Biomedical subjects

Michiaki Koga

Publications and source records attributed to Michiaki Koga.

41 records · Page 3Linked to original sources

PubMed2002

Present status of hepatitis virus-associated hepatocellular carcinoma in Nagasaki Prefecture, Japan: a cross-sectional study of 1019 patients.

The present study was designed to determine the frequency of hepatitis B virus (HBV) and hepatitis C virus (HCV) infection in patients with hepatocellular carcinoma (HCC) in Nagasaki Prefecture, Japan. We examined the clinical features of 1019 patients with HCC who visited our hospitals between January and December 1999. The ratio of men to women was 709 : 310, and the peak incidence of HCC was in the seventh decade of life in both men and women. In the majority of the patients, HCC showed association with HCV infection (74%) compared with HBV infection (17%). HBV-associated HCC was more common in young patients, while HCV-associated HCC was more common in patients with a history as a "daily drinker", or with a history of blood transfusion, liver cirrhosis, and persistently high serum transaminases before the diagnosis of HCC. HCC was initially suspected by ultrasonography or computed tomography in 776 of the 874 patients for whom there was a history of mode of detection of HCC (89%). Tumor size at the time of diagnosis of HCC in patients who had been regularly followed up for liver diseases at our hospitals was significantly smaller than that in patients who were not followed up regularly before the diagnosis ( P < 0.01). Our results indicate that the proportions of patients with HBV or with HCV infection among HCC patients in Nagasaki Prefecture are similar to those found in a nationwide survey in Japan, and there are some differences between the clinical manifestations of HBV- and HCV-associated HCC. Our results emphasize the importance of close follow-up for the high-risk group (i.e. those with HBV- or HCV-associated chronic liver diseases) for the early detection of HCC.

Adult↗

PubMed2002

Influence of interleukin-10 gene promoter polymorphisms on disease progression in patients chronically infected with hepatitis B virus.

OBJECTIVES: The role of host genetic factors in chronic hepatitis B virus (HBV) infection is not fully understood. We studied the influence of tumor necrosis factor-alpha (TNF-alpha) and interleukin-10 (IL-10) gene promoter polymorphisms on disease progression in HBV carriers. METHODS: The sample population included 213 Japanese HBV carriers and 52 healthy volunteers. Of 213 HBV carriers, 66 were considered to be asymptomatic carriers based on the sustained normalization of serum ALT together with seropositivity for the antibody to hepatitis B e antigen (anti-HBe), and 147 were found to have chronic progressive liver disease including cirrhosis. Five biallelic polymorphisms in the TNF-alpha gene promoter and three biallelic polymorphisms in the IL-10 gene promoter were analyzed by polymerase chain reaction in combination with direct sequencing or restriction fragment length polymorphism assay. RESULTS: Allelic distributions of both gene promoters were not significantly different between HBV carriers and healthy volunteers. In HBV carriers, the TNF-alpha gene promoter polymorphisms were not linked to disease progression. In contrast, allelic frequencies of T and A at positions -819 and -592, respectively, in the IL-10 gene promoter, as well as the frequencies of ATA haplotype at positions -1082/-819/-592 (which is characterized with low capacity for IL-10 production), were significantly higher in asymptomatic carriers than in patients with chronic progressive liver disease. Even after adjusting for individuals positive for anti-HBe, such a relationship could be found between the two groups. CONCLUSION: In chronic HBV infection, inheritance of the IL-10 gene promoter polymorphisms is involved in a host genetic factor that is relevant to disease progression.

Adult↗

PubMed2002

Fulminant Guillain-Barré syndrome after Campylobacter jejuni enteritis and monospecific anti-GT1a IgG antibody.

A 21-year-old man developed rapid progression of tetraplegia, bulbar palsy, and respiratory paralysis after Campylobacterjejuni enteritis. Based on the diagnosis of Guillain-Barré syndrome, he received plasmapheresis and intravenous immunoglobulin. Serum anti-GT1a IgG antibody which lacked cross-reactivity with GQ1b was detected. Four months after the onset, the patient still had severe muscle weakness of the lower limbs. This case suggests that anti-GT1a IgG antibody can be associated with severe paralysis in Guillain-Barré syndrome after C. jejuni enteritis.

Adult↗

PubMed2002

[A case of Fisher's syndrome after Haemophilus influenzae infection].

We report a case of Fisher's syndrome with serological evidence of antecedent Haemophilus influenzae infection. A 66-year-old woman developed unsteady gait and multiple cranial nerve palsies after upper respiratory infection. Serum anti-GQ 1 b and anti-GT 1 a IgG antibodies were positive. In the acute phase of the illness, her serum had high titers of IgM, IgG and IgA anti-H. influenzae antibodies, which significantly decreased during the clinical course. Further study is needed to clarify the clinical and immunological features of Fisher's syndrome after H. influenzae infection.

Aged↗

PubMed2002

[A case of pharyngeal-cervical-brachial weakness suggestive of the nosological continuity between acute oropharyngeal palsy].

A 68-year-old man without history of antecedent infection experienced nasal voice (day 1), and the developed dysphagia on day 9. Eleven days after the onset, he developed ophthalmoplegia, and on day 13 mild weakness in the neck and the upper limbs. Cerebrospinal fluid examination revealed albuminocytologic dissociation on day 19. Motor nerve conduction velocities and compound muscle action potentials were normal, but terminal latency was slightly prolonged in the median nerve. Enzyme-linked immunosorbent assay showed that the patient's anti-GT1 a IgG antibody fiter was high and that the antibody cross-reacts with GQ1b. We considered that this patient showed acute oropharyngeal palsy at the onset, and then evolved into pharyngeal-cervical-brachial weakness. The presence of this case suggested the nosological continuity between acute oropharyngeal palsy and pharyngeal-cervical-brachial weakness in both clinical and serological aspects.

Aged↗