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Colorectal cancer (CRC) is largely diagnosed at old age, when comorbidities and frailty are common and might be important prognostic factors of CRC. We aimed to systematically review epidemiological evidence on the prognostic role of comorbidity and frailty in CRC patients.We systematically searched the PubMed and Web of Science databases up to August 08, 2017 for observational studies that used a...
Findings from experimental and observational studies have suggested beneficial effects of beta blocker (BB) use on cancer survival. Nevertheless, results have been inconclusive and there have been concerns that the observed associations might have resulted from immortal time bias (ITB). We conducted a systematic review and meta-analysis to summarize existing evidence, paying particular attention to...
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