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1.
Clin Transl Radiat Oncol ; 21: 120-126, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32090176

RESUMO

BACKGROUND AND PURPOSE: The aim of this survey was to invite radiation oncologists to self-assess whether sexual health care and sexual dysfunction are an issue in daily routine. MATERIALS AND METHODS: At the annual congress of the Austrian Society of Radiation Oncology in 2017 doctors were asked about their care for sexual health in cancer patients by using questionnaires. No exclusion criteria were employed. Forty-one questionnaires were answered and statistically analysed so 44.5% of doctors participated. RESULTS: Only 4.9% of the participants self-assessed to routinely explore sexual health issues in 61-80% of their patients. Thirty-one point seven percent of the doctors suspected sexual problems in about half of their patients but did not raise the issue. The most common reason for not raising sexual issues by the patients was assumed by the doctors "other problems are more important" (73.2%), followed by "lack of time" (36.6%). Participants were also asked about additional medical qualifications: none of the physicians had training in sexual medicine. CONCLUSION: The main reason for not talking about sexual problems was the impression of the participating doctors that other problems were more important for the patients. Another reason for not bringing up the topic of sexual issues by the patients was assumed by the doctors: lack of time. As doctor shortage is a problem in the observed country other kind of networks and counselling possibilities should be evaluated. An interesting finding was that survey participants show a higher awareness for male sexual problems than for female issues.

2.
Biochim Biophys Acta ; 1282(1): 131-9, 1996 Jun 13.
Artigo em Inglês | MEDLINE | ID: mdl-8679650

RESUMO

Mechanisms of intracellular pH (pHi) regulation seem to be involved in cellular growth and cell division. Little is known about how extracellular acidosis, known to occur in central regions of solid tumors, or alkaline conditions affect pHi regulation in colonic tumors. pHi changes in the colonic adenocarcinoma cell-line SW-620 were recorded by spectrofluorimetric monitoring of the pH-sensitive, fluorescent dye BCECF, and proliferative activity was assessed by [3H]thymidine uptake. Resting pHi in Hepes-buffered solution was 7.53 +/- 0.01 (n = 36). Both 1 mM amiloride and Na(+)-free solution inhibited pHi recovery from acidification and decreased pHi in resting cells. In HCO3-/CO2-buffered media resting pH1 was 7.42 +/- 0.01 (n = 36). Recovery from acidification was Na(+)-dependent, CI(-)-independent, and only partially blocked by 1 mM amiloride. In the presence of amiloride and 200 microM H2DIDS pHi recovery was completely inhibited. In Na(+)-free solution pHi decreased from 7.44 +/- 0.04 to 7.29 +/- 0.03 (n = 6) and no alkalinization was observed in CI(-)-free medium. Addition of 5 microM tributyltin bromide (an anion/OH-exchange ionophore) caused pHi to decrease from 7.43 +/- 0.05 to 7.17 +/- 0.08 (n = 5). The effects of pH0 on steady-state pHi, pHi recovery from acidification and proliferative activity after 48 h were investigated by changing buffer [CO2] and [HCO3-]. In general, increases in pH0 between 6.7 and 7.4 increased pHi recovery, steady-state pHi and growth rates. In summary, SW-620 cells have a resting pHi > 7.4 at 25 degrees C, which is higher than other intestinal cells. Acid extrusion in physiological bicarbonate media is accomplished by a pHi-sensitive Na+/H+ exchanger and a pHi-insensitive Na(+)-HCO3-cotransporter, both of which are operational in control cells at the resting pHi. No evidence for activity of a CI-/HCO3- exchanger was found in these cells, which could account for the high pHi observed and may explain why the cells continue to grow in acidic tumor environments.


Assuntos
Neoplasias do Colo/metabolismo , Neoplasias do Colo/patologia , Ácido 4,4'-Di-Isotiocianoestilbeno-2,2'-Dissulfônico/farmacologia , Amilorida/farmacologia , Bicarbonatos/farmacologia , Dióxido de Carbono/farmacologia , Proteínas de Transporte/metabolismo , Divisão Celular , Cloretos/administração & dosagem , Cloretos/farmacologia , Humanos , Concentração de Íons de Hidrogênio , Sódio/administração & dosagem , Sódio/farmacologia , Simportadores de Sódio-Bicarbonato , Trocadores de Sódio-Hidrogênio/metabolismo , Compostos de Trialquitina/farmacologia , Células Tumorais Cultivadas
3.
Int J Oncol ; 19(5): 1069-74, 2001 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-11605011

RESUMO

Aromatic fatty acids such as phenylbutyrate (PB) and its metabolite phenylacetate (PA) induce growth arrest, differentiation and apoptosis in solid tumor cells. Despite their antiproliferative action they were reported to exhibit a synergistic effect in combination with cytotoxic drugs like topotecan, and others. Since the activity of the camptothecines (CPTs) depends on local pH conditions, we investigated, whether PB/PA modulate CPT effects indirectly by affecting intracellular pH in SW620 and SW480 colon cancer cells. The results for the colon carcinoma cells show an antagonistic interaction for the combination of CPT and 0.25-5 mM PA in viability assays, resulting in an approximately 3-fold increase in IC50 (control: 20+/-7 nM). A synergistic effect with significantly increased numbers of late apoptotic/necrotic cancer cells (difference +21+/-4%) and 1.4-fold sensitization were detected upon inclusion of 2.5 mM PA during a 4-h CPT (10 micro;M) loading phase. In response to 0.25-1 mM PA/PB the cells exhibit a reversible decrease of pHi (0.1-0.31 pH units) in HEPES- or bicarbonate-buffered media. Dose-dependent acidification and pHi-recovery occurred following addition of PA and PB after an acid load and inhibition of the Na+/H+-antiporter and bicarbonate exchangers, pointing to a possible intracellular mechanism of cytoplasmic acidification. It is concluded that the synergistic modulation of CPT toxicity by short-term PA/PB treatment in colon carcinoma cells is caused by changes in intracellular pH, possibly affecting quantity and localization of the active closed lactone form of this drug.


Assuntos
Antineoplásicos Fitogênicos/farmacologia , Camptotecina/farmacologia , Diferenciação Celular/efeitos dos fármacos , Neoplasias do Colo/tratamento farmacológico , Fenilacetatos/farmacologia , Fenilbutiratos/farmacologia , Anexina A5/metabolismo , Apoptose/efeitos dos fármacos , Bicarbonatos/química , Ciclo Celular/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Resistencia a Medicamentos Antineoplásicos , Glutamina/química , Humanos , Concentração de Íons de Hidrogênio , Técnicas In Vitro , Células Tumorais Cultivadas
4.
Int J Oncol ; 23(5): 1269-75, 2003 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-14532965

RESUMO

The aim of this study was to investigate the activation of the p53 pathway and the induction of apoptosis during preoperative radiotherapy in normal human rectal tissue and in rectal carcinoma. Twelve patients with rectal cancer of the lower third were enrolled in this study. Tumor specimens and adjacent normal tissue were obtained before radiation, after the third radiation cycle and from the surgically removed rectum. All specimens were analyzed be means of immunohistochemistry for expression of p53 and its downstream target genes MDM2 and p21. In normal mucosal crypts, irradiation led to p53 accumulation and MDM2 induction in more than 70% of the cells. The accumulation of p53 in basal crypts was associated with high expression of p21. Apoptosis was also induced in crypts and occurred in 15% of the cells. Activation of the p53 pathway was not seen in the resting cells at the luminal border of the epithelium. In interstitial cells, p21 was highly upregulated, whereas p53 and MDM2 showed weak expression. The level of bcl-2 was not altered during radiotherapy in healthy tissue. In rectal carcinoma cells, p53 expression was unaltered by irradiation in 11 out of 12 tumors. The p53 non-functional tumors were characterized by a weak induction of MDM2 and p21 and by the lack of apoptosis in the presence of bcl-2. Our findings demonstrate that sequential immunohistochemical analysis is suitable to detect a deregulation of the p53 pathway in human rectal cancer cells during radiotherapy. Further investigations are necessary to elucidate its value as a prognostic marker and potential predictor of therapy responsiveness.


Assuntos
Carcinoma/radioterapia , Radioterapia/métodos , Neoplasias Retais/radioterapia , Proteína Supressora de Tumor p53/metabolismo , Idoso , Apoptose , Biópsia , Carcinoma/patologia , Divisão Celular , Linhagem Celular Tumoral , DNA/metabolismo , Análise Mutacional de DNA , Feminino , Humanos , Imuno-Histoquímica , Antígeno Ki-67/biossíntese , Masculino , Pessoa de Meia-Idade , Mucosa/patologia , Mutação , Proteínas Nucleares/metabolismo , Reação em Cadeia da Polimerase , Prognóstico , Proteínas Proto-Oncogênicas/metabolismo , Proteínas Proto-Oncogênicas c-bcl-2/metabolismo , Proteínas Proto-Oncogênicas c-mdm2 , Proteínas Proto-Oncogênicas p21(ras)/metabolismo , Neoplasias Retais/patologia , Fatores de Tempo , Regulação para Cima
5.
J Cancer Res Clin Oncol ; 114(2): 191-6, 1988.
Artigo em Inglês | MEDLINE | ID: mdl-3350852

RESUMO

Natural killer (NK) cell activity against K 562 erythroleukemic- and MCF-7 breast carcinoma-derived cells was monitored in short-term (3 h/K 562) and long-term (18 h/MCF-7) chromium release tests for 60 patients with untreated primary breast disease. Target cell lysis was the same for patient groups with benign (n = 13) and malignant (n = 47) breast disease (27% versus 36% mean chromium release; target:effector ratio 40:1 for K 562 and 28% versus 40% for MCF-7 cells). NK activity as defined by short-term lysis of K 562 cells did not correlate with MCF-7 cell lysis in long-term assays for the carcinoma patients. This functional heterogeneity of natural cytotoxic activities of breast cancer patients was confirmed by a different age distribution for K 562 and MCF-7 cell lysis and high levels of MCF-7-directed NK activity in the grade I tumor group (56.2%). Our results indicate that measurement of peripheral blood NK activity against a breast carcinoma-derived cell line (MCF-7) defines a disease-related natural cytotoxic activity which correlates better with prognostic tumor parameters (tumor grading) than NK activity as defined by the lysis of K 562 erythroleukemic cells. NK activity testing against breast carcinoma cell lines should be used to monitor natural cytotoxic activities in breast cancer patients and its modulation by different routes of treatment.


Assuntos
Neoplasias da Mama/imunologia , Células Matadoras Naturais/imunologia , Adulto , Fatores Etários , Idoso , Idoso de 80 Anos ou mais , Fenômenos Fisiológicos Sanguíneos , Neoplasias da Mama/análise , Neoplasias da Mama/patologia , Citotoxicidade Imunológica , Feminino , Humanos , Linfonodos/imunologia , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Receptores de Estrogênio/análise , Receptores de Progesterona/análise
6.
Am J Clin Pathol ; 88(4): 399-404, 1987 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-3661495

RESUMO

Fine-needle aspirates (FNAs) of 84 primary breast carcinomas were analyzed immunocytochemically for estrogen receptor (ER) using (ER-ICA) monoclonal antireceptor antibodies. ER-ICA in FNAs was concordant to ER-ICA in histologic biopsies in 87% (P less than 0.0001). In most of the carcinomas, biochemically determined ER status also correlated to ER-ICA. There was no false positive ER-ICA in FNAs compared with ER-ICA in histologic biopsies. In 11 FNAs, ER-ICA was negative, whereas it showed positivity in histologic specimens. The most frequent contributing factors to false negative ER-ICAs of FNAs were ER-ICA-low results in histologic biopsies, a prominent stroma component in these tumors, and low cellularity of FNAs. The biochemical ER values in these cases never exceeded 90 fmol/mg protein. In a minority of cases, false negative results were inexplicable.


Assuntos
Neoplasias da Mama/análise , Carcinoma in Situ/análise , Receptores de Estrogênio/imunologia , Anticorpos Monoclonais/imunologia , Biópsia por Agulha , Neoplasias da Mama/patologia , Carcinoma in Situ/patologia , Reações Falso-Negativas , Feminino , Humanos , Imuno-Histoquímica
7.
Virchows Arch ; 437(3): 241-7, 2000 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-11037343

RESUMO

Abrogation of the normal p53 pathway is the most common molecular alteration in human cancer. p53 Gene status can be potentially assessed through the expression of proteins known to be activated by the wild-type p53 (wt p53) system, such as mdm2 and p21Waf1/Cip1. In this study, the frequency of mdm2, p21Waf1/Cip1, and p53 protein expression was investigated using immunohistochemistry (IHC) in 88 colorectal carcinomas (CRCs). The relationship between these expressions and p53 status was examined. p53 status and the immunophenotypes characterizing these tumors were correlated with standard prognostic variables. Mutation of p53 was detected using single-strand conformational polymorphism (SSCP) analysis and sequencing. Concordance between p53 gene status and p53 immunoreactivity was seen in 62 of 88 (70.45%) carcinomas. Mdm2 expression was found in 22 of 45 (48.88%) and 5 of 43 (11.62%) of the tumors with wt p53 and mutated p53 (P<0.0001), respectively. Predominantly, higher p21Waf1/Cip1 expression was associated with wt p53 (P<0.001). All wt p53 cases that expressed mdm2 also expressed p21Waf1/Cip1. These results suggest that there is a subgroup of CRCs in which p53 is functionally active, inducing transcription of mdm2 and Waf1/Cip1. Their combined evaluation may provide important clues for planning adjuvant systemic therapy and gene therapy based on the restitution of p53 function. However, no significant association was found between the immunophenotypes and the standard prognostic variables investigated.


Assuntos
Neoplasias Colorretais/genética , Ciclinas/análise , Genes p53 , Proteínas Nucleares , Proteínas Proto-Oncogênicas/análise , Proteína Supressora de Tumor p53/análise , Adulto , Idoso , Idoso de 80 Anos ou mais , Neoplasias Colorretais/química , Inibidor de Quinase Dependente de Ciclina p21 , Feminino , Humanos , Imuno-Histoquímica , Masculino , Pessoa de Meia-Idade , Proteínas Proto-Oncogênicas c-mdm2
8.
Arch Surg ; 133(10): 1076-83, 1998 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-9790204

RESUMO

OBJECTIVES: To evaluate and compare outcomes and complications in patients having undergone gastrostomy by surgical (SG), percutaneous endoscopic (PEG), or percutaneous radiological (PRG) procedure. DESIGN: Retrospective analysis. SETTING: University-based tertiary care center. PATIENTS: Of 82 patients who met inclusion criteria, 14 patients (median age, 40 years) received a surgical tube placement (SG), in 24 patients (median age, 55 years) a PEG procedure was performed, and in 44 patients (median age, 57 years) the tube was placed under fluoroscopic guidance (PRG). Indications for gastrostomy were similar in all groups, representing mainly cancer of the oropharyngeal, head and neck region (51 [61%]) as well as the upper gastrointestinal tract (6 [8%]), neurological disorders (15 [18%]), and others (10 [13%]). MAIN OUTCOME MEASURES: Catheter function rates, major and minor procedure-related complications, and survival. RESULTS: Median follow-up was 17.2 months. Ten patients (71%) died in the SG group 7 to 855 days (median, 67 days) after the procedure, 7 patients (29%) died 5 to 263 days (median, 103 days) after PEG placement, and 30 patients (68%) died within 3 to 621 days (median, 112 days) after PRG, of their underlying disease or disease-related complications; 1 procedure-related death occurred 6 days after radiological tube placement. We observed a rate of minor complications of 43% (6 patients), 33% (8), and 36% (16) and a major complication rate of 14% (2 patients), 17% (4), and 11% (5) in the SG, PEG, and PRG groups, respectively. Tube function rates at 1 year were 67% (9 patients) and 68% (20) in the SG and PEG groups, respectively, and 10% lower (39) in the PRG group, although the difference was not statistically significant. CONCLUSIONS: There is no major difference between SG, PEG, and PRG concerning procedure-related complications. Tube function tends to be inferior after radiological tube placement.


Assuntos
Endoscopia , Gastrostomia/métodos , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Criança , Pré-Escolar , Endoscopia/efeitos adversos , Endoscopia/mortalidade , Feminino , Seguimentos , Gastrostomia/efeitos adversos , Gastrostomia/mortalidade , Humanos , Lactente , Recém-Nascido , Masculino , Pessoa de Meia-Idade , Complicações Pós-Operatórias/epidemiologia , Radiologia Intervencionista , Estudos Retrospectivos , Taxa de Sobrevida , Fatores de Tempo , Resultado do Tratamento
9.
Arch Surg ; 131(10): 1103-7; discussion 1108, 1996 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-8857912

RESUMO

OBJECTIVES: To examine the patency and limb-salvage characteristics of vascular reconstruction in patients with sarcomas of the lower extremity who had been treated with limb-preserving resection and to examine patient survival during a long follow-up period. DESIGN: Retrospective cohort study. SETTING: University hospital, tertiary referral center. PATIENTS: From 1984 to 1992, 14 patients underwent limb-preserving resection of sarcomas in the proximal lower extremity, with 20 vascular reconstructions performed. OUTCOME MEASURES: Color Doppler scans documented patency of the vascular reconstructions. Clinical evaluation included functional results in terms of limb movement and quality of life. Local tumor control and systemic recurrence were examined by repeated radiologic examination. Overall survival as well as time and cause of death were assessed. RESULTS: A total of 13 patients had patent vascular grafts, while the venous graft became occluded in 1 patient. Limb function was rated as excellent or good in 9 patients, as fair in 3, as poor in 1, and could not be clinically estimated in 1. Postoperative thrombosis of the venous graft was detected in 3 patients and was effectively managed by thrombectomy in 2. Three patients underwent reoperation because of hematoma or complications caused by local infection. The tumor endoprosthesis had to be replaced in 3 patients. During follow-up periods that ranged from 15 to 132 months (mean, 55 months), 4 patients died. In all of these patients the cause of death was systemic recurrence in the lung. Two additional patients developed pulmonary metastases, but at the time of this report, they were still alive as long as 132 months after operative resection or chemotherapy. No local recurrence was found. CONCLUSION: Limb-preserving resection of sarcoma of the lower extremity can be performed with satisfactory function of the limb maintained, even if it becomes necessary to resect the femoral vessels. Autologous venous graft for vascular reconstruction is the treatment of choice. In spite of the high incidence of metastases, considerable long-term survival is possible.


Assuntos
Neoplasias Ósseas/cirurgia , Perna (Membro)/irrigação sanguínea , Sarcoma/cirurgia , Procedimentos Cirúrgicos Vasculares , Adolescente , Adulto , Idoso , Feminino , Humanos , Perna (Membro)/cirurgia , Masculino , Pessoa de Meia-Idade , Complicações Pós-Operatórias , Estudos Retrospectivos , Grau de Desobstrução Vascular
10.
Cancer Chemother Pharmacol ; 34(2): 125-32, 1994.
Artigo em Inglês | MEDLINE | ID: mdl-7910786

RESUMO

The ability of the multidrug resistance modifiers R- and R,S-verapamil (VPL), cyclosporine A (CsA) and its non-immunosuppressive derivative SDZ PSC 833 (PSC 833) to inhibit P-glycoprotein (P-gp)-mediated transepithelial flux of tritiated vinblastine was investigated using tight and highly resistant (R > 1,400 omega cm2) monolayer cultures of intestinal adenocarcinoma-derived HCT-8 cells grown on permeable tissue-culture inserts. Apical addition of these chemosensitizers inhibited drug flux (137 pmol h-1 cm-2; range, 133-142 pmol h-1 cm-2) in the basal to apical secretory direction at clinically relevant concentrations, with PSC 833 showing the highest activity, exhibiting inhibition at concentrations as low as 10 ng/ml (9 nM). Acidification of the modulator-containing apical compartment to an extracellular pH (pHo) of 6.8 had no influence on MDR reversal by CsA at 1 microgram/ml (0.9 microM; flux inhibition, 52%) or by PSC 833 at 100 ng/ml (0.09 microM; flux inhibition, 60%), in contrast to R,S- and R-VPL, which showed decreased inhibition and caused less accumulation of vinblastine in HCT-8 cells under this condition (flux inhibition of 35% and 23%, respectively, at pHo 6.8 vs 50% and 43%, respectively, at pHo 7.5). P-gp-mediated rhodamine 123 efflux from dye-loaded single-cell suspensions of HCT-8 cells as measured by flow cytometry was not impeded at pHo 6.8 in comparison with pHo 7.5 in standard medium, but at low pHo the inhibitory activity of R-VPL (29% vs 60% rhodamine 123 efflux inhibition) was diminished significantly, again without a reduction in the effect of PSC 833 (rhodamine 123 flux inhibition, 75%). In conclusion, drug extrusion across polarised monolayers, which offer a relevant model for normal epithelia and tumour border areas, is inhibited by the apical presence of R,S- and R-VPL, CsA and PSC 833 at similar concentrations described for single-cell suspensions, resulting in increased (2.2- to 3.7-fold) intracellular drug accumulation. Functional apical P-gp expression, the absence of paracellular leakage and modulator-sensitive rhodamine 123 efflux in single HCT-8 cells indicate a P-gp-mediated transcellular efflux in HCT-8 monolayers. In addition to its high MDR-reversing capacity, the inhibitory activity of PSC 833 is not affected by acidic extracellular conditions, which reduce the VPL-induced drug retention significantly. As far as MDR contributes to the overall cellular drug resistance of solid tumours with hypoxic and acidic microenvironments, PSC 833 holds the greatest promise for clinical reversal of unresponsiveness to the respective group of chemotherapeutics.


Assuntos
Adenocarcinoma/metabolismo , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Proteínas de Transporte/antagonistas & inibidores , Neoplasias do Íleo/metabolismo , Valva Ileocecal , Glicoproteínas de Membrana/antagonistas & inibidores , Proteínas de Neoplasias/antagonistas & inibidores , Vimblastina/antagonistas & inibidores , Membro 1 da Subfamília B de Cassetes de Ligação de ATP , Adenocarcinoma/tratamento farmacológico , Transporte Biológico/efeitos dos fármacos , Proteínas de Transporte/efeitos dos fármacos , Proteínas de Transporte/metabolismo , Ciclosporina/administração & dosagem , Ciclosporinas/administração & dosagem , Depressão Química , Resistência a Medicamentos , Ensaios de Seleção de Medicamentos Antitumorais , Humanos , Concentração de Íons de Hidrogênio , Neoplasias do Íleo/tratamento farmacológico , Glicoproteínas de Membrana/efeitos dos fármacos , Glicoproteínas de Membrana/metabolismo , Proteínas de Neoplasias/efeitos dos fármacos , Proteínas de Neoplasias/metabolismo , Células Tumorais Cultivadas/efeitos dos fármacos , Células Tumorais Cultivadas/metabolismo , Verapamil/administração & dosagem , Vimblastina/farmacocinética
11.
Anticancer Res ; 13(6A): 2059-63, 1993.
Artigo em Inglês | MEDLINE | ID: mdl-7905252

RESUMO

In this study we have investigated the effects of the multidrug-resistance (MDR) modifiers verapamil (VPM), cyclosporin A (CsA) and tamoxifen (TMX) on the intracellular pH(pHi) of four colon carcinoma-derived cell lines with low P-glycoprotein expression (CaCo-2, HT-29, SW 620 and SW 480). Addition of VPM (1 mu M), CsA (1 microgram/ml) or TMX (2 microM) in HEPES- or bicarbonate/CO2-buffered Ringer's solution was followed by dose-dependent and reversible decreases of the pHi (0.1-0.3 units) of all cell lines, as measured ratiometrically by the changes in the pH-dependent fluorescence of bis(carboxyethyl)carboxyfluorescein (BCECF). Testing the effects of the resistance modifiers on the Na+/H+ antiporter and bicarbonate trans-porters under appropriate buffer conditions and addition of inhibitors (amiloride, DIDS) revealed that the chemomodulator-induced acidification does not interfere with the function of these major pHi-regulating acid-base transporters. The induction of changes in pHi shows no correlation with MDR-reversing activity of the drugs and our data do not support the P-gp-inhibition-mediated accumulation of acidic substrates as underlying mechanism. In addition to the P-gp-directed MDR-reversal, chemomodulator-induced intracellular acidification may enhance the chemosensitivity of the cells especially under alkaline extracellular conditions, and contribute to the decreased efficacy of MDR-modifiers in acidic extracellular environments and to the chemosensitising effect of VPM in P-gp-negative cell lines.


Assuntos
Proteínas de Transporte/biossíntese , Ciclosporina/farmacologia , Resistência a Medicamentos/fisiologia , Concentração de Íons de Hidrogênio , Glicoproteínas de Membrana/biossíntese , Tamoxifeno/farmacologia , Verapamil/farmacologia , Membro 1 da Subfamília B de Cassetes de Ligação de ATP , Adenocarcinoma , Amilorida/farmacologia , Divisão Celular/efeitos dos fármacos , Linhagem Celular , Sobrevivência Celular/efeitos dos fármacos , Neoplasias do Colo , Doxorrubicina/toxicidade , Humanos , Cinética , Células Tumorais Cultivadas
12.
J Infect ; 26(2): 133-46, 1993 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-8473760

RESUMO

Sixty-five patients with Candida albicans fungaemia, admitted to intensive care units, were treated intravenously with fluconazole. All patients had at least one blood culture which was positive for C. albicans. The first group of 34 consecutive patients received fluconazole at a dose of 5 mg/kg bodyweight/day and the subsequent 31 patients received 10 mg/kg/day. Thirty patients in each group were evaluated. The clinical response rate was 60% in the 5 mg/kg once daily group and 83% in the group which received 10 mg/kg/day. Eradication of C. albicans from the blood was achieved in all but two patients in the 5 mg/kg group and in all patients in the 10 mg/kg group. As regards other sites of infection, eradication was achieved in only nine of 25 cases from the 5 mg/kg group and in 11 of 23 cases from the 10 mg/kg group. Death related to fungal infection occurred in eight patients receiving 5 mg/kg/day and in one patient receiving 10 mg/kg/day. Fluconazole was reasonably well tolerated. Raised concentrations of liver enzymes were observed in 14 patients. Other adverse effects were fatigue, nausea, gastric pain, sleepiness and epileptic seizure. In conclusion, fluconazole at a dose of 10 mg/kg/day would seem to be an effective and safe drug for the management of C. albicans fungaemia.


Assuntos
Candidíase/tratamento farmacológico , Fluconazol/uso terapêutico , Fungemia/tratamento farmacológico , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Candidíase/microbiologia , Esquema de Medicação , Feminino , Fluconazol/administração & dosagem , Fluconazol/efeitos adversos , Fungemia/microbiologia , Humanos , Injeções Intravenosas , Masculino , Pessoa de Meia-Idade , Recidiva , Falha de Tratamento
13.
Nucl Med Commun ; 18(8): 710-8, 1997 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-9293501

RESUMO

Planar scintimammography (SMM) with 99Tcm-sestamibi (99Tcm-MIBI) has proved to be a useful method in the evaluation of breast lesions. The aim of our study was to determine the diagnostic value of planar and single photon emission tomograpic (SPET) SMM in different age group. We investigated women with breast lesions for which the surgeon recommended biopsy or careful follow-up. Seventy consecutive patients underwent supine planar SMM, while supine SPET was performed in 68 of the patients. Twenty-seven carcinomas in 23 patients and 35 benign lesions in 31 patients were confirmed histologically. In the remaining 16 patients, the findings were classified as benign at follow-up. The carcinomas and benign lesions had a mean (+/- S.D.) diameter of 25 +/- 17 and 17 +/- 11 mm respectively (P < 0.05). A sensitivity/specificity of 67/96% and 88/91% was obtained with the planar and SPET techniques respectively. The accuracy of both techniques was 90%. In patients aged 40 years or less, SPET increased the sensitivity from 50 to 100% (P < 0.01), whereas it decreased the specificity and accuracy from 94 to 81% and 91 to 81% respectively (N.S.). In patients aged 41-50 years, the sensitivity increased from 63 to 100% (P < 0.01), whereas there was a small decrease in specificity and an increase in accuracy (from 91 to 89% and 86 to 91% respectively, N.S.) We conclude that, in younger patients, a negative SPET SMM study indicates the need for careful follow-up rather than biopsy. However, the addition of SPET in supine scintimammography does-not change the overall accuracy significantly.


Assuntos
Neoplasias da Mama/diagnóstico por imagem , Tecnécio Tc 99m Sestamibi , Tomografia Computadorizada de Emissão de Fóton Único , Tomografia Computadorizada de Emissão , Adulto , Fatores Etários , Idoso , Neoplasias da Mama/patologia , Diagnóstico Diferencial , Feminino , Humanos , Metástase Linfática , Pessoa de Meia-Idade , Metástase Neoplásica , Estadiamento de Neoplasias
14.
J Cardiovasc Surg (Torino) ; 32(3): 334-9, 1991.
Artigo em Inglês | MEDLINE | ID: mdl-2055931

RESUMO

A clinical series has been analysed to determine which of two similar, extrathoracic "extraanatomic" methods of treating proximal blocks of the subclavian artery is the superior option. From 1975 until 1988 direct carotid-subclavian anastomosis was used in 32 patients and carotid-subclavian bypass in 19. There were no statistically significant differences for the probability of postoperative survival (p less than 0.877 Breslow; p less than 0.774 Mantel), intraoperative blood loss or the duration of anaesthesia. Those patients who had undergone subclavian artery repair had a significantly longer survival than those following carotid bifurcation endarterectomy (p less than 0.002 Breslow, p less than 0.0002 Mantel). As patients with subclavian lesions have a reasonable life-expectancy, they may possibly experience late complications of their vascular repair. Therefore it seems important to select the most durable operation, and direct carotid subclavian anastomosis has a significantly greater patency rate than bypass (p less than 0.006 Breslow, p less than 0.006 Mantel). Patients with preoperative symptoms of cerebrovascular insufficiency had a lower probability of survival than those with upper extremity claudication, although this did not reach statistical significance (p less than 0.205 Breslow; p less than 0.198 Mantel).


Assuntos
Arteriopatias Oclusivas/cirurgia , Artérias Carótidas/cirurgia , Artéria Subclávia/cirurgia , Procedimentos Cirúrgicos Vasculares/métodos , Adulto , Idoso , Anastomose Cirúrgica , Braço/irrigação sanguínea , Arteriopatias Oclusivas/complicações , Feminino , Humanos , Claudicação Intermitente/etiologia , Claudicação Intermitente/cirurgia , Masculino , Pessoa de Meia-Idade , Síndrome do Roubo Subclávio/etiologia , Síndrome do Roubo Subclávio/cirurgia , Taxa de Sobrevida , Grau de Desobstrução Vascular
15.
Wien Klin Wochenschr ; 105(9): 250-4, 1993.
Artigo em Alemão | MEDLINE | ID: mdl-8390127

RESUMO

A prospective study was undertaken in 17 patients undergoing restorative proctocolectomy for ulcerative colitis (13 patients) or familial adenomatous polyposis (4 patients) to determine relationship between pre- and postoperative anal sphincter function, pouch characteristics and functional results. Postoperatively all manometric parameters were significantly reduced and remained so permanently. Only squeeze pressure rose to normal values again. The most important factor for a favourable functional outcome was pouch volume. A capacious reservoir was associated with a low stool frequency, low risk of incontinence and general success of the operation, as assessed subjectively. Perianal soreness with considerable skin problems occurred frequently when resting and squeeze pressures were markedly reduced postoperatively.


Assuntos
Polipose Adenomatosa do Colo/cirurgia , Colite Ulcerativa/cirurgia , Incontinência Fecal/fisiopatologia , Complicações Pós-Operatórias/fisiopatologia , Proctocolectomia Restauradora/métodos , Polipose Adenomatosa do Colo/fisiopatologia , Adolescente , Adulto , Canal Anal/fisiopatologia , Criança , Colite Ulcerativa/fisiopatologia , Incontinência Fecal/prevenção & controle , Feminino , Seguimentos , Humanos , Masculino , Manometria , Complicações Pós-Operatórias/prevenção & controle , Estudos Prospectivos , Qualidade de Vida
16.
Int Surg ; 73(4): 218-20, 1988.
Artigo em Inglês | MEDLINE | ID: mdl-2978036

RESUMO

A randomized prospective study comparing PTFE-Y and Dacron-Y-grafts with regard to function rate, morphology, hemodynamic differences along the proximal anastomosis and body of the graft, complications and quality of material was performed. Between March 1983 and February 1987, 112 patients were admitted to the study. Randomization including the criteria of age, sex, indication to operation (chronic occlusive disease, aneurysm) run-off, diabetes, nicotine consumption and operative approach (transperitoneal, retroextraperitoneal) followed the methods of adaptive randomization developed by Pocock and Simon and was well balanced. Function rate and complications as well as morphological alterations showed no significant differences in either group. During a mean observation period of 24 months, Group I yielded a 97% and Group II a 95% function rate (Kaplan-Meier). In all patients but one in each group with limb graft occlusions (n = 5) function was regained by successful thrombectomy and profundaplasty. With respect to Doppler ultrasound differences in flow pattern, in four patients with enlarged proximal side-end anastomosis and adequate--not to large--incision is recommended performing the proximal anastomosis.


Assuntos
Aorta Abdominal/cirurgia , Prótese Vascular , Artéria Femoral/cirurgia , Artéria Ilíaca/cirurgia , Polietilenotereftalatos , Politetrafluoretileno , Anastomose Cirúrgica , Aneurisma Aórtico/fisiopatologia , Aneurisma Aórtico/cirurgia , Arteriopatias Oclusivas/fisiopatologia , Arteriopatias Oclusivas/cirurgia , Feminino , Oclusão de Enxerto Vascular , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Distribuição Aleatória
17.
Chirurg ; 59(3): 159-64, 1988 Mar.
Artigo em Alemão | MEDLINE | ID: mdl-3371129

RESUMO

The surgical treatment of bone tumors today results more and more in a radical resection therapy. The major vessels are often included in the tumor mass and therefore they have to be resected and reconstructed. Between 1981-1986 30 patients of the Orthopaedic University Clinic in Vienna were treated with tumor resection. The arterial and/or venous reconstruction was done in cooperation with the I. Department of Surgery of the University of Vienna. In 73% of the cases rotation plasty of the knee was performed, in 10% a local tumor resection and in 7% a tumor resection and reconstruction by a tumor endoprosthesis (KMFTR-system). Three patients underwent partial pelvic resection, hemipelvectomy and rotation plasty of the hip respectively.


Assuntos
Neoplasias Ósseas/cirurgia , Osso e Ossos/irrigação sanguínea , Microcirurgia/métodos , Adolescente , Adulto , Idoso , Artérias/cirurgia , Membros Artificiais , Prótese Vascular , Criança , Feminino , Humanos , Perna (Membro)/cirurgia , Masculino , Pessoa de Meia-Idade , Próteses e Implantes , Veias/cirurgia
20.
Acta Chir Iugosl ; 53(2): 109-12, 2006.
Artigo em Inglês | MEDLINE | ID: mdl-17139896

RESUMO

PURPOSE: A complication after restorative rectal surgery with a straight anastomosis is low-anterior resection syndrome with a postoperatively deteriorated anorectal function. The colonic J-reservoir is sometimes used with the purpose of reducing these symptoms. An alternative method is to use a simple side-to-end anastomosis or a coloplasty. MATERIAL AND METHODS: Three-hundred fiftyseven patients with rectal cancer undergoing total mesorectal excision (TME). Three-hundred (84.0%) received a low anterior resection with primary anastomosis and colo-rectal n = 194 (64.6%) or colo-anal anastomosis n = 106 (35.3%). A colonic pouch using the descending colon was created in 24 patients and in 75 patients respectively. Surgical results and complications were recorded. Patients were followed with a functional evaluation at 6 and 12 months postoperatively. RESULTS: Patient characteristics in both groups were very similar regarding gender, age, tumor level, and Dukes' stages. A large proportion of the patients received short-term preoperative radiotherapy (72%). There was no significant difference in surgical outcome between the 2 techniques with respect to anastomotic height, perioperative blood loss, postoperative complications, reoperations, hospital stay or pelvic sepsis rates except the anastomotic stricture rate in the colonic J-Pouch group after coloanal anastomosis (p < 0.02). CONCLUSIONS: These data show that either a colonic J-pouch or a straight anastomosis performed on the descending colon in low-anterior resection with TME are methods that can be used with similar expected surgical and functional results.


Assuntos
Colo/cirurgia , Bolsas Cólicas , Neoplasias Retais/cirurgia , Reto/cirurgia , Canal Anal/cirurgia , Anastomose Cirúrgica , Humanos , Complicações Pós-Operatórias
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