RESUMEN
The purpose of this study was to evaluate the film formation ability and mechanical stress-strain properties of aqueous native corn starches, using free films and film coatings applied to tablets. Free films were prepared from high-amylose corn (Hylon VII), corn and waxy corn starches, using sorbitol and glycerol as plasticizers. The tablets and pellets were film-coated using an air-suspension coater, and characterized with respect to the film coating surface topography, cross-sectional structure and thickness (SEM), and dissolution in vitro. The amylose content of the starch film formers affected both the tensile strength and the elongation. The elongations were under 5% for even the plasticized starches, and in most cases, no plasticization effect was seen by either of the plasticizers. Dissolution of native corn starch film-coated tablets (weight gain 1%) did not differ from uncoated ones. A notable delay in dissolution of the drug was found by increasing Hylon VII film coating thickness, suggesting controlled-release characteristics.
Asunto(s)
Almidón/química , Agua , Amilosa/química , Amilosa/ultraestructura , Química Farmacéutica , Microscopía Electrónica de Rastreo , Solubilidad , Almidón/ultraestructura , Estrés Mecánico , Propiedades de Superficie , ComprimidosRESUMEN
It is demonstrated that scanning electrochemical microscopy can be used to investigate the kinetics of electron transfer reactions catalysed by metal nanoparticles supported on an insulating substrate.
RESUMEN
In acute myelogenous leukemia (AML) intensive postremission treatment is needed for an optimal result. However, it is not known how long the treatment should last and how many courses are necessary. The object of this prospective study was to compare four and eight intensive chemotherapy cycles in the treatment of adult de novo AML. In a multicenter study, 248 consecutive patients, aged from 16 to 65 years, were treated with intensive induction treatment. The patients in remission after two courses were randomized to receive either two (short arm) or six (long arm) additional intensive cycles of chemotherapy. The median follow-up time of the living patients is 68 months. Of the patients, 77% achieved complete remission, and 36% of all patients survived for 5 years. Seventy-three patients were randomized to the short arm and 66 to the long arm. There was no significant difference in the relapse-free survival (median 21 months vs 17 months) or overall survival (43 months vs 39 months) between the short and long arms, respectively. Treatment-related deaths occurred in 31 patients (13%), 11 of them in first remission. More than one-third of the patients survived for 5 years. It seems probable that the first few months after diagnosis are decisive for the prognosis if the chemotherapy is intensive, and further treatment cannot markedly influence the outcome.
Asunto(s)
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Leucemia Mieloide Aguda/tratamiento farmacológico , Aclarubicina/administración & dosificación , Adolescente , Adulto , Anciano , Amsacrina/administración & dosificación , Protocolos de Quimioterapia Combinada Antineoplásica/efectos adversos , Citarabina/administración & dosificación , Daunorrubicina/administración & dosificación , Supervivencia sin Enfermedad , Esquema de Medicación , Etopósido/administración & dosificación , Femenino , Humanos , Masculino , Persona de Mediana Edad , Prednisolona/administración & dosificación , Estudios Prospectivos , Inducción de Remisión , Vincristina/administración & dosificaciónRESUMEN
In our previous double-blind trial, we reported that clodronate reduced the incidence of bone lesions, fractures, pain and hypercalcaemia in multiple myeloma. Recently, it has been assumed that the antiresorptive effect of bisphosphonates on the osteoclasts is mediated through the osteoblasts. We therefore determined, in 244 patients of the same trial, serum assays of aminoterminal propeptide of type I procollagen (PINP) and type I collagen degradation product (ICTP). PINP is an early synthesis product of proliferating osteoblasts, in comparison to the alkaline phosphatase (AP) which is secreted by differentiated osteoblasts during the maturation phase of collagen. ICTP circulates in serum when old bone is resorbed. Our results indicate that after 25 months, the PINP levels decreased in the clodronate group (from 68.9 +/- 4.4 micrograms/l to 37.2 +/- 3.5 micrograms/l; P < 0.001) but not in the control group (from 61.5 +/- 3.2 micrograms/l to 69.3 +/- 7.5 micrograms/l; P < NS). The fall in the ICTP levels was markedly steeper in the patients receiving clodronate (from 8.38 +/- 0.80 micrograms/l to 4.58 +/- 0.32 micrograms/l; P < 0.01) than placebo (from 7.84 +/- 0.53 micrograms/l to 6.45 +/- 0.95 micrograms/l; P = NS). A significant difference between the study groups was seen at 4 months in the PINP, at 7 months in the ICTP and at 13 months in the AP levels, suggesting that clodronate affected through the proliferating osteoblasts, the osteoclasts, and through the osteoclasts, the differentiated osteoblasts. High baseline ICTP, PINP and AP levels indicated a poor prognosis. The decrease of the markers by clodronate was more marked in survivors than in non-survivors.
Asunto(s)
Analgésicos no Narcóticos/farmacología , Ácido Clodrónico/farmacología , Colágeno/metabolismo , Mieloma Múltiple/sangre , Osteoblastos/efectos de los fármacos , Osteoclastos/efectos de los fármacos , Anciano , Fosfatasa Alcalina/sangre , Biomarcadores de Tumor/sangre , Método Doble Ciego , Femenino , Humanos , Masculino , Persona de Mediana Edad , Mieloma Múltiple/tratamiento farmacológico , Pronóstico , Precursores de Proteínas/sangre , Tasa de SupervivenciaRESUMEN
Interleukin-6 (IL-6) is a major growth factor for the clonal malignant plasma cells in multiple myeloma (MM). The effect of IL-6 may be enhanced by soluble IL-6 receptor (sIL-6R). As there is a clinical need for improved stratification of MM patients at diagnosis, we have studied the role of sIL-6R as a prognostic marker in 207 newly diagnosed MM patients. Serum sIL-6R concentration was above the upper reference limit in 47% of the patients at diagnosis. The concentrations of sIL-6R and two other prognostic factors, IL-6 and beta-2 microglobulin (beta 2M), were all significantly higher in the patients who died within 3 years compared with those who survived. However, serum sIL-6R did not show linear correlation with IL-6 or beta 2M levels. In univariate logistic regression analysis sIL-6R was a significant predictor of 3-year mortality. Kaplan-Meier analysis showed that raised levels of sIL-6r were associated with shorter survival. When the patients were stratified into four groups according to their serum IL-6 and sIL-6R levels the patients with normal serum levels of both parameters had clear survival benefit. As beta 2M was the most powerful prognostic factor in the multivariate analysis, the patients were also stratified according to their serum beta 2M and sIL-6R levels. The patients with raised levels of both beta 2M and sIL-6R had shorter survival than the patients in the other three groups. Thus, measurement of these parameters at diagnosis would help to stratify MM patients.
Asunto(s)
Antígenos CD/metabolismo , Interleucina-6/sangre , Mieloma Múltiple/sangre , Receptores de Interleucina/metabolismo , Adulto , Anciano , Anciano de 80 o más Años , Biomarcadores/sangre , Femenino , Humanos , Masculino , Persona de Mediana Edad , Análisis Multivariante , Pronóstico , Receptores de Interleucina-6 , Microglobulina beta-2/análisisRESUMEN
Multiple myeloma is characterized by bone disease including osteoporosis, osteolytic lesions, pathological fractures and hypercalcaemia leading to pain, immobilization and decrease in the quality of life. Clodronate, a bisphosphonate, has been shown to be effective in the treatment of hypercalcaemia in patients with multiple myeloma. In addition, clodronate reduces the progression of osteolytic lesions and the amount of vertebral fractures and may also relieve pain in these patients. Recent studies suggest that oral clodronate should be considered in the adjunctive treatment of all patients with active multiple myeloma independently of the presence of bone lesions at diagnosis. Due to its safety and efficacy, clodronate seems to have gained an important role in the management of patients with multiple myeloma.
Asunto(s)
Antimetabolitos/uso terapéutico , Enfermedades Óseas/tratamiento farmacológico , Ácido Clodrónico/uso terapéutico , Mieloma Múltiple/tratamiento farmacológico , Enfermedades Óseas/complicaciones , Enfermedades Óseas/prevención & control , Ensayos Clínicos Controlados como Asunto , Humanos , Hipercalcemia/tratamiento farmacológico , Estudios Multicéntricos como Asunto , Mieloma Múltiple/complicaciones , Osteólisis/prevención & controlRESUMEN
High serum level of bioactive interleukin-6 (IL-6) is regarded as a predictor of poor prognosis in multiple myeloma (MM). On the other hand, the reported levels of immunoreactive IL-6 have been highly variable, and the prognostic value of immunoreactive IL-6 in MM is not clear. We have analyzed the prognostic significance of serum immunoreactive IL-6, as measured by a sensitive immunosorbent assay, in 210 patients with newly diagnosed MM subsequently treated with intermittent melphalan and prednisone. The serum levels of acute phase proteins C-reactive protein (CRP), alpha 1-antitrypsin (alpha 1AT), and acid alpha 1-glycoprotein (orosomucoid; OM) were evaluated as surrogates for IL-6. Serum IL-6, CRP, alpha 1AT, and OM levels were raised in 42%, 40%, 41%, and 24% of the patients, respectively. There was a significant correlation between the clinical stage of the patients and serum IL-6 (P = .006), alpha 1AT (P = .001), and OM (P = .004) levels at diagnosis. At 3 years, 52% of the patients were alive. Univariate logistic regression analysis showed that high levels of IL-6 (P = .002), CRP (P = .02), alpha 1AT (P < .001), OM (P = .007), beta 2-microglobulin (beta 2M; P < .001), and thymidine kinase (P < .05) were all associated with 3-year mortality. In multivariate regression analysis, beta 2M (P < .0001) and alpha 1AT (P = .01) had independent prognostic significance. The patients with high levels of both beta 2M and alpha 1AT or IL-6 were at very high risk of dying within 3 years from diagnosis (16% and 21% of the patients in these groups were alive, respectively). When the patients were stratified according to the clinical stage, the prognostic significance of serum IL-6 and alpha 1AT was especially evident in stage II patients. When the patients were divided into two groups according to normal or raised serum IL-6 levels, the patients with high IL-6 levels had more frequent osteolytic bone lesions (P = .03) and a more aggressive disease. We conclude that serum immunoreactive IL-6 is a significant prognostic marker in MM.
Asunto(s)
Proteínas de Fase Aguda/análisis , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Biomarcadores de Tumor/sangre , Ácido Clodrónico/uso terapéutico , Interleucina-6/sangre , Mieloma Múltiple/sangre , Mieloma Múltiple/tratamiento farmacológico , Adulto , Anciano , Anciano de 80 o más Años , Análisis de Varianza , Calcio/sangre , Ácido Clodrónico/administración & dosificación , Creatinina/sangre , Femenino , Hemoglobinas/metabolismo , Humanos , Masculino , Melfalán/administración & dosificación , Persona de Mediana Edad , Mieloma Múltiple/mortalidad , Mieloma Múltiple/patología , Valor Predictivo de las Pruebas , Prednisona/administración & dosificación , Pronóstico , Análisis de Regresión , Factores de Riesgo , Albúmina Sérica/análisis , Tasa de Supervivencia , Ácido Úrico/sangreRESUMEN
Osteolytic lesions and pathological fractures are the major problems in the clinical management of multiple myeloma. We previously reported the main results of a randomized, controlled multicentre trial in 350 Finnish patients with multiple myeloma. All patients received standard melphalan-prednisolone treatment and were randomized to receive either clodronate 2.4 g daily or a placebo for 24 months. The proportion of patients with progression of osteolytic bone lesions was twice as high in the placebo group as in the clodronate group (24.0% v 12.0%, P = 0.026). The purpose of the present study was to investigate factors associated with the progression of osteolytic lesions and to identify subgroups of patients who would benefit most from clodronate treatment. In univariate logistic regression analysis, including treatment (placebo, clodronate), sex, age, pain index, serum calcium and creatinine, myeloma stage, number of osteolytic lesions at baseline, and number of vertebral fractures at baseline as independent variables and the progression of osteolytic lesions as a dependent variable, only the treatment with a placebo was associated with the progression of osteolytic bone lesions. Separate analyses with respect to the progression of osteolytic bone lesions were carried out in the following subgroups: male v female, < or = 64 v > 64 years, stage I v stage II-III myeloma, no osteolytic lesions at baseline versus osteolytic lesions at baseline, no vertebral fractures at baseline versus vertebral fractures at baseline. and a 50% treatment response to cytotoxic drugs versus no treatment response to cytotoxic drugs. The treatment with clodronate delayed the progression of osteolytic lesions similarly in these subgroups, with the exception of a subgroup of patients who did not have a 50% treatment response to cytotoxic drugs. The treatment with clodronate did not significantly increase treatment costs. We conclude that the treatment effect of clodronate seems to be independent of sex and age of the patients, the stage of myeloma, and the severity of bone lesions at diagnosis, but not of treatment response to cytotoxic drugs.
Asunto(s)
Ácido Clodrónico/uso terapéutico , Mieloma Múltiple/complicaciones , Osteólisis/prevención & control , Síndromes Paraneoplásicos/prevención & control , Anciano , Huesos/patología , Análisis Costo-Beneficio , Progresión de la Enfermedad , Método Doble Ciego , Femenino , Costos de la Atención en Salud , Humanos , Masculino , Persona de Mediana Edad , Mieloma Múltiple/tratamiento farmacológico , Osteólisis/etiología , Osteólisis/patología , Factores de RiesgoRESUMEN
Gray platelet syndrome (GPS) is a rare bleeding disorder characterized by thrombocytopenia, agranular gray platelets in blood films, and almost total absence of platelet alpha-granules and their constituents. We describe here a rare case of GPS with myelofibrosis and splenomegaly indicating extramedullary hematopoiesis. Splenectomy was followed by normalization of platelet count but the bleeding diathesis continued. Based on a follow-up of more than 15 years, the slight myelofibrosis in our patient seems to be non-progressive. We also summarize the major clinical and laboratory features of previously published cases of GPS in order to obtain more comprehensive understanding of this rare disorder. From the clinical point of view, the bleeding tendency in this syndrome generally varies from mild to moderate, and no specific treatment is usually needed. Careful examination of peripheral blood films is necessary for the diagnosis of this rare syndrome.
Asunto(s)
Trastornos de las Plaquetas Sanguíneas/sangre , Hematopoyesis Extramedular/fisiología , Adulto , Femenino , Humanos , Mielofibrosis Primaria/complicaciones , Mielofibrosis Primaria/fisiopatología , Esplenomegalia/complicaciones , Esplenomegalia/fisiopatología , SíndromeRESUMEN
In order to study the efficacy of an oral induction and consolidation regimen in the treatment of acute myeloid leukemia (AML) in elderly patients assessed not to tolerate full-scale intensive chemotherapy, 51 patients over 65 years of age with newly diagnosed AML were randomized to receive two cycles of either totally oral ETI (25 patients) or conventional 5-day TAD (26 patients). The median age of the patients was 73 years, range 65-87 years. Thirty-eight patients had de novo AML and the remaining patients AML subsequent to myelodysplastic syndrome ((n = 11) or treatment related AML (n = 2)). ETI consisted of etoposide 80 mg/m2 and thioguanine 100 mg/m2 twice a day on days 1-5, and idarubicin 15 mg/m2 on days 1-3, all given orally. TAD consisted of oral thioguanine and i.v. cytarabine, both in the dose of 100 mg/m2 twice a day on days 1-5, and daunorubicin 60 mg/m2 on day 5. The maintenance treatment was daily oral mercaptopurine 70 mg/m2 and weekly oral methotrexate 12 mg/m2. In the ETI group complete remission (CR) was achieved in six patients after the first cycle and in nine more patients after the second cycle. The CR rate was 15/25 = 60%. The corresponding figures for the TAD group were four and two remissions, CR rate 6/26 = 23% (p = 0.007). The survival was significantly longer in the ETI arm (p = 0.042). The median survival was 9.9 months in the ETI group and 3.7 months in the TAD group. There were no significant differences in the side effects between the two arms. In conclusion, the totally oral ETI regimen resulted in a significantly higher remission rate and longer survival than the 5-day TAD regimen in elderly patients with AML, with no more toxicity.
Asunto(s)
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Leucemia Mieloide/tratamiento farmacológico , Enfermedad Aguda , Administración Oral , Anciano , Anciano de 80 o más Años , Protocolos de Quimioterapia Combinada Antineoplásica/administración & dosificación , Citarabina/administración & dosificación , Daunorrubicina/administración & dosificación , Esquema de Medicación , Etopósido/administración & dosificación , Etopósido/efectos adversos , Femenino , Humanos , Idarrubicina/administración & dosificación , Idarrubicina/efectos adversos , Inyecciones Intravenosas , Masculino , Inducción de Remisión , Tioguanina/administración & dosificación , Tioguanina/efectos adversosAsunto(s)
Síndrome de Bernard-Soulier , Trombocitemia Esencial/diagnóstico , Enfermedades de von Willebrand/diagnóstico , Síndrome de Bernard-Soulier/complicaciones , Síndrome de Bernard-Soulier/diagnóstico , Síndrome de Bernard-Soulier/fisiopatología , Síndrome de Bernard-Soulier/terapia , Diagnóstico Diferencial , Hemorragia/prevención & control , Humanos , Factores de Riesgo , Trombocitemia Esencial/complicaciones , Trombocitemia Esencial/fisiopatología , Trombocitemia Esencial/terapia , Enfermedades de von Willebrand/complicaciones , Enfermedades de von Willebrand/fisiopatología , Enfermedades de von Willebrand/terapiaRESUMEN
Cryofibrinogenaemia refers to the presence of cold-precipitable proteins in plasma but not in serum. It is usually associated with malignancy, thromboembolic diseases or various inflammatory processes; rarely it may be essential. The most common clinical presentations of cryofibrinogenaemia are cold-intolerance, purpura, skin necrosis and ulcers. We describe a middle-aged woman with essential cryofibrinogenaemia, leukocytoclastic vasculitis, and chronic purpura for over 25 years with several exacerbations. In patients with otherwise unexplained purpura or skin necrosis, determination of plasma cryofibrinogen should be considered.
Asunto(s)
Crioglobulinemia/complicaciones , Crioglobulinas/metabolismo , Fibrinógeno/metabolismo , Fibrinógenos Anormales , Púrpura/complicaciones , Vasculitis Leucocitoclástica Cutánea/complicaciones , Adulto , Enfermedad Crónica , Femenino , Humanos , Vasculitis Leucocitoclástica Cutánea/patologíaRESUMEN
A highly sensitive blot-assay was developed for glycosaminoglycans (GAGs) and proteoglycans (PGs) utilizing a precipitation reaction by a cationic dye Cuprolinic Blue. The precipitates were deposited into 1-2 mm2 spots on nitrocellulose membrane by using a 96-well filtration apparatus. The dried sheet was digitized by a flat bed scanner and the intensity of the dots was quantitated by an image analysis software. The working range for chondroitin sulfate was 10-300 ng. The response of various GAGs differed according to the number of anionic groups, both sulphate and carboxyl groups being able to bind the dye. The sensitivity of the assay was decreased by high concentrations of GuC, CsC and protein, but not by nonionic detergents, common buffers and 8 M urea. Contact exposure to autoradiography film enabled quantitation of 25-250 DPM, and 1-10 DPM, of 35SO4-radioactivity in precipitated PGs after overnight and 14 days' exposures, respectively.
Asunto(s)
Cartílago Articular/química , Indoles , Compuestos Organometálicos , Proteoglicanos/análisis , Animales , Autorradiografía , Cationes , Bovinos , Células Cultivadas , Precipitación Química , Colodión , Colorantes , Medios de Cultivo , Glicosaminoglicanos/análisis , Procesamiento de Imagen Asistido por Computador , Membranas Artificiales , Reproducibilidad de los ResultadosRESUMEN
Osteolytic lesions and pathological fractures are common in multiple myeloma. Because clodronate inhibits osteoclastic resorption, we did a randomised, controlled trial in 350 patients from 23 hospitals. All patients received standard melphalan-prednisolone, and were randomised to receive clodronate 2.4 g daily or placebo for 24 months. The proportion of patients with progression of osteolytic bone lesions was twice as high in the placebo group (n = 168 at baseline) than in the clodronate group (n = 168 at baseline) in an intention-to-treat analysis (24 vs 12%, p = 0.026). Progression of vertebral fractures was lower in the clodronate group, but the difference was not significant (30 vs 40%). Serum calcium and urinary calcium excretion decreased significantly in both groups, but the changes were greater in the clodronate group. The percentage of patients feeling no pain increased more in the clodronate group (from 24 to 54%, p < 0.001) than in the placebo group (from 29 to 44%, p < 0.01). Side-effects were similar in both groups. We conclude that clodronate is an effective and safe adjunct in the management of multiple myeloma. The drug delays osteolytic bone lesions, reduces the degree of hypercalcaemia and hypercalciuria, and decreases pain.
Asunto(s)
Ácido Clodrónico/uso terapéutico , Mieloma Múltiple/tratamiento farmacológico , Anciano , Anciano de 80 o más Años , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Enfermedades Óseas/prevención & control , Calcio/sangre , Calcio/orina , Método Doble Ciego , Femenino , Estudios de Seguimiento , Fracturas Espontáneas/prevención & control , Humanos , Hipercalcemia/prevención & control , Masculino , Persona de Mediana Edad , Mieloma Múltiple/complicaciones , Dolor/prevención & control , PlacebosRESUMEN
Flow cytometry (FCM) has gained wide use in the determination of clonality in B-cell lymphoproliferative diseases and many methodological variations exist. We have compared the suitability of a) dual fluorochrome (FITC/PE)-labelled monoclonal antibodies, b) single fluorochrome (FITC)-labelled monoclonal antibodies and c) F(ab')2 fragments of FITC-labelled polyclonal antibodies for flow cytometric determination of clonality using commercially available software and a short sample preparation protocol. The FCM method was validated by analysis of immunoglobulin heavy chain and light chain gene rearrangements. We recommend the use of FITC-labelled monoclonals to obtain three parameters, the kappa/lambda ratio, D and D/S(n) values (Kolmogorov-Smirnov statistics) instead of the commonly used kappa/lambda ratio and D values only. This allows the use of a rapid sample preparation protocol to blood and bone marrow aspirates without sacrificing sensitivity or specificity obtained by the usual FCM method.