H Ishikawa

Osaka Medical Center for Cancer and Cardiovascular Diseases, Ōsaka, Ōsaka, Japan

Are you H Ishikawa?

Claim your profile

Publications (14)81.87 Total impact

  • I Kaji · H Kasugai · A Takenaka · H Ishikawa · A Inoue · H Iishi · S Ishiguro · M Tatsuta ·
    [Show abstract] [Hide abstract]
    ABSTRACT: Pathologic diagnostic criteria for intrahepatic nonmalignant nodules using needle biopsy are controversial. To evaluate the cytodiagnostic criteria for dysplastic nodules using aspiration biopsy, a follow-up study of nonmalignant nodules was performed. Fifty-one intrahepatic nodules diagnosed histologically and cytologically as nonmalignant using an aspiration biopsy in 39 patients were followed up without treatment. The outcomes of the nodules were investigated using the Kaplan-Meier method and Cox's multivariate analysis. The cumulative rates of development to HCC at the 2nd year were 0%, 18%, and 53% in the non-dysplastic nodules, the low-grade dysplastic nodules, and the high-grade dysplastic nodules, respectively; and significant differences were seen among them (P= 0.0001). Multivariate analysis showed that cytologic grade was a significant risk factor for development to HCC (P=0.020). In conclusion, aspiration cytology was useful for diagnosis of the dysplastic nodules to predict risks of development to HCC.
    Journal of experimental & clinical cancer research: CR 10/2004; 23(3):425-31. · 4.23 Impact Factor
  • I Akedo · H Ishikawa · T Ioka · I Kaji · H Narahara · S Ishiguro · T Suzuki · T Otani ·
    [Show abstract] [Hide abstract]
    ABSTRACT: To determine whether the colonic epithelial proliferation rate is useful as a marker for colorectal cancer, we measured the Ki-67 labeling index (LI) in normal-appearing mucosa from the sigmoid and ascending colon in patients with two or more tumors (early cancers, which are defined as tumors the depth of invasion of which is limited to mucosal layer or submucosal layer, adenomas, or both). The association of baseline LI with the risk of development of colon tumors 2 years after endoscopic removal was assessed by cohort analysis. The presence of two or more tumors was defined as occurrence. One hundred and six specimens from the sigmoid colon and 130 from the ascending colon from 246 subjects (203 males and 43 females) were used for analysis. The patients with higher upper-third LI in the normal-appearing mucosa in the sigmoid colon, but not in the ascending colon, had significantly more tumors at follow-up colonoscopy 2 years later (risk ratio, 3.6; 95% confidence interval, 1.2-10.6). Moreover, multivariate analysis showed that it was an independent factor. We concluded that the higher upper-third Ki-67 LI of normal-appearing mucosa in the sigmoid colon indicates a high risk for colorectal cancer.
    Cancer Epidemiology Biomarkers & Prevention 10/2001; 10(9):925-30. · 4.13 Impact Factor
  • H Ishikawa · T Suzuki · T Ioka · T Otani ·

    Nippon rinsho. Japanese journal of clinical medicine 10/2000; 58 Suppl:325-9.
  • N Uedo · H Ishikawa · H Narahara · I Akedo · K Iseki · I Kaji · S Ishiguro · T Suzuki · T Otani ·
    [Show abstract] [Hide abstract]
    ABSTRACT: We evaluated the usefulness of carcinoembryonic antigen (CEA) concentrations in colonic effluent as a high-risk marker for colorectal carcinoma (CRC). After 213 patients ingested 1,800 ml of a 5% isotonic solution of magnesium citrate, colonic effluent was collected from them before routine colonoscopy from February through June 1992. Of these patients, 27 who had undergone colonoscopy after a mean of 2.6 years were selected as subjects. The relationship between the CEA concentration in the colonic effluent and the occurrence of new colorectal tumors was examined. The CEA concentration in colonic effluent was adjusted on the basis of alkaline phosphatase activity. New colorectal tumors were noted significantly more frequently (P = .006) in patients with a high CEA level in colonic effluent (5 of 5; 100%) than in those with low a CEA level (6 of 22; 27%). The CEA concentration in colonic effluent is a simple and practical biomarker for identification of patients at high risk for CRC.
    Cancer Detection and Prevention 02/2000; 24(3):290-4. · 2.52 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The inhibitory effect of n-3 polyunsaturated fatty acids on human colorectal cancer has been speculated on from epidemiological data and animal studies. We conducted a long-term trial of docosahexanoic acid (DHA)-concentrated fish oil capsules for patients in a high-risk group for colorectal cancer. During this trial, we experienced three patients with familial adenomatous polyposis (FAP) diagnosed as having malignant lesions. Three patients with FAP and two patients with multiple (more than 30) colorectal polyps were administered DHA-concentrated fish oil capsules_Hlk427554600[2.2 g of DHA and 0.6 g of eicosapentanoic acid (EPA) per day] for one or two years. Compliance with DHA-concentrated fish oil capsules was more than 90% in four patients and 61% in one patient. A marked increase or decrease in the number of polyps was not observed. Three patients with FAP developed endometrial cancer after 12 months, colon cancer after 24 months and lung cancer after 12 months, respectively. All cancers were diagnosed at an early stage and were resected curatively. We thought that the possibility of developing cancer from the long-term administration of fish oil capsules to patients with FAP needs to be investigated further, and that we should report these cases.
    Japanese Journal of Clinical Oncology 01/1999; 28(12):762-5. DOI:10.1093/jjco/28.12.762 · 2.02 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The effect of interferon therapy on the incidence of hepatocellular carcinoma in chronic hepatitis C is poorly defined. To compare the incidence of hepatocellular carcinoma in interferon-treated patients with chronic hepatitis C to that of historical controls and to examine whether response to therapy is related to incidence of hepatocellular carcinoma in patients with chronic hepatitis C. Retrospective cohort study. One university hospital and seven university-affiliated hospitals. 419 consecutive patients with chronic hepatitis C who started interferon therapy between January 1992 and December 1993 (interferon group) and 144 patients with chronic hepatitis C who had liver biopsy between January 1986 and December 1989 and did not receive interferon (controls). Patients in the interferon group received human lymphoblastoid interferon, recombinant interferon-alpha2a, or recombinant interferon-alpha2b for 6 months. The end point was development of hepatocellular carcinoma on abdominal ultrasonography or computed tomography. Sustained response was defined as persistent normalization of alanine aminotransferase (ALT) levels during interferon therapy and follow-up. Relapse was defined as a normal serum ALT level at the end of treatment with an increase to an abnormal level after cessation of treatment. Nonresponse included all other ALT patterns. Median follow-up in the interferon and control groups was 47.6 and 46.8 months, respectively. During follow-up, hepatocellular carcinoma was found in 28 interferon-treated patients and 19 controls. Cox proportional hazards regression analysis that included all patients revealed that interferon therapy (P=0.041), older age (P=0.003), greater histologic activity (P=0.029), and higher histologic stage (P=0.049) were independent factors associated with the development of hepatocellular carcinoma. The risk ratios for development of hepatocellular carcinoma in patients with sustained response, relapse, and nonresponse were 0.06 (95% CI, 0.01 to 0.46), 0.51 (CI, 0.20 to 1.27), and 0.95 (CI, 0.48 to 1.84), respectively, compared with controls. The incidence of hepatocellular carcinoma was lower in patients with sustained response to interferon therapy than historical controls and nonresponders. Interferon therapy may decrease the risk for hepatocellular carcinoma in patients with chronic hepatitis C.
    Annals of internal medicine 08/1998; 129(2):94-9. · 17.81 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The pathogenesis of ulcerative colitis is unclear, but cytotoxic T lymphocytes infiltrating the mucosa have been implicated in mucosal damage. The Fas ligand (FasL), expressed on cytotoxic T lymphocytes, induces apoptosis in cells expressing Fas. To analyse FasL expression in affected colonic mucosa to ascertain Fas-FasL interaction in ulcerative colitis. FasL mRNA was quantified in colonic mucosal specimens from healthy subjects and patients with ulcerative colitis or Crohn's disease, using the competitive reverse transcription polymerase chain reaction. FasL mRNA localisation was determined by in situ hybridisation. Expression of Fas in colonic mucosa was analysed immunohistochemically. Phenotypes of lamina propria lymphocytes that expressed FasL were analysed by flow cytometry. FasL mRNA was strongly expressed in active ulcerative colitis lesions, but not in those associated with active Crohn's disease or active proctitis-type ulcerative colitis. In situ hybridisation showed that FasL mRNA expression occurred in mononuclear cells infiltrating lesions. Fas was expressed in epithelial cells in ulcerative colitis and Crohn's disease, and in normal subjects. Cytometry showed that FasL was expressed in CD3 lymphocytes infiltrating the lamina propria in active lesions. FasL is expressed in CD3 lymphocytes infiltrating into ulcerative colitis but not Crohn's disease lesions, suggesting that Fas-FasL induced apoptosis participates in the mucosal damage of ulcerative colitis.
    Gut 08/1998; 43(1):48-55. DOI:10.1136/gut.43.1.48 · 14.66 Impact Factor
  • Source
    H Ishikawa · I Akedo · T Suzuki · H Narahara · T Otani ·

    JNCI Journal of the National Cancer Institute 10/1997; 89(18):1381. DOI:10.1093/jnci/89.18.1381 · 12.58 Impact Factor
  • Y Nagasawa · H Ishikawa · H Iishi · M Tatsuta · S Ishiguro ·
    [Show abstract] [Hide abstract]
    ABSTRACT: There is presently no consensus on how long treatment of gastric ulcers should be continued to prevent ulcer recurrence. Therefore, we investigated the histologic state of healing, and the recurrence of gastric ulcers with Helicobacter pylori infection classified by gastric mucosal microvascular architecture as completely and incompletely healed. We obtained biopsy specimens from healed gastric ulcers in 71 patients who had been treated for eight weeks with omeprazole. The gastric mucosal microvascular architecture of the biopsy specimens was observed by the alkaline phosphatase staining method. We found a significant correlation between the mucosal microvascular architecture in the biopsy specimens and the histologic state of ulcer healing Recurrences were significantly more frequent in ulcers classified by microvascular architecture as incompletely healed than in completely healed ulcers. Observing the microvascular architecture of healed gastric ulcers is very useful for judging the state of healing, and therapy should be continued until ulcers are classified by this method as completely healed.
    Hepato-gastroenterology 01/1996; 43(10):866-872. · 0.93 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Effects of rat and porcine galanin on rat intestinal ion transport were examined in vitro. In the rat distal colon, a sustained increase in short-circuit current (Isc) was produced by the serosal addition of rat galanin at a concentration as low as 10(-9) M, and a maximal increment was observed at 10(-7) M. Porcine galanin was approximately 100 times less potent than rat galanin. In the rat jejunum, rat galanin produced only a slight and transient decrease in basal Isc. The response to rat galanin was not influenced by atropine, hexamethonium, or amiloride, but was virtually abolished by tetrodotoxin or furosemide. Rat galanin did not significantly influence the increase in Isc elicited by electrical field stimulation in the rat colon and jejunum. Transmural unidirectional 22Na and 36Cl fluxes in the rat colonic mucosa were measured under short-circuited conditions, and rat galanin significantly decreased net sodium and net chloride absorption. These findings suggest that galanin acts as a secretory modulator in the rat colon via noncholinergic neural transmission.
    The American journal of physiology 11/1992; 263(4 Pt 1):G502-7. · 3.28 Impact Factor
  • M Okuno · T Nakanishi · Y Shinomura · T Kiyohara · H Ishikawa · S Tarui ·
    [Show abstract] [Hide abstract]
    ABSTRACT: Peptide YY (PYY) is thought to possess paracrine and endocrine functions. The highest concentrations of this peptide are in the colonic mucosa. The effect of PYY on electrolyte and water transport in the rat colon was studied in vivo. Under urethane anesthesia, rat colonic loops were perfused at a constant rate with physiological buffer solution containing phenol red as a nonabsorbable volume marker, and net movements of water, sodium, chloride and potassium in the perfused colon were determined every 10 min. Intravenous administration of PYY produced a dose-dependent increase in the net absorption of sodium chloride and water, as well as a decrease in the net secretion of potassium. PYY inhibited the reduction in net absorption of sodium chloride and water evoked by vasoactive intestinal peptide (VIP), but did not affect the VIP-evoked increase in net potassium secretion. These findings suggest that PYY acts as an enhancer of sodium chloride and water absorption and as an antagonist to VIP-induced secretion in the colon.
    Experientia 02/1992; 48(1):47-50. DOI:10.1007/BF01923605
  • Source
    M Tatsuta · H Ishikawa · H Iishi · S Okuda · Y Yokota ·
    [Show abstract] [Hide abstract]
    ABSTRACT: The effect on the recurrence of gastric ulcers after suppression of Helicobacter pylori by combined treatment with cimetidine and the antimicrobial drug cefixime was investigated. Twenty one of 43 patients with endoscopically proved gastric ulcer and H pylori infection were randomly assigned to receive cimetidine 800 mg daily for 12 weeks; the remaining 22 patients received cimetidine 800 mg daily for 12 weeks plus cefixime 100 mg daily for the last two weeks. After treatment, 88% of 17 patients on cimetidine only remained H pylori positive, whereas combined administration of cimetidine and cefixime had suppressed H pylori in 78% of 18 patients (p less than 0.05). Seventeen patients in the former group whose ulcers healed but who remained H pylori positive and 18 patients in the latter group whose ulcers healed and who were no longer infected with H pylori continued to be followed after treatment. These patients underwent endoscopy to detect ulcer recurrence if symptomatic, or at 12 and 24 weeks if asymptomatic. At 12 weeks, recurrence was observed in seven of 15 (47%) patients in whom H pylori persisted, but in only one of 14 (7%) patients in whom H pylori had been suppressed (p less than 0.05). At 24 weeks, however, recurrence rates were similar between the two groups. These findings indicate that H pylori infection may be closely related to early ulcer recurrence.
    Gut 10/1990; 31(9):973-6. DOI:10.1136/gut.31.9.973 · 14.66 Impact Factor
  • H Ishikawa · K Imanishi · T Otani · S Okuda · M Tatsuta · S Ishiguro ·
    [Show abstract] [Hide abstract]
    ABSTRACT: The effectiveness of endoscopic polypectomy in the treatment of carcinoid tumors of the rectum was investigated. Flat tumors of less than 1.5 cm in the largest diameter, of normal or yellow color, consisting histologically of solid nodular nests or trabecular or ribbon-like structures were "early" tumors, in which the tumor cells were confined to the mucosa and submucosa, and did not involve deeper layers. Eight patients with "early" carcinoids were treated by endoscopic polypectomy. Subsequently, two of them were submitted to surgery, while the other six were followed-up endoscopically. Histological examination of the specimens obtained at operation showed no evidence of residual tumor cells at the polypectomy site. Endoscopic follow-up studies also failed to reveal local recurrence in any of the patients during the average observation period of 1.3 years. The wall of the rectum was significantly thicker than that of the sigmoid colon, so that deeper local excision was possible. These findings indicate that even though "early" carcinoid tumors of the rectum showed submucosal invasion, they were completely cured by local endoscopic excision.
    Endoscopy 06/1989; 21(3):133-5. DOI:10.1055/s-2007-1012922 · 5.05 Impact Factor
  • R Murakami · A Oshima · H Tsukuma · K Imanishi · T Otani · H Ishikawa · M Sato · I Fujimoto ·
    [Show abstract] [Hide abstract]
    ABSTRACT: In order to elucidate the natural history of colorectal polyps and to examine the effectiveness of endoscopic polypectomy in reducing the incidence of colorectal cancer, we conducted a retrospective cohort study of all patients who had undergone endoscopic examination at the Center for Adult Diseases, Osaka in 1970-82. The study subjects consist of 653 non-polyp cases and 431 colorectal polyp cases including 222 cases treated by endoscopic polypectomy. These were followed up until the end of 1985 by the method of a record linkage with the Osaka Cancer Registry's file. The colorectal polyp group and the endoscopic polypectomy group experienced 4.4 and 2.9 times, respectively, as much incidence of colorectal cancer as the non-polyp group. The magnitude of the prevented fraction by the use of endoscopic polypectomy was estimated at 31.3%. A large-scale and long-term study is necessary to elucidate the original study purpose.
    Gan no rinsho. Japan journal of cancer clinics 02/1989; 35(2):188-94.

Publication Stats

439 Citations
81.87 Total Impact Points


  • 2000
    • Osaka Medical Center for Cancer and Cardiovascular Diseases
      Ōsaka, Ōsaka, Japan
  • 1998
    • Osaka University
      • School of Medicine
      Suika, Ōsaka, Japan
  • 1992
    • Osaka City University
      • Second Department of Internal Medicine
      Ōsaka, Ōsaka, Japan