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  • 1
    ISSN: 1442-2042
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background: Nerve-sparing techniques are commonly used in retroperitoneal lymph node dissection (RPLND) in patients with early stage testicular germ cell tumors to preserve postoperative ejaculation. The indications for nerve-sparing procedures have been extended to patients who have residual retroperitoneal tumor postchemotherapy with an increase in the incidence of local recurrence. Here, we report on 26 Japanese men with advanced testicular cancer who underwent nerve-sparing RPLND after partially successful chemotherapy.Methods: Between January 1995 and December 2000, 26 patients with metastatic or recurrent testicular cancer underwent nerve-sparing RPLND after chemotherapy. Eight patients had seminoma and 18 had non-seminoma. Three patients received high-dose chemotherapy with carboplatin (250 mg/m2 per day × 5 days), etoposide (300 mg/m2 per day × 5 days) and ifosfamide (1.5 g/m2 per day × 5 days) in combination with peripheral blood stem cell transplantation.Results: In all cases, lumbar splanchnic nerves were preserved macroscopically during the operation, at least unilaterally. Twenty-two patients (84.6%) achieved antegrade ejaculation during a mean follow-up at 3.9 months (range: 1–7 months). Three patients have fathered children. Only one patient suffered a retroperitoneal recurrence during a median follow-up at 25.8 months (range: 6–76 months).Conclusion: Nerve-sparing procedures for RPLND are appropriate for patients with metastatic testicular cancer, even after chemotherapy. The procedure preserves ejaculatory function in the majority of the patients without increasing the risk of local recurrence. Nerve-sparing RPLND improves the quality of life in patients who require postchemotherapy RPLND to treat residual tumor.
    Materialart: Digitale Medien
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  • 2
    ISSN: 1442-2042
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background: The growth and progression of prostate cancer depends on the stromal-epithelial interaction which is under paracrine control. Hepatocyte growth factor (HGF), produced by mesenchymal cells, is a multifunctional growth factor stimulating the movement and growth of epithelial cells including cancer cells. We therefore assessed the relationship between the invasive potential of prostate cancer and HGF in vitro. Methods: Three human prostate cancer cell lines were used including PC-3 and DU145 (androgenindependent), and LNCaP (androgen-dependent). We studied the expression of the HCF receptor c-met proto-oncogene (c-met) by Western blotanalysis, and alsodetermined theeffectsof HGF on cell scattering, and the mechanisms of invasion and proliferation, by microscopic observation, the matrigel invasion chamber assay, and the MTT assay. Results: c-met was detected in PC-3 and DU145 cells, but not in the LNCaP cells. There was increased cell motility in the scatter assay and an increased cell invasive potential in the matrigel invasion chamber assay by stimulation with HGF only with DU145 cells. Conclusion: HGF plays an important role in the invasion and metastasis of the DU145 cell line through a paracrine mechanism mediated by the c-metreceptor. In the PC-3 cell line, the lack of downstream signal transduction after the c-met receptor is suggested.
    Materialart: Digitale Medien
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  • 3
    ISSN: 1442-2042
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background:Mice homozygousforthe jsd (juvenilespermatogonial depletion) allele are sterile because they become azoospermic. The onset of such azoospermia was investigated by histologic analysis of sections of testes from jsd/jsd mice. Method:The testes removed from C57BL/6-jsd/jsd mice aged 3 to 10 weeks were examined microscopically. Results:At 3 weeks of age, spermatocytes were seen in most of the seminiferous tubules of jsd/jsd mice. However, the number of tubules that contained spermatids was significantly smaller than that counted in the wild-type mice. Since degenerative figures were not abundant in the jsd/jsd testes, the decreased number of spermatids found in the tubules suggested a longer duration of development from spermatocyte to spermatid in jsd/jsd mice. The abnormality extended to the development of type B spermatogonia, and a decrease in their number became apparent after 6 weeks of age in most of the jsd/jsd tubules. However, as early as 3 weeks of age, a few seminiferous tubules in jsd/jsd mice already contained only Sertoli cells and type A spermatogonia. Conclusion:It is assumed that the decrease in type B spermatogonia occurred at various ages and locations. The defect of spermatogenesis in jsd/jsd mice was attributable to aberrations in multiple steps of spermatogenesis.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    Melbourne, Australia : Blackwell Science Pty
    International journal of urology 8 (2001), S. 0 
    ISSN: 1442-2042
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: A 73-year-old man with primary small cell carcinoma of the bladder underwent radical cystectomy. The pathological findings revealed the tumor confined to the submucosal layer (pT1) without metastasis. No adjuvant chemotherapy was carried out. He is alive with no evidence of the disease 24 months after the operation.
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    International journal of urology 5 (1998), S. 0 
    ISSN: 1442-2042
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background: Excellent treatment results are obtained for stage I testicular seminoma treated with orchiectomy and prophylactic radiotherapy. In patients with stage I nonseminomatous testicular tumors, surveillance alone is successful, however, this treatment option for stage I testicular seminomas is controversial. There have been few reports of long-term follow-up of surveillance alone for patients with stage I testicular seminoma. Methods: To assess the appropriateness of this treatment option, a retrospective survey of stage I testicular seminoma was undertaken. Twenty-seven patients who underwent prophylactic radiation therapy (RT group) and 41 patients followed only by surveillance (S group) after high orchiectomy were evaluated. Their follow-up consisted of frequent clinical examinations, abdominal CT scans, chest x-rays and serum tumor markers. Results: In the RT group, with a median follow-up period of 15 years, 1 patient (3.6%) had a recurrence in the lung at 4 months after orchiectomy and died, but the remaining 26 are alive with no evidence of disease (NED). In the S group, with a median follow-up period of 7.3 years, 5 (12.2%) relapsed in the retroperitoneal lymph nodes, but all are alive with NED following chemotherapy. The remaining 36 are all alive without recurrence (follow-up period, 38 to 132 months). Although the relapse rate in the S group was relatively higher than in the RT group, there was no significant difference between the 2 groups. Conclusion: If a frequent follow-up protocol is administered and followed by the patient, surveillance alone may be a recommended management for stage I testicular seminoma.
    Materialart: Digitale Medien
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  • 6
    ISSN: 1442-2042
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background: There has been a paucity of antitumor drugs that are active against renal tumors. Irinotecan hydrochloride (CPT-11), a DNA topoisomerase type 1 inhibitor, has demonstrated antitumor activity against human tumors, however, no antitumor effect of CPT-11 on renal tumors has been reported. The antitumor effect of CPT-11 was investigated on 2 human renal tumors (OUR-10 and OUR-20) heterotransplanted into nude mice. Methods: Tumor-bearing nude mice were given daily intraperitoneal injections of multiple anticancer drugs suspended in 0.2 ml_ of phosphate-buffered saline (PBS) 3 times at 3-day intervals. Control mice were injected with 0.2 mL of PBS. The antitumor effects were evaluated by calculating the T/C ratio (treated tumors/controls) of the tumor volume. Results: Among the 10 anticancer drugs tested, 50 mg/kg of CPT-11 showed an active antitumor effect on OUR-20 (T/C ratio 34). However, all drugs tested on OUR-10 failed to show antitumor activity. Conclusion: Since CPT-11 was effective in 1 of 2 renal tumors examined without severe toxicity, this drug could be a candidate for chemotherapy of renal cell carcinoma.
    Materialart: Digitale Medien
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  • 7
    ISSN: 1442-2042
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background:Transurethral visual laser ablation of the prostate (VLAP) has been established as an alternative method for the treatment of benign prostatic hyperplasia (BPH). However, most VLAP procedures utilize only a neodymium:yttrium-aluminum-gamet (Nd:YAC) laser. Since a potassiumtitenyl-phosphate (KTP) laser offers limited tissue penetration, KTP can be safely utilized to excise part of the obstructing prostatic tissue. This study assessed the interaction between KTP vaporization and YAG coagulative ablation to determine the safety and efficacy of VLAP utilizing a combined KTP/YAG treatment. Methods:Forty patients with bladder outlet obstruction secondary to BPH were treated with VLAP using a KTP/YAG laser. The laser light was delivered by an angle delivery device. Results:Most cases demonstrated a significant improvement in routine subjective and objective parameters (AUA symptom score, peak flow rate, average flow rate, and amount of residual urine). No significant complications relating to this procedure were reported, however, 4 patients experienced postoperative acute urinary retention. Conclusion:KTP/YAG laser ablation of the prostate is safe and effective for the treatment of BPH.
    Materialart: Digitale Medien
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  • 8
    ISSN: 1442-2042
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Abstract Background: An increasing number of pharmacologic agents that induce reversible androgen deprivation are available for neoadjuvant endocrine therapy (NET) for prostatic adenocarcinoma (PCA). If information about the regression pattern of PCA after NET is recognized, more effective decision-making for subsequent therapies such as prostatectomy and radiotherapy, will be possible.Methods: The extent and zonal distribution of PCA with or without NET were examined in totally embedded radical prostatectomy specimens obtained from 103 patients with PCA. Seventy-nine of the 103 patients received androgen deprivation therapy (castrated). The zonal location of PCA lesions (non-transition vs transition zone), was identified in three slices from the inferior, middle and superior parts of the prostate. The area of the PCA lesions in these zones was measured.Results: Prostatic adenocarcinoma was identified in 94 of 103 cases: 24 of 24 cases (100%) and 70 of 79 cases (87%) in the non-castrated and castrated groups, respectively. The NET induced a mean of 21% reduction of the prostate volume and lowered the serum PSA level by one eighth. The frequency of capsular penetration in the castrated cases (57%) was lower than in the non-castrated cases (83%) and confinement of the PCA lesion was found in 32% of the castrated and 17% of the non-castrated cases. The reduction rate of the extent of the PCA lesions in the non-transition and transition zone was 33% and 28%, respectively. The extent of the PCA lesions were smaller in the anterior parts, especially at the superior portion of the prostate.Conclusion: Neoadjuvant endocrine therapy induced involutional changes of the PCA evenly across both the non-transition and transition zones. The density of the PCA lesions was low in the anterior part of the prostate. This information is useful for decision-making in post-NET.
    Materialart: Digitale Medien
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  • 9
    ISSN: 1442-2042
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background : Human prostate-specific Ets (hPSE) belongs to the Ets family. It regulates the proliferation, differentiation, and development of prostate epithelial cells. A recent study showed that hPSE can be detected in normal glands but not in cell lines established from prostate cancer (PCA), suggesting a translational disorder of hPSE from mRNA to protein in PCA. Immunohistochemical detection of hPSE could therefore be another method of differential diagnosis of PCA from other proliferative conditions in the prostate.〈section xml:id="abs1-2"〉〈title type="main"〉 Methods :An immunohistochemical detection of hPSE was carried out on the whole mounted prostatectomy specimen obtained from 19 cases with PCA.〈section xml:id="abs1-3"〉〈title type="main"〉 Results :Basal and secretory luminar cells showed a diffuse cytoplasmic staining for hPSE in normal glands, hyperplastic glands, and prostate intraepithelial neoplasia lesions. Whereas approximately 30% of PCA lesions showed a negative staining for hPSE, the positive rate for hPSE between PCA and benign glands or prostate intraepithelial neoplasia (PIN), was statistically significant (P 〈 0.05). Staining intensities in normal glands, hyperplastic glands, and PIN lesions were similar, but generally stronger than those in PCA lesions.〈section xml:id="abs1-4"〉〈title type="main"〉 Conclusions :Negative immunoreactivity for hPSE strongly suggests malignancy in the prostate glands. Decreased immunoreactivities of glands for hPSE could suggest PCA.
    Materialart: Digitale Medien
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  • 10
    ISSN: 1432-2277
    Schlagwort(e): Key words Activator protein-1 ; Chronic rejection ; Electrophoretic mobility shift assay ; Glucocorticoid receptor ; Kidney transplantation ; Nuclear factor ϰB
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Although chronic rejection is the most common reason for late allograft loss, its pathophysiology and etiology are unclear. Attempts to prevent chronic rejection are now focused on the modulation of transcriptional regulation. We evaluated the ability of glucocorticoid receptors (GR) to bind to the DNA binding site in peripheral blood mononuclear cells (PBMC) of five patients with chronic rejection and seven without it. Using an electrophoretic mobility shift assay, we measured the amount of nuclear glucocorticoid receptor capable of binding to its specific DNA recognition sequences, termed glucocorticoid response elements (GRE). GR binding was significantly greater in control patients than in those with chronic rejection (P 〈 0.01). The retarded band was almost undetectable in two patients with chronic rejection even though they were taking more prednisolone than the seven control patients, all of whom had clearly identifiable retarded bands. These results suggest a decreased ability of GR to bind to GRE in chronic rejection, resulting in a reduced ability to block key proinflammatory promoter sites. This reduced binding may be one molecular basis of chronic rejection.
    Materialart: Digitale Medien
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