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Drug effectiveness study

Immortal time bias in pharmacoepidemiological studies on cancer patient survival: empirical illustration for beta-blocker use in four cancers with different prognosis

Immortal time bias (ITB) is still seen frequently in medical literature. However, not much is known about this bias in the field of cancer (pharmaco-)epidemiology. In context of a hypothetical beneficial beta-blocker use among cancer patients, we amed to demonstrate the magnitude of ITB among 9876 prostate, colorectal, lung and pancreatic cancer patients diagnosed between 1998 and 2011, which were selected from a database linkage of the Netherlands Cancer Registry and the PHARMO Database Network

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1 September 2017

Statin Use After Diagnosis of Colon Cancer and Patient Survival

BACKGROUND & AIMS: Statin use has been associated with a reduced incidence of colorectal cancer and might also affect survival of patients diagnosed with colon cancer. Statins are believed to inhibit Ras signaling and may also activate the bone morhogenetic protein (BMP) signaling pathway in colorectal cancer cells

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1 August 2017

Pre- and post-diagnostic beta-blocker use and lung cancer survival: A population-based cohort study

Beta-blockers have been associated with decreased cancer mortality. However, evidence for lung cancer is sparse and reported beneficial effects might be based on biased analyses. In this so far largest study we investigated the association betweeneta-blocker use and lung cancer survival. Therefore, patients with a lung cancer diagnosis between April 1998 and December 2011 were selected from a database linkage of the Netherlands Cancer Registry and the PHARMO Database Network

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1 June 2017

Pre- and post-diagnostic beta-blocker use and prognosis after colorectal cancer: Results from a population-based study

Recent experimental and epidemiological studies have suggested that beta blocker use might be associated with better cancer prognosis, but results were inconclusive and only few studies have investigated the association specifically for colorectalancer (CRC) patients. We investigated this hypothesis using a linked dataset of the Eindhoven area of the Netherlands Cancer Registry and the PHARMO record linkage, including patients diagnosed with CRC between 1998 and 2011

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1 April 2017

No decreased risk of gastrointestinal cancers in users of metformin in The Netherlands; a time-varying analysis of metformin exposure

Previous studies on metformin use and gastrointestinal (GI) cancer risk have yielded inconclusive results on metformin’s chemoprotective effects. We aimed to evaluate GI cancer risk in users of metformin in The Netherlands using a time-varying apprach in a large population-based database. A cohort study was performed using the NCR-PHARMO database

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1 March 2017

Use of Lipid-Modifying Therapy and LDL-C Goal Attainment in a High-Cardiovascular-Risk Population in the Netherlands

PURPOSE: This study investigates lipid-modifying therapy (LMT) and LDL-C goal attainment in a real-world, high-cardiovascular-risk population in the Netherlands. METHODS: From the PHARMO Database Network, patients aged >/=18 years with an LDL-C meaurement in 2012 (index date) were selected and hierarchically classified into the following mutually exclusive high-cardiovascular-risk categories: familial hypercholesterolemia (FH), recent acute coronary syndrome (ACS), coronary heart disease, ischemicstroke, peripheral arterial disease, and diabetes mellitus

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1 March 2017

The difference in association between aspirin use and other thrombocyte aggregation inhibitors and survival in patients with colorectal cancer

BACKGROUND: Several studies have suggested that the association between aspirin and improved cancer survival is mediated through the mechanism of aspirin as thrombocyte aggregation inhibitors (TAI). The aim of this study was to provide epidemiologial evidence for this mechanism assessing the association between overall survival and the use of aspirin and non-aspirin TAI in patients with colorectal cancer

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1 March 2017

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