Background: While single nucleotide polymorphisms (SNP) in genes involved in DNA repair or drug metabolism have been shown to influence survival of metastatic colon cancer patients treated with FOLFOX, data on adjuvant setting are scarce.Methods: This study evaluated the correlation between disease-free survival (DFS) of 210 unselected stage III colon cancer patients receiving FOLFOX chemotherapy, and ERCC1-118 (rs11615, c.354T>C), XRCC1-399 (rs25487, c.1196G>A) and GSTP1-105 (rs1695, c.313A>G) polymorphisms. SNP were determined on tumor DNA using a PCR-based RFLP technique.Results: In univariate analysis, a trend towards longer DFS was observed for ERCC1 (C/T + T/T) versus (C/C) (HR=2.29; p=0.06), and XRCC1 (A/A) versus (G/G + G/A) (HR=1.61; p=0.16), but not for GSTP1 genotypes; a statistically significant p value was obtained when combining ERCC1 and XRCC1 favorable genotypes (0 versus ≥ 1 favorable genotypes, HR=2.42; p=0.02). After adjustment on tumor stage, lymph node ratio and differentiation grade, multivariate analysis showed that combining ERCC1 and XRCC1 genotypes gave a p value slightly above the threshold for statistical significance (HR=2.03; p=0.06), which was lower than for tumor stage, lymph node ratio or differentiation grade.Conclusion: The association of ERCC1 and XRCC1 polymorphisms may influence the prognosis of stage III colon cancer patients treated with FOLFOX adjuvant chemotherapy. Yet, these findings need to be confirmed in independent prospective studies.
In this study, we show that water influences the activity and selectivity of a ceria-supported gold catalyst for the oxidative dehydrogenation and esterification of ethanol in a fixedbed flow reactor, resulting in the production of acetaldehyde and ethyl acetate, respectively. The rate of acetaldehyde formation was enhanced upon incorporation of water in the feed stream at low pressures; beyond this, the water had little effect on the kinetics of the primary oxidation reaction. However, water induced significant changes to ethyl acetate production, decreasing the reaction order in ethanol and slowing the reaction rate. Furthermore, a large kinetic isotope effect for esterification was observed upon incorporation of either D 2 O or d-ethanol in the system, suggesting that breaking an OH bond is associated with the rate-determining step for this reaction. Our observations are consistent with the esterification process occurring through secondary oxidation of acetaldehyde to acetate species on the ceria surface followed by the acid-catalyzed esterification of surface acetates with ethanol. These results highlight the importance of water in gold-catalyzed processes and show that water can direct reaction selectivity in addition to influencing activity (as many previous studies have shown for CO oxidation).
Objective: Fatalities due to coronavirus disease 2019 continue to increase, and information on the epidemiological and clinical characteristics of deceased patients who were hospitalized with COVID-19 is limited in the Arab region. The current study aimed to address this gap. Methods: Three hundred and four Saudi patients in Jazan Region, Saudi Arabia, who died after being hospitalized with COVID-19 between July 1, 2020, and December 31, 2020, were analyzed in this retrospective cohort study. Results: A greater proportion of male patients (59%), compared to female patients (41%), died due to COVID-19. Just over half (55%) of the deaths due to COVID-19 affected patients aged ≥65 years. More than two-thirds of the deceased COVID-19 patients had diabetes (70%) and hypertension (69%); other comorbidities were obesity (30%), heart disease (30%), and chronic kidney disease (14%). Dyspnea (91%), cough (80%), and fever (70%) were the most frequently reported clinical symptoms. Eighty-five per cent of COVID-19 deaths occurred in patients admitted to the intensive care unit (ICU), and 90% of the patients required mechanical ventilation. Typically, lymphopenia, and neutrophilia were observed on admission and 24 hours prior to death. Creatinine and serum ferritin levels and erythrocyte sedimentation rate and D-dimer plasma levels increased significantly following infection with COVID-19. Lung infiltrates and pulmonary opacity (83%) were the most common findings on chest X-ray. Respiratory failure (70%) and acute respiratory distress syndrome (52%) were the leading complications to death. Logistic and Cox regression revealed that a higher age, smoking, high creatinine and aspartate transaminase levels, and respiratory failure were significantly associated with the risk of mortality during the early stay in hospitals. Conclusion:The proportion of comorbidities was high in deceased patients who were hospitalized with COVID-19 in Jazan region, Saudi Arabia. A higher age, smoking, and respiratory failure were significant predictors of mortality during the early stay in hospitals.
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