of drugs [18], or using different drug combinations [19–21] have emerged to achieve a successful eradication.
In a systematic review with meta-analysis in which studies on first-line therapy in eradicating H. pylorii infection were evaluated, 14-day sequential treatment, but not 10-day treatment, was concluded to be more effective as compared with triple therapy given for 14 days as first-line treatment [22]. Liou et al. [23] determined the eradication rate of H. pylorii to be 90.4% with bismuth-based first-line quadruple therapy (300 mg of bismuth tripotassium dicitrate four times a day, 30 mg of lansoprazole two times a day, 500 mg of tetracycline four times a day, and 500 mg of metronidazole three times a day). The rate of adverse events with that treatment modality was 67%, and the rate of adverse events causing drug discontinuation was 10%. Uygun et al. [24] reported the eradication rate to be 82.3% with the same treatment modality. Alboraie et al. [25] compared the first-line treatment modality of 10-day triple therapy containing omeprazole, amoxicillin, and clarithromycin with 10-day quadruple therapy containing omeprazole, bismuth, tetracycline, and metronidazole. They found a higher eradication rate with bismuth-based quadruple therapy as compared to clarithromycin-based triple therapy (88% vs. 68.6%). In light of the above-mentioned information, we also achieved an eradication rate of over 80% by implementing bismuth-based (without clarithromycin) treatment regimens sequentially for 14 days. All treatment groups were similar in terms of demographical, clinical, and histopathological features. Although the eradication rate showed no significant difference among the three groups, the highest eradication rate was clinically observed in the LAM-BT group, at 93%. The rate of adverse events was the highest in the LAM-T group (10.2%). Comparison of the characteristics of patients with and without eradication of H. pylorii revealed no difference in terms of demographical, clinical, or histopathological features.
There are numerous factors that influence treatment for H. pylorii eradication. In addition to antibiotic resistance, these factors include personal, genetic, and environmental factors [14]. While some studies have reported gender difference for response to the eradication therapy [25, 26], some have found no difference [27]. In the present study, the eradication rates were not different between males and females. Smoking has also been reported as one of the factors unfavourably influencing eradication [26, 28]. In the present study, the rate of smoking was similar in the patient groups with and without successful eradication.
In gastroduodenal pathology, there is a complex relation between H. pylorii infection and NSAIDs. Both H. pylorii infection and nonselective use of NSAIDs have been reported as independent risk factors for peptic ulcer development and ulcer bleeding. These factors probably show additive or synergistic effect, as well [29, 30]. Therefore, clinicians want to test the presence of H. pylorii and to treat it if present, to reduce development and complications of ulcers in individuals receiving NSAIDs [30]. In the present study, 33.7% of the patients were using NSAIDs. The rate of NSAID use was the lowest (24.6%) in the LAM-BT group, in which the eradication rate was 93%. Nevertheless, no significant difference was found between the groups with and without successful eradication in terms of NSAID use.
In their study, Onal et al. [31] investigated the effect of H. pylorii density, which was determined by histological grading, on the success of eradication therapy and reported that H. pylorii density negatively affected triple therapy (lansoprazole, clarithromycin, amoxicillin) but not quadruple therapy (colloidal bismuth subcitrate, lansoprazole, tetracycline, metronidazole). Shah et al. [32] determined a correlation between H. pylorii density and complications such as duodenal ulcer, reflux esophagitis, and antral erosions and found a significantly lower eradication rate in the patients with higher H. pylorii density. In the present study, no significant difference was determined between the patients with and without eradication in terms of graded histopathological features, including H. pylorii density.

Conclusions

Based on the knowledge that clarithromycin resistance is high in Turkey, the present study tested the combination regimens without clarithromycin as the first-line therapy and achieved an eradication rate of over 80% in all treatment groups with an eradication rate of 93% achieved in the LAM-BT group. Knowing and monitoring the rates of regional antibiotic resistance, which is among the factors that influence eradication, are important to overcome this problem for successful treatment of H. pylorii infections.

Conflict of interest

The authors declare no conflict of interest.

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Received: 3.12.2017
Accepted: 20.12.2017