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Biomedical subjects

T Kroll

Publications and source records attributed to T Kroll.

11 recordsLinked to original sources
PubMed2003

Understanding the consequences of access barriers to health care: experiences of adults with disabilities.

PURPOSE: The study explores: (1) the scope and nature of the consequences that adults with disabilities perceive as the result of inappropriate access to health care services; (2) the variability of these consequences by demographic attributes such as disability type, gender, and health insurance type; and (3) the inter-relatedness and multidimensionality of these consequences. METHODS: Qualitative, semi-structured, in-depth interviews were administered over the telephone to 30 participants with spinal cord injury, cerebral palsy, or multiple sclerosis as part of a nation-wide study on access and utilisation in the USA. Interviews were transcribed and coded for analysis using the qualitative analysis program, NVivo. RESULTS: Consequences were grouped into one of five categories: social, psychological, physical, economic and independence issues. Responses differed slightly with regard to disability type, gender and health insurance type. There was substantial overlap among consequence categories. For most respondents, negative consequences were not limited to just one area--frequently, one consequence triggered others. CONCLUSIONS: Health insurers and providers need a better understanding of the multiple consequences of access barriers. Based on this knowledge, detrimental and costly effects of inappropriate service delivery could be more effectively prevented. Implications for health care services and policy are discussed.

Adult↗
PubMed2002

Molecular characterization of breast cancer cell lines by expression profiling.

PURPOSE: Gene expression patterns provide detailed insights into cellular regulation that reflect minor differences of cellular capacity not accessible by standard descriptions of the cellular phenotype or origin. METHODS: To identify fundamental differences and similarities we analyzed the gene expression patterns of four breast cancer cell lines: MCF-7, SK-BR-3, T-47D, and BT-474. RESULTS: Although only a small subset of genes (597) is represented on the Atlas-cDNA-Array (Clontech) used, clear differences in the expression of a number of genes could be detected. For example, unique high levels of expressions were found for the HLH-protein ID-1 (MCF-7) and the receptor tyrosine kinase erbB2 (SK-BR-3 and T-47D). Most genes analyzed were expressed at comparable levels in all cell lines studied. CONCLUSIONS: For interpretation of the results sets of genes that show similar variation of expression among the cells were grouped together. Furthermore, our analysis allows the assignment of similarity values that lead to a relation profile of the cell lines. How these results correlate with known biological properties of the cell lines is discussed. Additionally, we demonstrate that results obtained by cDNA-Array hybridization for expression of the ErbB receptor family correlate well with competitive RT-PCR, thus confirming the reliability of the cDNA-Array analysis.

Breast Neoplasms↗
PubMed2001

Opposite association of two PPARG variants with cancer: overrepresentation of H449H in endometrial carcinoma cases and underrepresentation of P12A in renal cell carcinoma cases.

Peroxisome proliferator activated receptor gamma (PPARgamma) is a nuclear hormone receptor that has been shown to regulate differentiation and cell growth. Studies of the differentiative effects of PPARgamma agonists on several cancer cell lines led to the hypothesis that dysfunction of PPARgamma contributes to tumorigenesis. These functional observations were strengthened by genetic evidence: somatic loss-of-function mutations in PPARG, encoding PPARgamma, in sporadic colorectal carcinomas and somatic translocation of PAX8 and PPARG in follicular thyroid carcinoma. Recently overrepresentation of the H449H variant was found in a cohort of American patients with glioblastoma multiforme. The glioblastoma multiforme data suggest that PPARG contributes common, low-penetrance alleles for cancer susceptibility. To test this hypothesis in a broader range of cancers we examined a series of carcinomas of the cervix, endometrium, ovary, prostate, and kidney for germline sequence variation in PPARG. In addition to the two common sequence variants, P12A and H449H, there were five other sequence variants. P12A alleles were underrepresented in renal cell carcinoma patients compared to country-of-origin race-matched controls (3.75% vs. 12.1%, P<0.04). In contrast, the H449H variant was overrepresented in individuals with endometrial carcinoma compared to controls (14.4% vs. 6.25%, P<0.02). These observations lend genetic evidence consistent with our hypothesis that PPARG serves as a common, low-penetrance susceptibility gene for cancers of several types, especially those epidemiologically associated with obesity and fat intake.

Adenocarcinoma↗
PubMed2000

Effects of ligand activation of peroxisome proliferator-activated receptor gamma in human prostate cancer.

Peroxisome proliferator-activated receptor gamma (PPARgamma) is a nuclear hormone receptor that plays a key role in the differentiation of adipocytes. Activation of this receptor in liposarcomas and breast and colon cancer cells also induces cell growth inhibition and differentiation. In the present study, we show that PPARgamma is expressed in human prostate adenocarcinomas and cell lines derived from these tumors. Activation of this receptor with specific ligands exerts an inhibitory effect on the growth of prostate cancer cell lines. Further, we show that prostate cancer and cell lines do not have intragenic mutations in the PPARgamma gene, although 40% of the informative tumors have hemizygous deletions of this gene. Based on our preclinical data, we conducted a phase II clinical study in patients with advanced prostate cancer using troglitazone, a PPARgamma ligand used for the treatment of type 2 diabetes. Forty-one men with histologically confirmed prostate cancer and no symptomatic metastatic disease were treated orally with troglitazone. An unexpectedly high incidence of prolonged stabilization of prostate-specific antigen was seen in patients treated with troglitazone. In addition, one patient had a dramatic decrease in serum prostate-specific antigen to nearly undetectable levels. These data suggest that PPARgamma may serve as a biological modifier in human prostate cancer and its therapeutic potential in this disease should be further investigated.

Aged↗
PubMed2000

Conceptual analysis of compliance.

Compliance has been studied from a wide range of scientific perspectives including medicine, nursing, psychology and health economics. There is no agreement regarding a commonly accepted definition. Lack of consistency in the definition and measurement of compliance is a major problem in research which becomes more complicated in an international study. The response to the confusion over the term compliance has been to suggest and use alternative terms such as adherence, co-operation, mutuality and therapeutic alliance. These terms are ill-defined and often are used as synonyms. The purpose of this paper is to analyse definitions of the concept of compliance. Abstracts from MEDLINE have been analysed in order to identify the types of compliance research that have been carried out.

Cognition↗
PubMed2000

[Promoting social integration as the responsibility of rehabilitation in pediatric oncology].

Survival rates of most paediatric cancers are steadily improving as a result of improvements in diagnostics and treatment protocols. Long-term survival renders physical late effects and psychosocial adjustment problems ever more visible. The focus of this article is on school re-entry and social reintegration as core tasks of comprehensive rehabilitation efforts. So far only few systematic programmes exist in Germany to facilitate school re-entry and social integration of paediatric cancer survivors. The article outlines the prerequisites for such interventions and provides examples of re-entry programmes.

Adaptation, Psychological↗
PubMed1999

Treatment adherence in juvenile rheumatoid arthritis--a review.

Adherence to long-term complex treatment in children with Juvenile Rheumatoid Arthritis (JRA) is a major problem. This article reviews psychosocial factors that compromise treatment adherence and discusses ways to improve long-term adherence. Child-centred information, therapy management, behaviour modification, and parental monitoring are described as adherence facilitating strategies for clinical and non-clinical settings. Finally, the implications for further practice and research are discussed.

Adolescent↗
PubMed1995

[The Parent Questionnaire in Family-Oriented Rehabilitation/Oncology--an instrument for inpatient quality assurance].

Improved long-term survival rates in childhood cancer have resulted in an increased demand for family-centered care programs. The EFR-O was developed as a screening-instrument tapping parental stressors and resources. The instrument was designed in order to assist family health care providers in allocating parents to need-centered rehabilitation services.

Adaptation, Psychological↗