Publications by authors named "Luis Bravo"

Background: Measures to control COVID-19 transmission disrupted childhood cancer care. Data on the effects of the COVID-19 pandemic on childhood cancer mortality are lacking. This study describes the impact of the pandemic on childhood cancer early-mortality (≤ 24 months).

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Introduction: Image guided superficial radiation therapy (IGSRT) is a novel technology which combines traditional superficial radiation therapy (SRT) with high resolution dermal ultrasound (HRDUS) to treat non-melanoma skin cancers (NMSC). Since development, IGSRT use has expanded dramatically in outpatient clinics. We review the IGSRT literature and state-of-the-art operating principles in US dermatologic practices.

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Background: Gastric adenocarcinoma is the fourth leading cause of global cancer mortality and leading infection-associated cancer. Gastric cancer has significant geographic variability, with a high incidence in East Asia and mountainous regions of Latin America. In the United States, gastric cancer represents a marked disparity with incidence rates that are two to three times higher in Hispanics compared to non-Hispanic Whites.

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Background: Two-thirds of global cancers occur in low/middle income countries (LMIC). Northern Central America is the largest LMIC region in the Western Hemisphere and lack cancer registries to guide cancer control. We conducted a gastric cancer survival study in rural Western Honduras, characterized as having among the highest gastric cancer incidence rates in Latin America.

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Background: Gastric adenocarcinoma is the fourth leading cause of cancer-related mortality and leading infection-associated cancer. Gastric adenocarcinoma has striking geographic variability, with high incidence in East Asia and mountainous Latin America. Reliable cancer data and population-based cancer registries are lacking for the majority of low- and middle-income countries, including the Central American Four region (CA-4, Nicaragua, El Salvador, Honduras, and Guatemala).

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Article Synopsis
  • The study focuses on survival rates of children and adolescents with primary CNS tumors in Colombia, as there's a lack of data in Latin America on this critical health issue.
  • A total of 879 children and 110 adolescents were included in the study, finding a 5-year overall survival rate of 54%, with the highest survival rates for lower-grade tumors.
  • Factors affecting prognosis included tumor type, location, surgical resection, and the use of radiation therapy, highlighting the importance of treatment choice in survival outcomes.
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Purpose: To describe the epidemiology, incidence, mortality and survival of ocular cancer in Cali between 1962 and 2019.

Methods: Ecological population-based study analyzing data of incidence, mortality, and 5-years survival of malignant ocular tumors from the Populational Cancer Registry of Cali between 1962 and 2019.

Results: Between 1962 and 2019, 586 ocular tumors were found, 50.

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Background: Stomach cancer is among the most frequent, is a leading cause of mortality in low- and middle-income countries. Assessing its survival is important to guide evidence-based health policies.

Aims: To estimate stomach cancer survival in Colombia (2014-2019) with data from the National Cancer Information System (NCIS) and in Cali with data from the Cali Population Cancer Registry (RPCC) (1998-2017).

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Key Points: Kidney survival in C3 glomerulopathy is significantly higher in patients with a disease chronicity score <4 and proteinuria <3.5 g/d, regardless of baseline eGFR. A faster eGFR decline in C3 glomerulopathy is associated with higher probability of kidney failure.

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Background: Gastric adenocarcinoma (GA) has changed in recent decades. Cancer estimates are often calculated from population-based cancer registries, which lack valuable information to guide decision-making (clinical outcomes). We describe the trends in clinical practice for GA using a hospital-based cancer registry over a timespan of 15 years.

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Background: Population-based cancer survival is an indicator of the effectiveness of cancer services that reflects the survival of all cancer patients in the population, regardless of socioeconomic status and disease characteristics.

Aim: Provision of an up-to-date survival estimate of patients recorded within Cali Population Cancer Registry (RPCC) in 1998-2017. As a second objective, results will be compared with those reported by the CONCORD study for cancers prioritized by the current Ten-Year Cancer Control Plan of Colombia, 2012-2021.

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Background: The population-based Cancer Registry of Cali Colombia operates continuously since 1962, disseminating incidence information in the XI volumes of Cancer Incidence in Five Continents.

Aim: To describe the incidence and mortality rates for the period 2011-2020 and the changes in the trend of incidence rates (1962-2017) and mortality rates from cancer (1986-2020).

Methods: The Joinpoint model and the annual percentage change (APC) were used as summary measures of the changes in the trends of incidence rates (ASR-I) and mortality (ASR-M) standardized by age with the direct method.

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Article Synopsis
  • C3 glomerulopathy is a rare kidney disease that affects how the complement system works, making it hard to predict individual patient outcomes.
  • Researchers conducted a study involving 115 patients across 35 nephrology centers to develop a nomogram that forecasts long-term kidney survival using factors like estimated glomerular filtration rate (eGFR), proteinuria, and chronicity score from kidney biopsies.
  • The final nomogram showed high accuracy (C-index of 0.860) in predicting kidney failure risk at 1, 2, 5, and 10 years, demonstrating reliable calibration between predicted and actual outcomes.
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Unlabelled: Helicobacter pylori (H. pylori) infection involves multiple factors internal and external to the host. Among the internal factors, the immune response plays a fundamental role in the process of antigen presentation, lymphocytic response and cytokine-mediated regulatory response that are directly as sociated with disease progression and prognosis.

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In populations with similar prevalence of Helicobacter pylori infection, cancer risk can vary dramatically. Changes in composition or structure of bacterial communities in the stomach, either at the time of exposure or over the course of H. pylori infection, may contribute to gastric pathology.

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Introduction: The Epstein-Barr virus (EBV) is classified as a group 1 carcinogen. The main route of EBV transmission is oral, through saliva. The present study aimed to determine the frequency of EBV detection in the oral cavity in high school students in the city of Cali (Colombia).

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Purpose: Population-based cancer registries (PBCRs) are critical for national cancer control planning, yet few low- and middle-income countries (LMICs) have quality PBCRs. The Central America Four region represents the principal LMIC region in the Western hemisphere. We describe the establishment of a PBCR in rural Western Honduras with first estimates for the 2013-2017 period.

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Diagnostic pathology services for oncology health systems are essential; yet, surveys, observations, and hard data from across low- and middle-income countries have revealed that these services are almost always lacking adequate quality and often missing completely. The City Cancer Challenge Foundation (C/Can), the American Society for Clinical Pathology, and C/Can partner cities undertook intense analysis of their existing pathology services as part of a year-long assessment process including the specific formation of a pathology-focused team. Internal and external expert assessments identified sustainable solutions adapted to the local context and level of resources and created specific local implementation projects.

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Large amounts of floating litter accumulate in the subtropical gyres, and the shorelines of oceanic islands in the vicinity of these accumulation zones receive large amounts of litter. The dynamics of marine litter arrival were evaluated on a small pocket beach on Rapa Nui (Easter Island) between November 2016 and June 2017 over a total time period of 190 days. Plastics dominated the stranded litter, with the majority of the items showing indications to come from the high seas fisheries operating in the South Pacific.

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Introduction: Head and neck cancer (HNC) is the seventh most common type of cancer in the world. In Latin America, data on HCN are limited by the scarcity of population-based cancer registries.

Objective: To describe survival and changes in the time trends of incidence and mortality rates of HCN with data from the Cali Cancer Population Registry (Colombia) during 1962-2018.

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Introduction: The low frequency of cases and deaths from the SARS-CoV-2 COVID-19 virus in some countries of Africa has called our attention about the unusual behavior of this disease. The ivermectin is considered a drug of choice for various parasitic and viral diseases and shown to have in vitro effects against SARS-CoV-2.

Aims: Our study aimed to describe SARS-CoV2 infection and death rates in African countries that participated in an intensive Ivermectin mass campaign carried out to control onchocerciasis and compare them with those of countries that did not participate.

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Article Synopsis
  • This study investigates how changes in protein levels in urine (proteinuria) over time relate to kidney health in patients with complement component 3 (C3) glomerulopathy.
  • Conducted across 35 nephrology departments in Spain, the research analyzed patient data from 1995 to 2020, focusing on the link between proteinuria trends and kidney failure risk.
  • Findings reveal that higher proteinuria levels significantly increase the risk of kidney failure, while a reduction of 50% or more in proteinuria is associated with a decreased risk, highlighting proteinuria changes as useful indicators for predicting kidney outcomes.
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Article Synopsis
  • A study aimed to validate a previously proposed prognostic histologic index for C3 glomerulopathy (C3G) by analyzing kidney biopsy findings in a new patient cohort from Spain.
  • The research included 111 patients from various nephrology departments, with assessments focusing on demographic data, clinical parameters, and specific C3G scoring systems.
  • Results showed that 43% of patients developed kidney failure, with significant predictors identified, including eGFR, proteinuria, and specific histological features like tubular atrophy and interstitial fibrosis.
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Population-based cancer registries (PBCRs) are the only means to provide reliable incidence and survival data as a basis for policy-making and resource allocations within cancer care. Yet, less than 3% and 10% of the respective populations of Central America and South America are covered by high-quality cancer registries. The Global Initiative for Cancer Registry Development provides support to improve this situation via the International Agency for Research on Cancer Regional Hub for Latin America.

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