Treatment of stage I, IIA, IIIA1 pediatric Hodgkin disease with doxorubicin, bleomycin, vincristine and etoposide (DBVE) and radiation: a Pediatric Oncology Group (POG) study.

PURPOSE: The objectives of this study were to evaluate the feasibility of reducing therapy, while maintaining treatment efficacy, in the context of a cooperative group clinical trial that allowed for clinical staging in early stage Hodgkin disease (HD). PATIENTS AND METHODS: Between August 1992 and December 1993, 51 eligible children < or =21 years of age, 31 male and 20 female, were enrolled in this study which was designed for low stage (IA, IIA, IIIA1) HD. Laparotomy and surgical staging was optional. Five postpubertal patients with Stage IA and IIA disease received only involved-field radiation therapy. The other 46 patients, who form the basis of this report, received combined modality therapy consisting of four courses of doxorubicin, bleomycin, vincristine, and etoposide (DBVE) followed by 2,550 cGy involved-field irradiation. RESULTS: With a median follow-up of 8.4 years, the 6-year overall and event-free survival rates for the 46 patients treated with combination therapy were 98 +/- 2% and 91 +/- 5%, respectively. All patients achieved remission after completion of therapy. There have been four recurrences and a remission death due to gunshot wound. Combined modality therapy was well tolerated. Predominant side effects were gastrointestinal and hemopoietic. There have been no clinically significant cardio-pulmonary side effects so far. CONCLUSION: In clinically staged children with early-stage HD, DBVE and low-dose involved-field irradiation was effective therapy with tolerable side effects and reduced potential for long-term adverse events.

Successful use of ReFacto continuous infusion in two paediatric patients with severe haemophilia A undergoing orthopaedic surgery.

In this report we describe the successful use of B-domain-deleted recombinant factor VIII (ReFacto) administered by continuous infusion during orthopaedic procedures in two children with severe haemophilia A. Both patients underwent ankle synovectomy and in patient 2, a medial patello-femoral ligament repair was performed in the same operative session. Patient 2 developed septic arthritis A in his knee joint and arthroscopic joint irrigation and debridement was performed 2 weeks after the initial procedure. Surgical cover was initiated with a bolus dose of ReFacto 50 IU kg(-1) followed by continuous infusion at 3.3-4.8 IU kg(-1) h(-1) which was maintained for up to 9 days postoperatively. Patient 2 received an additional bolus dose of 15 IU kg(-1) during the infusion period. All procedures were performed without haemostatic complications and long-term orthopaedic outcomes were good in both patients.

Designing and executing scientific workflows with a programmable integrator.

MOTIVATION: As in many other fields of science, computational methods in molecular biology need to intersperse information access and algorithm execution in a computational workflow. Users often find difficulties when transferring data between data sources and applications. In most cases there is no standard solution for workflow design and execution and tailored scripting mechanisms are implemented in a case by case basis. RESULTS: In this paper, we present a general purpose 'programmable integrator' that can access information from a variety of sources in a coordinated manner. Its usefulness in complex bioinformatics applications is claimed and supported by some application examples. AVAILABILITY: Tools are freely available to non-profit educations and research institutions. Usage by commercial organizations requires a license agreement. Software requirements: Java v1.3 (http://java.sun.com), Xerces XML Parser (http://xml.apache.org/xerces-j) and Kweelt implementation of XQuery (http://kweelt.sourceforge.net/).

Clinical presentation of rhabdoid tumors of the kidney.

PURPOSE: We designed this study to differentiate the clinical presentation, particularly the incidence of hematuria, of a rhabdoid tumor of the kidney (RTK), a rare but highly malignant tumor, from a Wilms tumor. PATIENTS AND METHODS: We reviewed patient flow charts from the National Wilms Tumor Study Group and queried participating hospitals to obtain additional information regarding presenting symptoms and laboratory data for fifty patients. Patient ages ranged from 2 days to 3.5 years with a mean of 11 months. We documented the presence of gross and microscopic hematuria, fever, and hypercalcemia. RESULTS: Whereas 75% of children with rhabdoid tumor of the kidney (RTK) had stage III (44%), IV (27%), or V (4%) tumors, 67% of children with Wilms tumors had stage I (41%) or II (26%) tumors. Either gross or microscopic hematuria was present in 84.4% (27/32) of the patients with RTK. Gross hematuria was present in 59% (22/37) of children with RTK compared with 18% previously reported with Wilms tumor. Microscopic hematuria was present in 76% (22/29) of children with RTK compared with 24% previously reported with Wilms tumor. Fever was found in 44% (16/36) of children with RTK, compared with 22% of children previously reported with Wilms tumor. Hypercalcemia was seen 26% (6/23) of children with RTK. CONCLUSION: Although diagnosis of any renal mass still must be confirmed with histopathologic features, a distinct clinical presentation with fever, hematuria, a young age, and high-tumor stage at presentation suggests the diagnosis of RTK.

Design and realization of an on-line database for multidimensional microscopic images of biological specimens.

The BioImage database is a new scientific database for multidimensional microscopic images of biological specimens, which is available through the World Wide Web (WWW). The development of this database has followed an iterative approach, in which requirements and functionality have been revised and extended. The complexity and innovative use of the data meant that technical and biological expertise has been crucial in the initial design of the data model. A controlled vocabulary was introduced to ensure data consistency. Pointers are used to reference information stored in other databases. The data model was built using InfoModeler as a database design tool. The database management system is the Informix Dynamic Server with Universal Data Option. This object-relational system allows the handling of complex data using features such as collection types, inheritance, and user-defined data types. Informix datablades are used to provide additional functionality: the Web Integration Option enables WWW access to the database; the Video Foundation Blade provides functionality for video handling.

A framework for querying a database for structural information on 3D images of macromolecules: A web-based query-by-content prototype on the BioImage macromolecular server.

Nowadays we are experiencing a remarkable growth in the number of databases that have become accessible over the Web. However, in a certain number of cases, for example, in the case of BioImage, this information is not of a textual nature, thus posing new challenges in the design of tools to handle these data. In this work, we concentrate on the development of new mechanisms aimed at "querying" these databases of complex data sets by their intrinsic content, rather than by their textual annotations only. We concentrate our efforts on a subset of BioImage containing 3D images (volumes) of biological macromolecules, implementing a first prototype of a "query-by-content" system. In the context of databases of complex data types the term query-by-content makes reference to those data modeling techniques in which user-defined functions aim at "understanding" (to some extent) the informational content of the data sets. In these systems the matching criteria introduced by the user are related to intrinsic features concerning the 3D images themselves, hence, complementing traditional queries by textual key words only. Efficient computational algorithms are required in order to "extract" structural information of the 3D images prior to storing them in the database. Also, easy-to-use interfaces should be implemented in order to obtain feedback from the expert. Our query-by-content prototype is used to construct a concrete query, making use of basic structural features, which are then evaluated over a set of three-dimensional images of biological macromolecules. This experimental implementation can be accessed via the Web at the BioImage server in Madrid, at http://www.bioimage.org/qbc/index.html.

Organising multi-dimensional biological image information: the BioImage Database.

Nowadays it is possible to unravel complex information at all levels of cellular organization by obtaining multi-dimensional image information. At the macromolecular level, three-dimensional (3D) electron microscopy, together with other techniques, is able to reach resolutions at the nanometer or subnanometer level. The information is delivered in the form of 3D volumes containing samples of a given function, for example, the electron density distribution within a given macromolecule. The same situation happens at the cellular level with the new forms of light microscopy, particularly confocal microscopy, all of which produce biological 3D volume information. Furthermore, it is possible to record sequences of images over time (videos), as well as sequences of volumes, bringing key information on the dynamics of living biological systems. It is in this context that work on BioImage started two years ago, and that its first version is now presented here. In essence, BioImage is a database specifically designed to contain multi-dimensional images, perform queries and interactively work with the resulting multi-dimensional information on the World Wide Web, as well as accomplish the required cross-database links. Two sister home pages of BioImage can be accessed at http://www. bioimage.org and http://www-embl.bioimage.org

Long-term neurologic outcome in children with opsoclonus-myoclonus associated with neuroblastoma: a report from the Pediatric Oncology Group.

A retrospective data collection was performed on 29 children diagnosed with neuroblastoma and opsoclonus-myoclonus between 1983-1993 from Pediatric Oncology Group institutions. The aim was to describe neurologic outcome in children with neuroblastoma and opsoclonus-myoclonus. Age at diagnosis ranged from one month to 4 years (median age, 18 months). The duration of opsoclonus-myoclonus symptoms prior to the diagnosis of neuroblastoma ranged from 6 days to 17 months (median duration, 6 weeks). There was a prevalence of low stage disease according to the POG staging system: stage A (n = 18), stage B (n = 3), stage C (n = 7), stage D (n = 1). There was a predominance of paraspinal primary tumors. There was no case of Nmyc amplification (0/17), and 2/8 cases were diploid. Treatment for neuroblastoma consisted of surgery alone in 19/29 (18 stage A, 1 stage C in thorax), and surgery plus chemotherapy in 10/ 29. No patient received radiotherapy. Treatment for opsoclonus-myoclonus ranged varied. Six children received no treatment for opsoclonus-myoclonus. The following agents were used ACTH (n = 14), prednisone (n = 12), IV IgG (n = 6), immuran (n = 2), depakote (n = 1), and inderal (n = 1). Eighteen of 29 children (62%) had resolution of opsoclonus-myoclonus symptoms. The range of time for recovery was a few days to 3 years. However the majority recovered over several months. Twenty of 29 children (69%) had persistent neurologic deficits including speech delay, cognitive deficits, motor delay, and behavioral problems. Of the 9 children who had complete recovery of opsoclonus-myoclonus without neurologic sequelae, age at diagnosis and duration of symptoms were not different from the entire group. Interestingly, 6/9 children with complete recovery received chemotherapy as part of their treatment. In conclusion, persistent neurologic deficits are characteristic for children with neuroblastoma and opsoclonus-myoclonus. Treatment with chemotherapy may improve the neurologic outcome.

Effect of chronic erythropoietin administration on plasma iron in newborn lambs.

Erythropoietin, the primary stimulator of erythropoiesis, represents an important potential therapy for the anemia of prematurity. Enhancement of the therapeutic benefit of recombinant human erythropoietin (rhEp) in very-low-birth-weight infants will require a better understanding of rhEp's pharmacodynamic effects including its interaction with iron in stimulating erythropoiesis. The purpose of this study was to determine the effects of chronic rhEp administration on plasma iron levels and hematopoiesis using a twin lamb model. Nine pairs of twin lambs in which one twin was randomized to receive rhEp, and the other saline, were studied during a 1-week baseline and a subsequent 4- to 5-week treatment period. The effects of therapy on plasma iron levels and erythropoiesis were measured by integrating the areas under the concentration-time curves (AUC) of the study variables. During the rhEp treatment period, significantly greater negative daily AUCs were observed in the rhEp-treated lambs for plasma iron concentration (p = 0.0008), while significantly greater positive daily AUCs were observed for hemoglobin concentration (p = 0.04) and reticulocyte count (p = 0.02). In the rhEp-treated group, pretreatment iron concentrations were directly associated with the magnitude of the iron response during treatment such that the greater the pretreatment iron, the greater the daily AUC below the plasma iron concentration-time plot (r = -0.66, p = 0.05). For the placebo-treated group, this association tended toward, but did not achieve, statistical significance (r = -0.52, p = n.s.). These observations suggest that treatment of rapidly growing newborn lambs with rhEp results in increased iron utilization due to increased erythropoiesis and depends on iron status at the initiation of rhEp treatment. Use of the term neonatal lamb model offers advantages over studies in human infants for more detailed or invasive examinations of the interaction of iron and rhEp treatment.

Analysis of megakaryocyte ploidy in fetal bone marrow biopsies using a new adaptation of the feulgen technique to measure DNA content and estimate megakaryocyte ploidy from biopsy specimens.

Platelet counts in newborns are similar to those of adults and children. However, newborn infants admitted to intensive care nurseries have a high prevalence of thrombocytopenia. The mechanisms responsible for the increased susceptibility to thrombocytopenia are not known. In addition, some studies have documented functional abnormalities in newborn platelets. In an effort to understand differences between platelets in newborns and in adults, we examined megakaryocyte ploidy in bone marrow from fetuses and compared it with bone marrow from adults, using a modified Feulgen stain to measure DNA of individual megakaryocytes. Faced with small fixed tissue samples, we developed a technique for use on bone marrow biopsies to estimate megakaryocyte ploidy and compared the results obtained with this method to those obtained from bone marrow aspirates. This study demonstrated that the overall mean ploidy of fetal megakaryocytes is decreased compared with adults. Additionally, fetal megakaryocyte ploidy increases as megakaryocyte maturation increases, but not to the same extent that adult megakaryocyte ploidy increases with megakaryocyte maturation. Over the gestational period studied, there was no relationship between gestational age and mean ploidy. The small size, shift to a less mature population, and decreased ploidy of fetal megakaryocytes indicate that there are differences in the post mitotic phase of megakaryocyte development in the fetus. Such differences may be related to quantitative and qualitative platelet abnormalities in the newborn. Understanding the physiology and regulation of megakaryocytopoiesis in the fetus and newborn will be valuable in determining the pathophysiologic basis of platelet dysfunction in the newborn.

Neuroblastoma-associated opsoclonus-myoclonus treated with intravenously administered immune globulin G.

An 18-month-old black girl had progressive truncal ataxia, opsoclonus, and multifocal myoclonus associated with a nonresectable abdominal ganglioneuroblastoma. Before chemotherapy, she received intravenously administered IgG, 1 gm/kg, for 2 days; within 48 hours of the first dose, there was significant improvement of the opsoclonus-myoclonus and ataxia. She required a 1 gm/kg maintenance dose every 4 to 6 weeks for a total of 12 doses, but is now free of symptomatic after 2 years with no therapy.

Thrombocytopenia and absent radii syndrome: defective megakaryocytopoiesis-thrombocytopoiesis.

Thrombocytopenia and absent radii (TAR) syndrome is a congenital defect with osseous abnormalities and thrombocytopenia. It is inherited as an autosomal recessive trait, but the mechanism of thrombocytopenia in this disorder is not clear. We have had the opportunity to study the mechanism of thrombocytopenia in an infant with TAR syndrome. The infant had normal levels of thrombopoietin and megakaryocyte colony-stimulating activity in spite of marked thrombocytopenia. However, the megakaryocyte progenitor cells in the bone marrow produced abnormal colonies with increased numbers of megakaryocytes per colony and small megakaryocytes similar to the small megakaryocyte seen in vivo. These findings suggest that the TAR syndrome in this infant is due to a failure in the production of thrombopoietin or to an abnormal progenitor cell with a maturational defect.

Hb Iowa or alpha 2 beta 2(119)(GH2)Gly----Ala.

Hb Iowa with a Gly----Ala mutation at position beta 119(GH2) was observed in a Black infant and her mother. The baby was also heterozygous for Hb S; Hb Iowa was confused with Hb F at birth because its electrophoretic mobility was similar to that of Hb F1. The beta chain of Hb Iowa could be readily separated from the beta A, alpha, and gamma chains by polyacrylamide gel electrophoresis and by reversed phase high performance liquid chromatography. Structural characterization was through amino acid analyses of peptides isolated from a tryptic digest of the aminoethylated beta-Iowa chain. The Gly----Ala replacement in Hb Iowa does not affect its stability and oxygen carrying properties; hematological data for mother and child were within normal ranges.