Barnacles Mating Optimizer Algorithm to Extract the Parameters of the Photovoltaic Cells and Panels.

The goal of this research is to accurately extract the parameters of the photovoltaic cells and panels and to reduce the extracting time. To this purpose, the barnacles mating optimizer algorithm is proposed for the first time to extract the parameters. To prove that the algorithm succeeds in terms of accuracy and quickness, it is applied to the following photovoltaic cells: monocrystalline silicon, amorphous silicon, RTC France, and the PWP201, Sharp ND-R250A5, and Kyocera KC200GT photovoltaic panels. The mathematical models used are single and double diodes. Datasets for these photovoltaic cells and panels were used, and the results obtained for the parameters were compared with the ones obtained using other published methods and algorithms. Six statistical tests were used to analyze the performance of the barnacles mating optimizer algorithm: the root mean square error mean, absolute percentage error, mean square error, mean absolute error, mean bias error, and mean relative error. The results of the statistical tests show that the barnacles mating optimizer algorithm outperforms several algorithms. The tests about the computational time were made using two computer configurations. Using the barnacles mating optimizer algorithm, the computational time decreases more than 30 times in comparison with one of the best algorithms, hybrid successive discretization algorithm.

Intercellular adhesion molecule-1 (ICAM-1) associates with 24-hour ambulatory blood pressure variability in type 2 diabetes and controls.

BACKGROUND AND AIM: Endothelial dysfunction is a common feature in hypertension and type 2 diabetes. Whether blood pressure (BP) variability is influencing serum intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1) remains to be clarified. We aimed to assess the association between the circulating adhesion molecules and ambulatory blood pressure variability in patients with type 2 diabetes and controls. PATIENTS AND METHODS: The study included data from type 2 diabetes with controlled BP (n = 55), type 2 diabetes with uncontrolled BP (n = 55) and control subjects (n = 28). ICAM-1 and VCAM-1 were measured with specific enzyme-linked immunosorbent assay method. BP variability was assessed using standard deviation of mean systolic and diastolic BP evaluated during 24-hour ambulatory BP monitoring. RESULTS: The uncontrolled BP type 2 diabetes group had significantly higher serum ICAM-1 and VCAM-1 levels compared to controlled BP type 2 diabetes and control groups. In linear regression analysis, after adjustment, higher ICAM-1 was consistently associated with higher daytime and 24-hour diastolic BP variability, and daytime systolic BP variability in the study population. VCAM-1 was associated only with daytime systolic BP variability. CONCLUSIONS: Our study evaluating the association of serum ICAM-1 and VCAM-1 with 24-hour ambulatory BP variability in patients with type 2 diabetes and controls might offer better understanding of the mechanisms generating endothelial dysfunction. Elevated 24-hour ambulatory BP variability might induce endothelial activation by increasing circulating adhesion molecules levels.

The Role of PDGFs and PDGFRs in Colorectal Cancer.

Introduction. Colorectal cancer (CRC) is an important cause of morbidity and mortality worldwide. Angiogenesis was reported as one important mechanism activated in colorectal carcinogenesis. Tumor microenvironment associated angiogenesis involves a large spectrum of signaling molecules and deciphering their role in colorectal carcinogenesis still represents a major challenge. The aim of our study is to point out the diagnosis and prediction role of PDGF family and their receptors in colorectal carcinogenesis. Material and Methods. A systematic search in Medline and PubMed for studies reporting the role of platelet-derived growth factors (PDGFs) and their receptors (PDGFRs) in tumor biology related to CRC was made. Results. PDGFs are important growth factors for normal tissue growth and division, with an important role in blood vessel formation. PDGFs/PDGFRs signaling pathway has been demonstrated to be involved in angiogenesis mainly by targeting pericytes and vascular smooth muscle cells. High levels of PDGF-BB were reported in CRC patients compared to those with adenomas, while elevated levels of PDGFR α/ß in the stroma of CRC patients were correlated with invasion and metastasis. Moreover, PDGF-AB and PDGF-C were correlated with early diagnosis, cancer grading, and metastatic disease. Conclusions. Both PDGFs and PDGFRs families play an important role in colorectal carcinogenesis and could be considered to be investigated as useful biomarkers both for diagnosis and treatment of CRC.

Beneficial Effects of Silymarin After the Discontinuation of CCl4-Induced Liver Fibrosis.

Silymarin (Si) is a herbal product with hepatoprotective potential, well-known for its antioxidant, anti-inflammatory, and immunomodulatory properties. We have recently demonstrated that the usual therapeutic doses of Si are capable of inhibiting the progression of incipient liver fibrosis. We aimed at further investigating the benefits of Si administration upon liver alterations after the hepatotoxin discontinuation, using CCl4 to induce liver injuries on rats. CCl4 administration induces first of all oxidative stress, but other mechanisms, such as inflammation and liver fibrosis are also triggered. Fifty Wistar rats were randomly divided into five groups (n = 10). The control group received sunflower oil twice a week for 8 weeks. Carboxymethyl cellulose group received sunflower oil twice a week, for 8 weeks and CMC daily, for the next 2 weeks. CCl4 group received CCl4 in sunflower oil, by gavage, twice a week, for 8 weeks. CCl4 + Si 50 group received CCl4 twice a week, for 8 weeks, and then 50 mg/body weight (b.w.) Silymarin for the next 2 weeks. CCl4 + Si 200 group was similar to the previous group, but with Si 200 mg/b.w. Ten weeks after the experiment had begun, we assessed inflammation (IL-6, MAPK, NF-κB, pNF-κB), fibrosis (hyaluronic acid), TGF-ß1, MMP-9, markers of hepatic stellate cell activation (α-SMA expression), and proliferative capacity (proliferating cell nuclear antigen). Our data showed that Silymarin administered after the toxic liver injury is capable of reducing inflammation and liver fibrosis. The benefits were more important for the higher dose than for the usual therapeutic dose.

The role of complement system in adipose tissue-related inflammation.

As the common factor linking adipose tissue to the metabolic context of obesity, insulin resistance and atherosclerosis are associated with a low-grade chronic inflammatory status, to which the complement system is an important contributor. Adipose tissue synthesizes complement proteins and is a target of complement activation. C3a-desArg/acylation-stimulating protein stimulates lipogenesis and affects lipid metabolism. The C3a receptor and C5aR are involved in the development of adipocytes' insulin resistance through macrophage infiltration and the activation of adipose tissue. The terminal complement pathway has been found to be instrumental in promoting hyperglycemia-associated tissue damage, which is characteristic of the major vascular complications of diabetes mellitus and diabetic ketoacidosis. As a mediator of the effects of the terminal complement complex C5b-9, RGC-32 has an impact on energy expenditure as well as lipid and glucose metabolic homeostasis. All of this evidence, taken together, indicates an important role for complement activation in metabolic diseases.

The role of complement activation in atherogenesis: the first 40 years.

The pathogenesis of atherosclerotic inflammation is a multi-step process defined by the interweaving of excess modified lipid particles, monocyte-macrophages populations, and innate immune and adaptive immunity effectors. A part of innate immunity, the complement system, is an important player in the induction and progression of atherosclerosis. The accumulation of either oxidized or enzymatically modified LDL-bound to C-reactive protein or not-prompts complement activation leading to the assembly of the terminal complement C5b-9 complex in the atherosclerotic lesion. The sublytic C5b-9 assembly leads to the activation and proliferation of smooth muscle and endothelial cells, accompanied by the release of various chemotactic, pro-adhesion, and procoagulant cytokines from these cells. Response gene to complement (RGC)-32, an essential effector of the terminal complement complex C5b-9, also affects atherogenesis, propelling vascular smooth muscle cell proliferation and migration, stimulating endothelial proliferation, and promoting vascular lesion formation. A substantial amount of experimental work has suggested a role for the complement system activation during atherosclerotic plaque formation, with the proximal classical complement pathway seemingly having a protective effect and terminal complement contributing to accelerated atherogenesis. All these data suggest that complement plays an important role in atherogenesis.

Is there a correlation between peripheral blood expression of angiogenic transcriptional factors/receptors and colorectal cancer?

PURPOSE: The aim of this study was to evaluate whether there is a correlation between peripheral blood expression of angiogenic transcriptional factors/receptors and colorectal cancer (CRC). METHODS: Eighty six blood samples collected from patients with CRC (N=42), adenomas and/or hyperplastic polyps(AP, N=30) and individuals without colon pathology (control group/CTR, N=14) were used for this study. Twelve transcription factors and receptors were assessed by qRT-PCR in a case-control study. The molecules with a minimum of 30% differences in gene expression for CRC and AP compared to CTR were then analyzed separately for each sample. Gene expression was evaluated relatively to the CTR after normalization to the large ribosomal protein PO (RPLPO) housekeeping gene, and the differential expression between studied groups was assessed by ANOVA. RESULTS: Seven out of 12 genes presented differences in expression between 10-29% in CRC and/or AP compared to CTR. Considering the selection criteria, we further individually evaluated the levels of expression of 5 genes that had a minimum of 30% expression in the case-control study. Our data showed a significant up-regulation of platelet derived growth factor (PDGF) C in the blood of the patients with CRC compared to CTR (p=0.007). Likewise, clusterin (CLU) was significantly up-regulated both in CRC and AP groups compared to healthy subjects (p=0.01). For VEGFR1, PDGFRA and TGFB1 we didn't find significantly differential expression between any of the studied groups, even if increased levels were observed in both CRC and AP vs CTR. CONCLUSIONS: The results of our study indicated that increased blood level of PDGFC mRNA was associated with the presence of CRC (p=0.007). Additionally, high levels of circulating CLU mRNA were observed in both malignant and benign colorectal pathologies.

Fluorophores advanced glycation end products (AGEs)-to-NADH ratio is predictor for diabetic chronic kidney and cardiovascular disease.

AIMS: An imbalance in advanced glycation end products (AGEs) and NADH formation has been associated with diabetic chronic kidney disease (CKD) and cardiovascular disease (CVD). No data have been reported on simultaneous measurement of AGEs and NADH in type 2 diabetes (T2DM) patients. We aimed to compare AGEs, NADH and the AGEs-to-NADH ratio in T2DM and controls, and to assess its relationship with diabetic CKD and CVD. MATERIAL AND METHODS: In this cross-sectional study, we measured serum AGEs (370/435nm) and NADH (370/460nm) in T2DM patients (n=63) and controls (n=25) using fluorescence spectroscopy. The AGEs-to-NADH ratio was analyzed according to diabetic CKD and CVD. RESULTS: We found significantly higher AGEs-to-NADH ratio in T2DM compared to controls. The AGEs-to-NADH ratio was significantly associated with triglycerides, blood glucose, HDL-cholesterol, estimated glomerular filtration rate. The AGEs-to-NADH ratio was a significant predictor for the presence of diabetic CKD and CVD when using ROC curves. Multivariate analysis showed that triglycerides and the presence of T2DM were predictors for the AGEs-to-NADH ratio. CONCLUSIONS: These findings suggest that the fluorophores AGEs-to-NADH ratio could be a new biomarker for the presence of diabetic CKD and CVD.

Can we change our microbiome to prevent colorectal cancer development?

BACKGROUND: Colorectal cancer represents an important disease as one of the major causes of death worldwide. Although a lot of genetic and epigenetic research has been conducted, all the pieces of the puzzle of colorectal cancer carcinogenesis have not yet been identified. New recent data has highlighted that gut microbiota could have an influence on colorectal carcinogenesis. Gut microbiota represents the microbe population living in the human intestine and contains tens of trillions of microorganisms. MATERIAL AND METHODS: A systematic search in Medline and PubMed for studies reporting the influence of gut microbiota and inflammation on patients with colorectal cancer was made. RESULTS: In this review we discuss many of the specific bacteria, as well as their metabolites which may have an important role in development of colorectal cancer. Furthermore, we emphasize the molecular mechanisms modulated by gut microbiota, which promote inflammation, toxic metabolites, DNA damaging and pro-carcinogenic compounds, as support for colorectal carcinogenesis. The interrelation between microbiota and inflammation is complex because bacteria and inflammation could mutually impact upon each other. In this context, both endogenous and exogenous miRNAs may have an important role to modulate tumor-related inflammation in colorectal cancer. CONCLUSIONS: Better understanding of the role of gut microbiota in colorectal carcinogenesis could provide promising new directions to improve both prevention and treatment of colorectal cancer. Moreover, the discovery of novel biomarkers in the gut microbiome in order to detect colorectal cancer in an early stage or even in a precancerous stage is of outmost importance.

Silymarin inhibits the progression of fibrosis in the early stages of liver injury in CCl4-treated rats.

Liver fibrosis, a common condition occurring during the evolution of almost all chronic liver diseases, is the consequence of hepatocyte injury that leads to the activation of Kupffer cells and hepatic stellate cells (HSC). Silymarin (Si) is a herbal product widely used for its hepatoprotective potential. Our study aims to investigate the effects of two different doses of Silymarin on a CCl4-induced model of liver fibrosis with a focus on the early stages of liver injury. Fifty Wistar rats were randomly divided into five groups (n=10): control group (sunflower oil twice a week); CMC group (carboxymethyl cellulose five times a week, sunflower oil twice a week); CCl4 group (CCl4 in sunflower oil, by gavage, twice a week); CCl4+Si 50 group (CCl4 twice a week, Silymarin 50 mg/b.w. in CMC five times a week); and CCl4+Si 200 group (similar to the previous group, with Si 200 mg/b.w.). One month after the experiment began we explored hepato-cytolysis (aminotransferases and lactate dehydrogenase), oxidative stress, fibrosis (histological score, hyaluronic acid), markers of HSC activation (transforming growth factor ß1 [TGF-ß1], and α-smooth muscle actin [α-SMA] expression by western blot) and activation of Kupffer cells by immunohistochemistry. Our data showed that Si 50 mg/b.w. had the capacity of reducing oxidative stress, hepato-cytolysis, fibrosis, activation of Kupffer cells, and the expression of α-SMA and TGF-ß1 with better results than Si 200 mg/b.w. Thus, the usual therapeutic dose of Silymarin, administered in the early stages of fibrotic changes is capable of inhibiting the fibrogenetic mechanism and the progression of initial liver fibrosis.

Role of C5b-9 complement complex and response gene to complement-32 (RGC-32) in cancer.

Complement system activation plays an important role in both innate and acquired immunity, with the activation of complement and the subsequent formation of C5b-9 terminal complement complex on cell membranes inducing target cell death. Recognition of this role for C5b-9 leads to the assumption that C5b-9 might play an antitumor role. However, sublytic C5b-9 induces cell cycle progression by activating signal transduction pathways and transcription factors in cancer cells, indicating a role in tumor promotion for this complement complex. The induction of the cell cycle by C5b-9 is dependent upon the activation of the phosphatidylinositol 3-kinase (PI3K)/Akt/FOXO1 and ERK1 pathways in a Gi protein-dependent manner. C5b-9 also induces response gene to complement (RGC)-32, a gene that plays a role in cell cycle promotion through activation of Akt and the CDC2 kinase. RGC-32 is expressed by tumor cells and plays a dual role in cancers, in that it has both a tumor suppressor role and tumor-promoting activity. Thus, through the activation of tumor cells, the C5b-9-mediated induction of the cell cycle plays an important role in tumor proliferation and oncogenesis.

Systemic sclerosis-polymyositis overlap syndrome associated with autoimmune hepatitis and cerebral vasculitis.

Autoimmune hepatitis (AIH) is a chronic disorder characterized by persistent hepatocellular inflammation and necrosis. AIH overlap syndromes with other autoimmune diseases have been reported, including connective tissue diseases (CTD). Reports of AIH in systemic sclerosis (SSc), however, are scarce and have been particularly described in the limited SSc subtype. We report a case of systemic sclerosis-polymyositis overlap syndrome that developed AIH and subsequently, cerebral vasculitis. To our knowledge, this is the first report of such a complex mosaic of autoimmunity. We also review the literature regarding scleroderma-related AIH.

Epigenetic modifications induced by RGC-32 in colon cancer.

First described as a cell cycle activator, RGC-32 is both an activator and a substrate for CDC2. Deregulation of RGC-32 expression has been detected in a wide variety of human cancers. We have now shown that RGC-32 is expressed in precancerous states, and its expression is significantly higher in adenomas than in normal colon tissue. The expression of RGC-32 was higher in advanced stages of colon cancer than in precancerous states or the initial stages of colon cancer. In order to identify the genes that are regulated by RGC-32, we used gene array analysis to investigate the effect of RGC-32 knockdown on gene expression in the SW480 colon cancer cell line. Of the 230 genes that were differentially regulated after RGC-32 knockdown, a group of genes involved in chromatin assembly were the most significantly regulated in these cells: RGC-32 knockdown induced an increase in acetylation of histones H2B lysine 5 (H2BK5), H2BK15, H3K9, H3K18, and H4K8. RGC-32 silencing was also associated with decreased expression of SIRT1 and decreased trimethylation of histone H3K27 (H3K27me3). In addition, RGC-32 knockdown caused a significantly higher percentage of SW480 cells to enter S phase and subsequently G2/M. These data suggest that RGC-32 may contribute to the development of colon cancer by regulating chromatin assembly.

The long-term evolution of chronic hepatitis B acquired in childhood.

UNLABELLED: The AIM of this study was to assess the long-term evolution of chronic hepatitis B acquired in childhood. METHODS: The study was carried out in 2007 - 2008 on a group of 77 adult patients who were diagnosed with chronic hepatitis B in childhood. The actual assessment included epidemiological, clinical, biological and virological data, ultrasound examination in all patients and liver histology in 3 patients. RESULTS: From the 77 patients, 69 were HBeAg positive and the other 8 patients were anti-HBe positive when the diagnosis was made in their childhood. Thirty-seven patients from the HBeAg positive group and 2 patients from the anti-HBe group had been treated in childhood with IFN-alpha and the other 38 patients remained untreated (32 patients with HBeAg positive and 6 patients anti-HBe positive). Overall, 78.26% seroconverted to anti-HBe (87.50% untreated and 70.27% of patients treated with IFN). After a median follow-up period of 13 years, 36 patients from the HBeAg positive group (48.65% of treated patients and 56.25% of untreated ones) became inactive carriers. Seroconversion to anti-HBs, in the HBeAg positive group, occurred in 10.14% of cases (8.1% in treated patients) without statistical significance. Three patients from the whole group developed cirrhosis but none developed hepatocellular carcinoma. CONCLUSION: The long-term outcome in our patients with CHB acquired in childhood did not differ between treated and untreated patients.

Role of response gene to complement 32 in diseases.

The role of response gene to complement (RGC)-32 as a cell cycle regulator has been attributed to its ability to activate cdc2 kinases and to induce S-phase entry and mitosis. However, recent studies revealed novel functions for RGC-32 in diverse processes such as cellular differentiation, inflammation, and fibrosis. Besides responding to C5b-9 stimulation, RGC-32 expression is also induced by growth factors, hormones, and cytokines. Transforming growth factor beta activates RGC-32 through Smad and RhoA signaling, thus initiating smooth muscle cell differentiation. Accumulating evidence has drawn attention to the deregulated expression of RGC-32 in human malignancies, hyper-immunoglobulin E syndrome, and fibrosis. RCG-32 expression is up-regulated in cutaneous T cell lymphoma and colon, ovarian, and breast cancer, but down-regulated in invasive prostate cancer, multiple myeloma, and drug-resistant glioblastoma. A better understanding of the mechanism by which RGC-32 contributes to the pathogenesis of these diseases will provide new insights into its therapeutic potential. In this review we provide an overview of this field and discuss the most recent research on RGC-32.

Cancer mortality in Romania, 1955-2004. Digestive sites: esophagus, stomach, colon and rectum, pancreas, liver, gallbladder and biliary tree.

AIM: Until recently, gastric cancer was the most frequent digestive neoplasia in our country. Our study presents the first synthesis of data regarding mortality rates from digestive cancers, for a period covering 50 years, in Romania. METHODS: Age-standardized mortality rates /100,000 population, general and/or per gender, concerning six digestive cancers, were identified from the statistics of IARC/OMS (Lyon, France) (years 1955-2002) and of the Ministry of Public Health (Bucharest, Romania) (year 2004). For 2002, incidence and mortality rates per sex from digestive cancers were available and case fatality ratios could be calculated as an approximation of survival rates, as well as sex ratio. RESULTS: Age standardized mortality rates per sex and cancer site registered the following changes: esophageal cancer increased from 2.03/0.62 (M/F) to 2.8/0.5; gastric cancer registered a decrease, from 33.14/18.77 to 17.0/6.6; colorectal cancer increased from 4.65/4.57 to 13.6/9.0; pancreatic cancer increased from 5.50/2.92 to 8.1/4.2 and liver cancer (including peripheric cholangiocarcinoma) increased from 1.77/0.83 to 8.8/3.9. In our population, the case fatality ratio appeared to be better only in colorectal cancer, 0.61 in males and 0.62 in females, respectively. Sex ratio was highest for esophageal cancer (males/females 5.8/1) and lowest for colorectal cancer (1.5/1). CONCLUSIONS: Our study found opposite trends in the mortality rates from digestive cancers, with gastric cancer rates decreasing and the other five digestive cancers increasing. A new hierarchy of digestive cancers has been drawn up, with colorectal cancer as the main cause of death, and gastric cancer in second position, followed by pancreatic, liver, esophageal, and gallbladder and biliary tree cancers.

Four new topological indices based on the molecular path code.

The sequence of all paths pi of lengths i = 1 to the maximum possible length in a hydrogen-depleted molecular graph (which sequence is also called the molecular path code) contains significant information on the molecular topology, and as such it is a reasonable choice to be selected as the basis of topological indices (TIs). Four new (or five partly new) TIs with progressively improved performance (judged by correctly reflecting branching, centricity, and cyclicity of graphs, ordering of alkanes, and low degeneracy) have been explored. (i) By summing the squares of all numbers in the sequence one obtains Sigmaipi(2), and by dividing this sum by one plus the cyclomatic number, a Quadratic TI is obtained: Q = Sigmaipi(2)/(mu+1). (ii) On summing the Square roots of all numbers in the sequence one obtains Sigmaipi(1/2), and by dividing this sum by one plus the cyclomatic number, the TI denoted by S is obtained: S = Sigmaipi(1/2)/(mu+1). (iii) On dividing terms in this sum by the corresponding topological distances, one obtains the Distance-reduced index D = Sigmai{pi(1/2)/[i(mu+1)]}. Two similar formulas define the next two indices, the first one with no square roots: (iv) distance-Attenuated index: A = Sigmai{pi/[i(mu + 1)]}; and (v) the last TI with two square roots: Path-count index: P = Sigmai{pi(1/2)/[i(1/2)(mu + 1)]}. These five TIs are compared for their degeneracy, ordering of alkanes, and performance in QSPR (for all alkanes with 3-12 carbon atoms and for all possible chemical cyclic or acyclic graphs with 4-6 carbon atoms) in correlations with six physical properties and one chemical property.

Trends of mortality rates from gastric cancer and colorectal cancer in Romania, 1955-2003.

BACKGROUND: Steady and persisting falls in gastric cancer (GC) mortality rates have been observed worldwide in the last 50 years, and in Romania too. Colorectal cancer (CRC) is presently the most frequent digestive neoplasia in the Western countries. An increase of CRC incidence and mortality rates has been reported recently in Eastern European countries, including Romania. METHODS: Mortality data from GC and CRC, derived from population based mortality statistics, have been available on a national scale for 1955-2003. The data were identified from the statistics of the Ministry of Health (Bucharest, Romania) and of IARC/OMS (Lyon, France). GC and CRC mortality rates global and/or per gender were registered by time intervals. After 1995, only data on general mortality rates were available. RESULTS: Between 1955-59 and 1990-92, GC mortality rates/100,000 decreased from 33.14 to 17.70 in males and from 18.77 to 7.00 in females. Between 1995 and 2003, general mortality rates/100,000 from GC remained stable (17.54 and 17.74, respectively). Between 1955-59 and 1990-92, CRC mortality rates/100,000/gender increased from 4.65 to 10.10 in males and from 4.57 to 7.40 in females. Between 1995 and 2003, CRC general mortality rates/100 000 increased from 14.90 to 19.20. CONCLUSIONS: Our study reports opposite trends in GC and CRC mortality rates in the period under study, with GC declining and CRC increasing. A male predominance was registered in both neoplasms under study, more obvious in GC (male/female ratio: 2-3/1) than in CRC (male/female ratio: 1.5/1).

Pill esophagitis.

Pill esophagitis is a rare clinical diagnosis. We report a series of two patients who experienced ulcerative esophagitis while taking doxycycline (patient 1) and alendronate (patient 2). Both patients presented with retrosternal pain, odynophagia and dysphagia. Symptoms developed after 3 days of treatment with doxycycline in patient 1 and after 3 months of treatment with alendronate in patient 2. Endoscopy revealed ulcerative lesions in the mid-esophagus, sparing the distal esophagus. Biopsies showed inflammatory infiltrate (patient 1) and ulceration and hyperplastic cells (patient 2). Patient 1 recovered completely endoscopically after discontinuation of the antibiotic and a one month course of sucralfate treatment. Patient 2 did not accept the discontinuation of alendronate therapy. She also had a course of one month treatment with sucralfate. At one, two and even at seven months after the first diagnosis, endoscopy still showed the persistence of millimetric defects of epithelisation. She is still under endoscopical survey. In conclusion, doxycycline and alendronate can cause chemical esophagitis when taken improperly. In adults and elderly patients exclusion of esophageal carcinoma by histology is necessary. Continuation of treatment with the offending drug can delay healing. Pill esophagitis is a preventable cause of morbidity that consists of giving simple advice of how and when to take medication.