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K Iriya

Publications and source records attributed to K Iriya.

At least 19 recordsLinked to original sources
PubMed2005

Ki-67 as a prognostic marker in colorectal cancer but not in gastric cancer.

The growth of tumors is highly variable and this probably reflects even its clinical course. The monoclonal antibody Ki-67 recognises an antigen present in the nuclei of cells in all phases of the cell cycle except G0. In the current study, we examined by immunohistochemistry the proliferative activity, based on Ki-67 labeling index (Ki67LI), in formalin-fixed and paraffin-embedded sections of 152 tumors, being 70 gastric and 89 colorectal cancers. The results obtained were correlated with the clinicopathologic factors. The carcinomas showed a wide range of Ki-67LI, reflecting a variation in proliferative activity. The tumor labeling index ranged from 10 to 85 per cent positivity, being the mean level in gastric cancer tissue 0.52 and in colorectal cancer 0.44. There was also heterogeneity of labeling within many of the tumors. No significant correlation was found between Ki-67LI and sex, age, clinical stage in these cancers. In colorectal cancer, but not in gastric cancer, high levels of Ki67LI have been correlated with poor survival. Ki-67 staining is a simple and useful method for estimating proliferative activity. The importance of Ki-67 as an indicator of tumor behaviour is not clear. In colorectal cancer this index may be used as a marker of prognosis.

Biomarkers, Tumor↗
PubMed2002

Comparative study of portal hypertensive gastropathy in schistosomiasis and hepatic cirrhosis.

BACKGROUND AND STUDY AIMS: Portal hypertensive gastropathy (PHG) is a common finding in chronic liver disease, but it has not been evaluated in hepatosplenic schistosomiasis, a significant cause of noncirrhotic portal hypertension worldwide. Our study was aimed at comparing cirrhosis with hepatosplenic schistosomiasis with regard to the endoscopic and histological findings of PHG. PATIENTS AND METHODS: We included 43 patients with a history of upper digestive hemorrhage, 22 with cirrhosis and 21 with schistosomiasis, without previous surgical or endoscopic treatment. Upper digestive endoscopies with macrobiopsies of the gastric body were prospectively performed in all cases. RESULTS: The endoscopic signs of PHG were more prevalent in cirrhosis than schistosomiasis (81.8 % vs. 33.3 %; P < 0.05), and the mosaic pattern was the main finding. Histological abnormalities were evenly distributed. CONCLUSIONS: In agreement with other investigations, this study shows a lower prevalence of endoscopic findings of portal hypertensive gastropathy in noncirrhotic diseases. This difference cannot be explained by the underlying microscopic alterations, which were similar in both groups, suggesting that other factors must play a role in its pathogenesis.

Adolescent↗
PubMed2001

Serological Immunoglobulin G antibody titers to Helicobacter pylori in Japanese Brazilian and Non-Japanese Brazilian gastric cancer patients and controls in São Paulo.

Helicobacter pylori (H. pylori) infection is considered a cause of gastric cancer (GC), though evidence for this association is scarce in high-risk areas. Possible case control and/or ethnic differences were investigated as to the presence of H. pylori and its immunogloblin G antibody titer in the multi-ethnic city of São Paulo, where the incidence of GC is relatively high. We performed a cross-sectional comparison of antibody titers to H. pylori in Japanese Brazilian, and non-Japanese Brazilian GC patients and their controls. Japanese Brazilian patients were matched by age, sex and ethnicity with two controls, while non-Japanese Brazilian patients were matched as above with one control. Among Japanese Brazilians, 59 of 93 (63.4%) patients with GC and 127 of 186 (68.3%) controls were positive for H. pylori-specific antibody (odds ratio (OR) = 0.80, 95% confidence interval (CI) = 0.47 - 1.36), while among non-Japanese Brazilians, 171 of 228 patients with GC (75.7%) and 178 of 226 controls (78.8%) were positive (OR = 0.84, 95% CI = 0.54 - 1.30). The median serum antibody titer was lower in cases than in controls in both ethnic groups. A high titer (H. pylori titer > or = 50) was associated with less likelihood of GC for both ethnic groups (for Japanese Brazilians, OR = 0.39, 95% CI = 0.16 - 0.92; for non-Japanese Brazilians, OR = 0.56, 95% CI = 0.31 - 1.02). The high titer can be regarded as a sign of the necessity of eradication, and low titer is regarded as a sign of the necessity of close screening for GC in both ethnic groups, because extended atrophy may cause spontaneous disappearance of H. pylori from the stomach.

Adenocarcinoma↗
PubMed2001

Epstein-Barr virus-associated gastric carcinoma in Japanese Brazilians and non-Japanese Brazilians in São Paulo.

The proportion of Epstein-Barr virus-associated gastric carcinoma (EBV-GC) was examined in 149 Japanese-Brazilian and 151 non-Japanese-Brazilian gastric-carcinoma cases using in situ hybridization (ISH) assay to detect EBV-encoded small RNA (EBER), and the results were compared with our referent Japanese data. We found that 4.7% of cases in Japanese Brazilians were EBER-positive. This frequency was slightly lower than that of the referent Japanese, among whom 6.2% of 2038 gastric-carcinoma cases were EBER-positive. On the other hand, the non-Japanese-Brazilian series showed a significantly higher proportion of EBV-GC (11.2%) than the referent group did (P = 0.01). Although EBV-GC was predominant in males among non-Japanese Brazilians (M / F = 3.6, P = 0.047), as was the case in Japanese (M / F = 2.7), Japanese Brazilians did not show such a male predominance. The sex-ratio difference between the Japanese Brazilians and Japanese was statistically significant (P = 0.005). In conclusion, the present study in Japanese Brazilians and Japanese yielded no evidence suggesting any change in the frequency of EBV-GC caused by migration, except the absence of male predominance, which was observed both in Japanese and non-Japanese Brazilians.

Adenocarcinoma↗
PubMed2001

Intestinal permeability in strongyloidiasis.

The objective of the present study was to assess intestinal permeability in patients with infection caused by Strongyloides stercoralis. Twenty-six patients (16 women and 10 men), mean age 45.9, with a diagnosis of strongyloidiasis were evaluated. For comparison, 25 healthy volunteers (18 women and 7 men), mean age 44.9, without digestive disorders or intestinal parasites served as normal controls. Intestinal permeability was measured on the basis of urinary radioactivity levels during the 24 h following oral administration of chromium-labeled ethylenediaminetetraacetic acid ((51)Cr-EDTA) expressed as percentage of the ingested dose. The urinary excretion of (51)Cr-EDTA was significantly reduced in patients with strongyloidiasis compared to controls (1.60 +/- 0.74 and 3.10 +/- 1.40, respectively, P = 0.0001). Intestinal permeability is diminished in strongyloidiasis. Abnormalities in mucus secretion and intestinal motility and loss of macromolecules could explain the impaired intestinal permeability.

Adult↗
PubMed2000

Ethnic differences in serum pepsinogen levels among Japanese and non-Japanese Brazilian gastric cancer patients and controls.

A low level of serum pepsinogen I (Pg I) is a risk factor for gastric cancer (GC); low levels of Pg I and the pepsinogen ratio (Pg I:Pg II) are correlated with chronic atrophic gastritis. We report serum Pg levels and compare the degree of association with GC among Japanese and non-Japanese Brazilians. Sera were cross-sectionally ascertained from 93 Japanese Brazilian patients category matched by age and sex with 110 controls, and 228 non-Japanese Brazilian patients individually matched by age and sex with one control. Among non-Japanese Brazilians, GC was associated with a Pg I level <30 ng/ml (odds ratio [OR], 2.5; 95% confidence interval [CI], 1.7-3.8) and a Pg I:Pg II ratio < 3.0 (OR, 3.4; 95% CI, 2.2-5.3). However, among Japanese Brazilians, the association was present with a level of Pg I < 30 ng/ml (OR, 3.5; 95% CI, 1.9-6.3), and was weak with a Pg I:Pg II ratio < 3.0 (OR, 1.3; 95% CI, 0.73-2.4). Serum Pg I may be preferred to the Pg I:Pg II ratio to study the association between Pg and GC among Japanese Brazilians.

Adult↗
PubMed1996

Morphologic, histologic, and molecular similarities between adenocarcinomas arising in the gastric stump and the intact stomach.

BACKGROUND: Patients with gastric remnants resulting from partial resections have an increased risk for carcinoma. It is unclear whether adenocarcinoma arising in the gastric stump (GSca) differs from intact stomach carcinoma (Gca). The goal of this study was to examine the pathologic and molecular features of GSca and compare them with Gca. METHODS: Adjacent nonmalignant areas and tumors from 14 patients who were 19-55 years postgastrectomy (mean, 32.1 years) were compared with 14 Gca by pathologic and molecular analysis. Formalin fixed, paraffin embedded specimens were immunohistochemically stained for p53 followed by topographic genotyping. Exons 5-8 were amplified by the polymerase chain reaction and directly sequenced. RESULTS: No differences were noted between the two groups regarding gender, types of metaplasia, dysplasia, morphology, or histologic tumor type. However, a higher incidence of cystic dilatation and foveolar hyperplasia were present in GSca. p53 gene point mutations occurred in 5 of 14 (35.7%) GSca patients. GSca p53 mutations included missense point mutations (G:A transitions in four patients and G:C transversion in one patient) with allelic loss. In four of the five patients with p53 mutations, the same mutation was also observed in the adjacent area. p53 point mutations were present in 4 of 14 Gca (28.6%), in exons 5, 6, and 8. In one case, the same mutation was also detected in the adjacent nonmalignant mucosa. CONCLUSIONS: Similarities in clinical, pathologic, and molecular features between GSca and Gca suggest the possibility that they share similar mechanisms of carcinogenesis. p53 gene alterations in premalignant areas may denote a possible early role of this gene in gastric carcinoma.

Adenocarcinoma↗
PubMed1995

[Choristoma of the gastric mucosa: report of a case].

Choristomas are tumor like masses consisting of tissues that are histologically normals but in abnormal location. These are rare in oral cavity and occur generally in tongue. There are seven categories of choristomas on the basis of types of tissues recognized. The presenting case in a gastric mucosal choristoma type, and the treatment was surgical excision. No recurrence of the mass was revealed. Special care should be taken with lingual thyroïd choristoma, because 86% of the cases is the only functional thyroide tissue in the body.

Child↗
PubMed1994

Helicobacter pylori and refractory duodenal ulcers: cross-over comparison of continued cimetidine with cimetidine plus antimicrobials.

OBJECTIVES: To determine the distribution of Helicobacter pylori in the antral and duodenal mucosa of patients with duodenal ulcers refractory to 12 wk of treatment with cimetidine and to evaluate the effect of adding antimicrobial agents to cimetidine on the healing of refractory duodenal ulcers. METHODS: A randomized crossover comparison of continued 800 mg of cimetidine at night for 4 wk with cimetidine plus 500 mg of amoxycillin three times a day for the first 2 wk and 250 mg of metronidazole three times a day for the second 2 wk. H. pylori status in the gastric antral and duodenal mucosa was evaluated by histology and bacterial culture before and at the end of each treatment period. RESULTS: Forty-eight patients were studied. Upon entry to the study, all patients had antral colonization with H. pylori. In the duodenum, active chronic duodenitis was present in 66%, duodenal gastric metaplasia in 33%, and H. pylori in 50%, similar proportions to patients with nonrefractory duodenal ulcers. Healing occurred in 70% (30 of 43) of patients during treatment with cimetidine plus antimicrobials but in only 21% (6 of 28) during treatment with cimetidine alone (p = 0.0003). In patients who received antimicrobials, neither clearance of H. pylori from the antrum (58% of patients) or duodenum (71% of colonized patients) nor eradication of H. pylori (33%) was significantly correlated with ulcer healing. CONCLUSIONS: The distribution of H. pylori in refractory duodenal ulcers is similar to nonrefractory ulcers, and the combination of amoxycillin and metronidazole with cimetidine increases the proportion of refractory duodenal ulcers, which heals.

Adult↗
PubMed1975

Effects of sex hormones on development of urinary bladder tumours in rats induced by N-butyl-N-(4-hydroxybutyl) nitrosamine.

Male and female Wistar strain rats were given 0.05% N-butyl-N-(4-hydroxybutyl) nitrosamine (BBN) in their drinking water for 6 weeks and then water without BBN for 18 weeks. Diethylstilbestrol and testosterone were implanted subcutaneously into both intact and gonadectomised animals before or after treatment with BBN to evaluate their effects on the development of bladder tumours. Diethylstilboestrol reduced the incidence of bladder tumours significantly in male rats. The incidence was higher in female rats after spaying and administration of testosterone after BBN treatment, than in the intact female. These results suggest that diethylstilboestrol inhibits carcinogenesis of the urinary bladder induced by BBN and growth of bladder tumours induced by BBN, in male rats. On the other hand, testosterone seems to stimulate the growth of bladder tumours induced by BBN in female rats.

Animals↗
PubMed1975

Studies on urinary isozymes of lactic dehydrogenase and beta-glucuronidase in patients with bladder tumors.

Isozymes of urinary lactic dehydrogenase (LDH) were studied in 55 subjects, including 17 patients with bladder tumors. Normal clear urine from healthy persons showed little activity of LDH5, but in 11 out of 17 patients with bladder tumors LDH5 was increased sufficiently to invert the ratio of LDH5/LDH1, although the urine was not contaminated appreciably with leucocytes. Studies on tissue LDH isozymes in 16 tumors specimens strongly suggested that increased LDH5 in the urine of patients with bladder tumors originated from the tumors themselves. beta-Glucuronidase (B-G) isozymes were studied in urine specimens from 10 normal subjects, and 10 patients with bladder tumors and in 5 specimens of normal epithelium and 5 of tumor tissue. Two or three distinct bands of beta-G were separated from specimens of urine and tumor tissue from patients with bladder tumors, but only a single band was found in specimens from normal subjects.

Electrophoresis, Cellulose Acetate↗