Antônio Sérgio Petrilli

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Osteosarcomas (OS) are aggressive tumors of the bone and often have a poor prognosis. Conventional cytogenetic analyses of OS have revealed highly complex karyotypes, with numerous abnormalities. In this study, we analyzed 18 untreated OS tumors from 17 patients of the younger incidence age group by comparative genomic hybridization (CGH), 4 tumors by(More)
BACKGROUND Infections are one of the major complications in children undergoing chemotherapy. Monotherapy with either ciprofloxacin or ceftriaxone is safe and efficient in low-risk patients (solid tumors and stage I/II lymphomas). The same drugs may be used in an outpatient setting, decreasing costs and the risk of nosocomial infections. PROCEDURE(More)
BACKGROUND The neurokinin-1 receptor antagonist aprepitant, plus a 5HT3 antagonist and corticosteroid is well-tolerated and effective in preventing chemotherapy-induced nausea and vomiting in adults but has not been formally assessed in adolescents. PROCEDURE Patients age 11-19 years old receiving emetogenic chemotherapy were randomized 2:1 to aprepitant(More)
Antibiotic monotherapy is increasingly an option for the initial empiric treatment of febrile neutropenic cancer patients. We noted in a previous study that response to empiric therapy was related more to disease classification (solid tumors vs. leukemia) than to the regimen chosen. In the present study we based empiric monotherapy on the underlying disease(More)
OBJECTIVE A pilot clinical study was conducted to evaluate the efficacy and feasibility of low-level laser therapy (LLLT) in the prevention and treatment of chemotherapy (CT)-induced oral mucositis (OM) in young patients. BACKGROUND DATA Besides compromising the patient's nutrition and well-being, oral mucositis represents a portal of entry into the body(More)
Preoperative intraarterial (IA) cisplatin (CDP) was administered to 92 patients with nonmetastatic osteosarcoma. The ages of the patients ranged from 4 to 28 years. Sixty-four patients (70%) received 2 or 3 preoperative courses and 28 (30%) received 4 or more. Sixty-two specimens were available for pathologic examination to assess the degree of tumor(More)
Osteosarcoma is the most common primary bone malignancy of adolescents and young adults. In order to better understand the genetic etiology of osteosarcoma, we performed a multi-stage genome-wide association study (GWAS) consisting of 941 cases and 3,291 cancer-free adult controls of European ancestry. Two loci achieved genome-wide significance: rs1906953(More)
We aimed to evaluate the prognostic significance of traditional clinical predictors in osteosarcoma through an international collaboration of 10 teams of investigators (2680 patients) who participated. In multivariate models the mortality risk increased with older age, presence of metastatic disease at diagnosis, development of local recurrence when the(More)
Osteosarcoma is a very aggressive tumor with a propensity to metastasize and invade surrounding tissue. Identification of the molecular determinants of invasion and metastatic potential may guide the development of a rational strategy for devising specific therapies that target the pathways leading to osteosarcoma. In this study, we used pathway-focused low(More)
BACKGROUND Usual treatment regimens with vancomycin often fail to provide adequate serum levels in patients with severe infections. METHODS Retrospective analysis of vancomycin trough serum measurements. The following parameters were calculated by Bayesian analysis: vancomycin clearance, distribution volume, and peak estimated concentrations. The area(More)