César Beltrán

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OBJECTIVE To compare implant positioning in the distal femur between 2 cohorts of elderly patients treated for a hip fracture with a long 200- or 150-cm radius of curvature (ROC) cephalomedullary nail. We theorized that the 150-cm ROC nails would more closely approximate the femoral bow and result in fewer implant-related complications. DESIGN(More)
BACKGROUND The purpose of this study is to evaluate the tolerability of hypofractionated helical tomotherapy (HT) in the treatment of localized prostate cancer. MATERIALS AND METHODS We evaluated 48 patients with primary adenocarcinoma of the prostate (cT1-T3N0M0) who were treated with hypofractionated HT from August 2008 through July 2011.(More)
OBJECTIVE The purpose of this study was to examine the efficacy and toxicity of treating small arteriovenous malformations (AVMs) (≤3 cm in diameter) with a median marginal applied dose of 14 Gy. METHODS Two hundred and thirteen patients diagnosed with AVMs were treated between January 1991 and December 2005. Seventy-three percent of the patients had(More)
PURPOSE To investigate the outcomes and risk factors of patients treated with stereotactic ablative radiotherapy (SABR) delivered by image-guided helical tomotherapy (HT) for extracranial oligometastases. METHODS From August 2006 through July 2011, 42 consecutive patients (median age 69 years [range 16-87]) with oligometastases (≤3) received HT to all(More)
BACKGROUND Radiation therapy plays a central role in the management of many childhood malignancies and Helical Tomotherapy (HT) provides potential to decrease toxicity by limiting the radiation dose to normal structures. The aim of this article was to report preliminary results of our clinical experience with HT in pediatric malignancies. METHODS In this(More)
PURPOSE The incidence of brainstem metastasis (BSM) accounts for 1-3% of brain metastases (BM). They are often associated with multiple BM and produce significant neurological symptoms. We retrospectively analyse the results of treatment with stereotactic radiosurgery (SRS). METHODS AND MATERIAL We included the medical records of 28 patients aged(More)
BACKGROUND Using a fixed higher-dose schedule, the efficacy and toxicity of suramin plus hydrocortisone were assessed in patients with metastatic hormone-refractory prostate carcinoma (HRPC). METHODS Fifty consecutive patients with HRPC (including those in whom hormonotherapy was withdrawn) and an Eastern Cooperative Oncology Group performance status of(More)
AIMS To evaluate the survival rates, prognostic factors and adverse events in patients with pituitary adenomas following fractionated stereotactic-guided radiotherapy (FSRT). MATERIAL AND METHODS Fifty-six patients with pituitary adenomas were treated with FSRT; 23 patients (41.1%) had primary adenomas, 33 had recurrent disease; 24 (42.9%) with(More)
The Augmented Lagrangean Relaxation (ALR) method is one of the most powerful techniques to solve the Short-Term Hydrothermal Coordination (STHC) problem. A crucial step when using the ALR method is the updating of the multipliers. In this paper we present a new multiplier updating procedure: the Gradient with Radar Step (GRS) method. The method has been(More)
Multidisciplinary treatment in high-risk breast cancer improves survival and local control. The feasibility and patterns of failure after several induction and high-dose consolidation regimens of chemotherapy were evaluated in this study. Between November 1990 and January 1997, 65 patients with histologically proven breast cancer American Joint Committee on(More)