Health Research, Inc.

Other

Christina Kitchen

Sean Philpott

Harold Burger

Barbara Weiser

Scott G Kitchen

A change in viral tropism occurs in many HIV positive individuals over time and may be indicated by a shift in coreceptor use from CCR5 to CXCR4. The shift in coreceptor use to CXCR4 has been shown to correlate with increased disease progression. In patients undergoing HAART, the predominant populations of virus may be shifted back to CCR5-mediated entry soon after the CXCR4-specific strains have emerged. The present invention relates to a diagnostic method to monitor coreceptor use in the treatment and clinical management of human immunodeficiency virus (HIV) infection. The present invention further relates to a diagnostic method applied to HIV-positive individuals undergoing HAART to monitor the suppression of CCR5- or CXCR4-specific strains. The diagnostic methods may be used to assist in selecting antiretroviral therapy and to improve predictions of disease prognosis over time. The methods of the invention include cell-based methods, including cell fusion assays, and molecular-based methods, including heteroduplex tracking assay, to both quantitatively and qualitatively analyze patient-derived HIV for coreceptor usage.

Heteroduplex tracking assay

A change in viral tropism occurs in many HIV positive individuals over time and can be indicated by a change in coreceptor usage from CCR5 to CXCR4. The change in coreceptor usage to CXCR4 has been shown to correlate with increased disease progression. In patients undergoing HAART, the predominant populations of virus can be shifted back to CCR5-mediated entry after the CXCR4-specific strains have emerged. The present invention relates to a diagnostic method to monitor coreceptor use in the treatment of human immunodeficiency virus (HIV) infection. The present invention further relates to a diagnostic method applied to HIV-positive individuals undergoing HAART to monitor the suppression of CXCR4 specific strains. The diagnostic methods can be used to assist in selecting antiretroviral therapy and to improve predictions of disease prognosis over time.

Analysis of HIV-1 coreceptor use in the clinical care of HIV-1-infected patients

A method and system for deriving an outcome predictor for a data set in which a number of complex variables affect outcome. A two step model is applied that includes application of 1) a flexible nonparametric tool for modeling complex data, and 2) a recursive partitioning (e.g., classification and regression trees) methodology. In one variation, a determination is made as to whether the data set used is representative of a population of interest; if not, underrepresented data is replicated so as to produce a representative data set. In one variation, a holdout sample of the data is also used with the two step model and the determined outcome predictor to verify the predictor produced.

Method and system for determining phenotype from genotype

A change in viral tropism occurs in many HIV positive individuals over time and can be indicated by a shift in coreceptor use from CCR5 to CXCR4. The shift in coreceptor use to CXCR4 has been shown to correlate with increased disease progression. In patients undergoing HAART, the predominant populations of virus can be shifted back to CCR5-mediated entry after the CXCR4-specific strains have emerged. The present invention relates to a diagnostic method to monitor coreceptor use in the treatment of human immunodeficiency virus (HIV) infection. The present invention further relates to a diagnostic method applied to HIV-positive individuals undergoing HAART to monitor the suppression of CXCR4 specific strains. The diagnostic methods can be used to assist in selecting antiretroviral therapy and to improve predictions of disease prognosis over time.

Growing community of inventors

Los Angeles, CA, United States of America

Christina Kitchen