Publications by authors named "Frederico Leal"

Background: Previous studies hypothesized that androgen deprivation therapy (ADT) may reduce severe acute respiratory syndrome coronavirus 2 (SARS-COV2) infectivity. However, it is unknown whether there is an association between ADT and a higher survival in prostate cancer patients with COVID-19.

Methods: We performed a retrospective analysis of prostate cancer (PC) patients hospitalized to treat COVID-19 in Brazil's public health system.

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Background: Cancer patients present a distinct vulnerability to COVID-19. It is unclear if chemotherapy could accentuate the overall risk in these patients.

Methods: We performed a retrospective analysis linking COVID-19 data and oncological information systems to compare lethality in patients undergoing cytotoxic chemotherapy before COVID-19.

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Article Synopsis
  • Abnormalities in the intrinsic apoptosis pathway, specifically linked to single nucleotide variants (SNVs) in caspase genes, were found to affect the progression and proliferation of head and neck squamous cell carcinoma (HNSCC).
  • This study evaluated the impact of CASP9 c.-1339A>G and CASP3 c.-1191A>G SNVs on patient outcomes by analyzing DNA and RNA from 262 HNSCC patients using real-time PCR methods.
  • Results indicated that specific genotypes (CASP3 c.-1191AG/GG and CASP9 c.-1339GG) correlated with increased risk of disease progression and death, suggesting these genetic variants could serve as predictors for survival in
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To evaluate the use of photobiomodulation therapy (PBM-T) in patients undergoing chemotherapy and/or radiotherapy and affected by oral mucositis (OM). Few clinical studies have evaluated PBM-T, particularly in combination with photodynamic therapy (PDT), for the treatment of OM. Thirty-one patients were divided by convenience into two groups.

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Background: Taxanes are the only cytotoxic drugs that have demonstrated a survival benefit for patients with castration-resistant prostate cancer (CRPC), but there is some evidence that platinum compounds may also benefit such patients.

Methods: We performed a systematic search on electronic databases. We sought prospective clinical studies testing platinum compounds for CRPC.

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Introduction: Cytotoxic chemotherapy is the mainstay treatment for metastatic colorectal cancer (mCRC). Fluoropyrimidines, oxaliplatin, and irinotecan are the most active drugs; however, their optimal sequencing has not yet been established. Some evidence has shown that upfront treatment with 5-fluorouracil, oxaliplatin, and irinotecan (FOLFOXIRI regimen) can improve outcomes for patients with mCRC.

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Background: Cetuximab and panitumumab are monoclonal antibodies targeting the epidermal growth factor receptor. Both drugs are active against RAS wild type metastatic colorectal cancer after chemotherapy failure, with similar efficacy and toxicity profiles. However, their cost and limited survival benefits may compromise incorporation in the Brazilian public healthcare system, the Unified Heath System (Sistema Único de Saúde) (SUS).

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Objectives: To investigate current evidence on the optimal duration of adjuvant hormone deprivation for prostate cancer treated with radiation therapy with curative intent.

Materials And Methods: A systematic search was performed in electronic databases. Data from randomized trials comparing different durations of hormone blockade was collected for pooled analysis.

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Introduction: The role of neoadjuvant endocrine therapy for resectable breast cancer is not well established, despite encouraging results obtained in the metastatic and adjuvant settings. This systematic review aims to examine existing medical literature on neoadjuvant hormone therapy (HT).

Methods: Data from prospective, randomized trials was included if comparing neoadjuvant HT versus surgery alone without adjuvant treatment, or neoadjuvant HT versus chemotherapy (CT), or HT plus CT versus CT alone, or HT plus CT versus HT alone, or two distinct HT.

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Introduction: Thrombotic microangiopathy (TMA) has been reported as a complication of chemotherapy. Many antineoplastic agents have been linked to TMA, gemcitabine being one of the most frequently cited as related to this syndrome.

Methods: A retrospective search for chemotherapy-induced TMA cases among gemcitabine users in a single oncology centre from January 2009 to September 2012 was performed.

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Aim: To assess the degree of discomfort caused by length measurement in neonates, performed with one or both lower limbs extended, on the first and second day after birth, with either one or both lower limbs extended.

Methods: Healthy full-term neonates were systematically sampled during the months of February and March 2004. Crown-heel length was measured, using a 1-mm precision neonatometer, at approximately 8 h and 32 h after birth, with one and both lower limbs extended.

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