Biomedical subjects

Jun Amano

Publications and source records attributed to Jun Amano.

44 records · Page 3Linked to original sources

PubMedDate not supplied

Successful resection of cardiac metastatic liposarcoma extending into the SVC, right atrium, and right ventricle.

Cardiac metastatic liposarcoma is a rare tumor. We report a case of successful resection of a cardiac metastatic liposarcoma extending into the superior vena cava (SVC), right atrium, and right ventricle. Using cardiopulmonary bypass (CPB) by venous cannulation of the upper portion of the SVC and inferior vena cava (IVC), the intracardiac tumor was completely resected. Surgical resection with the addition of radiotherapy prolonged the patient's life.

Heart Atria↗

PubMedDate not supplied

Bacteremia caused by late-infected pacemaker lead--a case report.

A 73-year-old man with bradycardia and atrial fibrillation underwent implantation of a transvenous pacemaker system on the left anterior chest wall in 1995. Six years later, he was admitted for bacteremia from coagulase-negative Staphylococcus. Repeated treatment employing antibiotic therapy was ineffective. The infected electrode was removed under cardiopulmonary bypass. His electrode had become firmly encased with fibrous tissue within the right ventricle and atrium. It was removed under direct vision during complete cardiac arrest. The postoperative course was uneventful and there has been no recurrence after 1 year.

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PubMedDate not supplied

Prognostic factors of intrahepatic cholangiocarcinoma after hepatic resection: univariate and multivariate analysis.

BACKGROUND/AIMS: Intrahepatic cholangiocarcinoma is clinicopathologically distinct from hepatocellular carcinoma and hilar cholangiocarcinoma, and the prognostic factors after hepatic resection of these rare tumors are not well documented. The aim of this study was to evaluate prognostic factors of intrahepatic cholangiocarcinoma after hepatic resection. METHODOLOGY: We retrospectively studied 20 consecutive patients with intrahepatic cholangiocarcinoma who underwent hepatectomy over a 15-year period from 1984 to 1998. Fifteen prognostic factors were evaluated for their association with overall and disease-free survivals in univariate and multivariate analysis (Cox's proportional hazards model). RESULTS: Eighty percent of the resected patients had major hepatectomy. Operative morbidity and mortality rates were 30% and 0%, respectively. Four patients (20%) survived more than 5 years without recurrence after hepatic resection. The 1-year, 3-year, and 5-year overall or disease-free survival rate after hepatic resection were 56.0% or 49.5%, 43.8% or 43.3%, and 43.8% or 37.3%, respectively. Univariate analysis showed young age and periductal invasion tumor or the presence of vascular invasion, lymphatic invasion, and lymph node metastasis as significant poor prognostic predictors contributing overall and disease-free survivals. Multivariate analysis revealed only lymph node metastasis as an independent prognostic factor affecting disease-free survival. During the same time, 17 unresectable patients were treated by intrahepatic arterial infusion chemotherapy (12), systemic chemotherapy (4), or radiation (1). Median overall survival time in resected patients (16 months) was significantly better than in unresectable patients (5 months) (P = 0.005). CONCLUSIONS: Hepatic resection remains to be the best current therapeutic option. The prognosis after hepatic resection for intrahepatic cholangiocarcinoma was determined by lymph node metastasis. New adjuvant chemotherapy after surgery is imperative for such patients.

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Hepatic resection for hepatocellular carcinoma in diameter of > or = 10 cm.

BACKGROUND/AIMS: Definitive efficacy of hepatic resection for hepatocellular carcinoma larger than or equal to 10 cm in diameter remains to be resolved. METHODOLOGY: The surgical outcomes in 33 consecutive patients with hepatocellular carcinoma in diameter of > or = 10 cm who underwent hepatic resection were retrospectively clarified. Postresection prognostic factors were evaluated by univariate and multivariate analysis using Cox's proportional hazards model. RESULTS: The overall incidence of postoperative complications was 39%, and 5 patients among them had hospital deaths (15%) including 2 (6%) operative deaths. The 3-year, 5-year, and 9-year overall survival rates after hepatic resection were 32%, 27%, and 17%, respectively. Univariate analysis revealed that liver cirrhosis and stage IV-A (pTNM staging) were significant factors of poor overall survival. By Cox's proportional hazards model, liver cirrhosis was an independently unfavorable prognostic factor of long-term survival. Hospital mortality rate in patients with cirrhosis was 31%. The 5-year overall survival rate in patients with cirrhosis (7%) was significantly shorter than that in patients without cirrhosis (43%) (P = 0.006). In addition, the 5-year overall survival rate in patients with stage IV-A (11%) was significantly shorter than that in patients with stage II and III (48%) (P = 0.024). The incidence of stage IV-A in patients with cirrhosis (77%) was significantly higher than those without cirrhosis (35%) (P = 0.032). CONCLUSIONS: Hepatic resection for hepatocellular carcinoma in diameter of > or = 10 cm was effective for patients without liver cirrhosis and with stage II or III. Appropriate selection of the candidates for partial hepatectomy based on the above prognostic factors may play an important role in the improvement of high mortality rate and poor long-term survival for such patients. Prospective randomized trials are needed to define the role of hepatic resection for cirrhotic patients with large HCC.

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Cell proliferation, apoptosis and angiogenesis in gastric cancer and its hepatic metastases.

BACKGROUND/AIMS: The levels of cell proliferation, apoptosis and angiogenesis were compared histochemically in gastric cancer and its hepatic metastases. METHODOLOGY: Tissue samples were taken from 7 patients with gastric cancer associated with synchronous and/or metachronous hepatic metastases. In the 7 gastric cancers and in 4 synchronous and 4 metachronous hepatic metastases, Ki-67 immunostaining was performed to measure the labeling index (Ki-67 LI). Terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate-biotin nick end labeling was performed to measure the apoptotic index, and immunostaining for factor VIII-related antigen was performed to measure the microvessel density. RESULTS: The Ki-67 LI was higher in the gastric cancer and the metachronous hepatic metastasis than in the synchronous hepatic metastasis (primary lesions vs. synchronous foci vs. metachronous foci: 47.1% vs. 39.3% vs. 48.0%; P < 0.05). The apoptotic index was lower in the gastric cancer and the metachronous hepatic metastasis than in the synchronous hepatic metastasis (3.50% vs. 5.01% vs. 2.64%; P < 0.05). The microvessel density was higher in the gastric cancer and the metachronous hepatic metastasis than in the synchronous hepatic metastasis (36.0 vs. 22.2 vs. 34.2; P < 0.05). CONCLUSIONS: The present results suggest that tumor growth as indicated by cell proliferation, apoptosis and angiogenesis is less vigorous in synchronous hepatic metastasis than in primary lesion and/or metachronous hepatic metastasis.

Adenocarcinoma↗

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Perioperative blood transfusion and survival following curative hepatic resection for hepatocellular carcinoma.

BACKGROUND/AIMS: The association between transfusion and recurrence after resection for hepatocellular carcinoma (HCC) is still under debate. The influences of perioperative blood transfusion on survival and recurrence after curative hepatic resection for HCC and prognostic factors in patients with blood transfusion were evaluated. METHODOLOGY: Curative hepatectomy was performed in 210 patients (57%) with and 158 (43%) without perioperative blood transfusion. Prognostic factors were evaluated by univariate and multivariate analysis using Cox's proportional hazards model. RESULTS: Multivariate analysis revealed that perioperative blood transfusion was an independent predictor for recurrence in patients with serum low albumin level (< 3.5 g/dL). In transfused group, stage IV, large tumor size (> or = 5 cm), high value of ICGR15 (> or = 20%), and old age (> or = 60 year) were independent factors of poor disease-free survival. CONCLUSIONS: Perioperative blood transfusion promotes the recurrence of HCC after hepatic resection in patients with hypo-albuminemia. In transfused patients, establishment of strategy for recurrence based on pTNM staging, tumor size, ICGR15, and age may be required to improve survival.

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PubMedDate not supplied

Risk factors of long-term survival and recurrence after curative resection of hepatocellular carcinoma.

BACKGROUND/AIMS: The independent risk factors contributing to long-term survival (> or = 10-year survival rate) and recurrence after curative hepatic resection for hepatocellular carcinoma (HCC) were evaluated. METHODOLOGY: The prognoses were retrospectively analyzed in 247 consecutive patients (187 men and 60 women) treated with curative hepatic resection for HCC and discharged from the hospital. Prognostic factors were evaluated by multivariate analysis using Cox's proportional hazards model. RESULTS: Multivariate analysis revealed that pTNM stage IV, indocyanine green retention rate at 15 minutes (ICGR15) of > or = 20%, tumor size of > or = 5 cm, and positive hepatitis B surface antigen were independent risk factors of overall survival. Stage IV and ICGR15 of > or = 20% were also independent risk factors of disease-free survival. CONCLUSIONS: pTNM stage and ICGR15 may be simple and useful predictors to improve long-term survival and recurrence after curative hepatic resection for HCC.

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PubMedDate not supplied

Risk factors of intrahepatic recurrence after curative resection of hepatocellular carcinoma.

BACKGROUND/AIMS: Although the risk factors for the development of intrahepatic recurrence after hepatectomy for hepatocellular carcinoma (HCC) have been widely studied, little attention has been given to the prognostic factors affecting such patients. METHODOLOGY: Intrahepatic recurrence occurred in 105 (56%) of 188 patients who underwent curative hepatic resection of HCC and were discharged from the hospital. Among them, 17 (16%) also had simultaneous extrahepatic recurrence. Independent prognostic factors were evaluated by multivariate analysis using Cox's proportional hazards model. RESULTS: Multivariate analysis revealed that presence of extrahepatic recurrence, hepatitis B, and non-surgical treatments for recurrence were independent predictors of poor overall survival after initial hepatic resection or after recurrence. Risk factors of extrahepatic recurrence were young age, solitary and large HCC, high hepatitis activity, and large amount of intraoperative blood loss and blood transfusion. CONCLUSIONS: Survival of patients with intrahepatic recurrent HCC after resection should be stratified by the type of recurrence, type of hepatitis, and type of treatment for recurrence.

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