Increased possibilities during the last decades for early detection of prostate cancer have sparked research on preventable or treatable risk factors and on improvements in therapy. Treatments of the disease still entail significant side effects potentially affecting men during the rest of their lives. The studies of the present thesis concern different aspects of prostate cancer from etiological risk factors and factors influencing treatment to an improved methodology for the detection of treatment side effects. Papers I, II, both based in the population based cohort ULSAM (Uppsala Longitudinal Study of Adult Men), investigate possible risk factors of prostate cancer with options for intervention: selenium levels and the metabolic syndrome. The phenomenon of competing risk of death from other causes than prostate cancer and its impact on and importance for choice of statistical methods is also exemplified and discussed for the first time in prostate cancer research. -Smokers with low selenium status have an increased future risk of later development of prostate cancer. Influence of genetic variability appears plausible. -The metabolic syndrome and especially its increased waist circumference component are associated with later development of prostate cancer – taking competing risks of death from other causes into account. Papers III and IV using pharmacoepidemiological methods investigate aspects of drug utilisation in prostate cancer using nationwide and international databases. In Paper III factors influencing anti-androgen use in prostate cancer are investigated, both from a prescriber- and patient perspective.  The age and disease risk group of the patient, unsupported scientifically, influence both the prescribers’ choice of dose and the patients’ adherence to treatment. -Adherence, not previously investigated in male cancer patients, was considerably higher than reported for adjuvant breast cancer treatment. Subgroups of men suitable for intervention to increase adherence were identified. Paper IV, investigates the feasibility of improving an established method for screening large adverse drug reactions databases, the proportional reporting ratio (PRR), this by using restricted sub-databases according to treatment area (TA), introducing the concept of PRR-TA. -The PRR-TA method increases the signal-noise relationship of analyses; a finding highly relevant for possibly conserving manual resources in Pharmacovigilance work in a drug-authority setting.

This study identifies, tests and modifies factors for effective corporate online communication using a marketing public relations (MPR) perspective. An MPR perspective entails an integrated cross-disciplinary approach with a strong product and/or service focus. The need for the study is underscored by the fact that there is undoubtedly a lack of a theoretical framework in which to practise corporate online communication in the context of selling the organisation's products or services. In order to test the identified factors for effective corporate online communication, namely credibility, trust and long-term relationships, this study uses Q methodology as a research method and applies Q sorting as a means of data collection. Participants are asked to sort statements about corporate online communication in their preferred order of importance on a large board in the presence of the researcher. This is known as the Q sorting process. The identified factors are tested among 20 communicators and 20 receivers of corporate online communication. The participants' sortings of statements are compared by means of Q factor analysis and then analysed. The results of the study indicate that only one factor is perceived as an absolute significant factor for effective corporate online communication and that two of the factors necessitate modification. Consequently, based on the results, four factors are identified for effective corporate online communication, using an MPR perspective. These four factors are derived from the perspectives of both the communicators and receivers of corporate online communication and are included in a proposed theoretical framework of corporate online communication using an MPR perspective. / Communication / D. Litt et Phil.

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