Lawrence F Paszat

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BACKGROUND Colonoscopy is advocated for screening and prevention of colorectal cancer (CRC), but randomized trials supporting the benefit of this practice are not available. OBJECTIVE To evaluate the association between colonoscopy and CRC deaths. DESIGN Population-based, case-control study. SETTING Ontario, Canada. PATIENTS Persons age 52 to 90(More)
PURPOSE An Institute of Medicine report recommends that patients with cancer receive a survivorship care plan (SCP). The trial objective was to determine if an SCP for breast cancer survivors improves patient-reported outcomes. PATIENTS AND METHODS Women with early-stage breast cancer who completed primary treatment at least 3 months previously were(More)
PURPOSE Use of androgen deprivation therapy (ADT) may be associated with an increased risk of diabetes mellitus but the risk of both acute myocardial infarction (AMI) and cardiovascular mortality remain controversial because few outcomes and conflicting findings have been reported. We sought to clarify whether ADT is associated with these outcomes in a(More)
PURPOSE Dermatitis is a frequent adverse effect of adjuvant breast radiotherapy. It is more likely in full-breasted women and when the radiation is distributed nonhomogeneously in the breast. Breast intensity-modulated radiation therapy (IMRT) is a technique that ensures a more homogeneous dose distribution. PATIENTS AND METHODS A multicenter,(More)
OBJECTIVE To characterise whether some selective serotonin reuptake inhibitor (SSRI) antidepressants reduce tamoxifen's effectiveness by inhibiting its bioactivation by cytochrome P450 2D6 (CYP2D6). DESIGN Population based cohort study. PARTICIPANTS Women living in Ontario aged 66 years or older treated with tamoxifen for breast cancer between 1993 and(More)
BACKGROUND & AIMS The rate of new or missed colorectal cancer (CRC) after colonoscopy and their risk factors in usual practice are unknown. Our objective was to evaluate the rate and risk factors in a population-based study. METHODS We analyzed data from the Canadian Institute for Health Information, the Ontario Health Insurance Program, and Ontario(More)
BACKGROUND & AIMS Most quality indicators for colonoscopy measure processes; little is known about their relationship to patient outcomes. We investigated whether characteristics of endoscopists, determined from administrative data, are associated with development of postcolonoscopy colorectal cancer (PCCRC). METHODS We identified individuals diagnosed(More)
This study measures the proportion of cancer patients in Ontario, Canada, with intensive care unit (ICU) admissions, emergency room (ER) visits, or chemotherapy in the last two weeks of life. We used the Ontario Cancer Registry to identify a cohort of cancer patients who died in 2001. These cases were then linked to administrative sources of data to measure(More)
BACKGROUND & AIMS The most widely quoted complication rates for colonoscopy are from case series performed by expert endoscopists. Our objectives were to evaluate the rates of bleeding, perforation, and death associated with outpatient colonoscopy and their risk factors in a population-based study. METHODS We identified all individuals 50 to 75 years old(More)
BACKGROUND & AIMS Technical advances have led to stool DNA (sDNA) tests that might accurately detect neoplasms on both sides of the colorectum. We assessed colorectal neoplasm detection by a next-generation sDNA test and effects of covariates on test performance. METHODS We performed a blinded, multicenter, case-control study using archived stool samples(More)