Silk-Based Blood Sample Stabilization for Prostate Cancer Diagnostics

DESCRIPTION provided by applicant There is a critical need for a blood sample preparation and processing method that can preserve integrity and improve downstream analysis while being completely free of cold storage requirements Such a technology would allow clinicians and patients to collect blood samples for cancer screening monitoring and or diagnosis comfortably from patientandapos s homes obviating the need for outpatient lab visits Vaxess Technologies is developing a set of biomaterial based approaches that improves the stability of a wide range of samples using a novel silk protein matrix The objective of this proposal is to characterize the ability of a silk matrix to stabilize a panel of metabolomic prostate cancer biomarkers in a blood sample The enhanced performance of silk based protection will be compared to other similar methods dried blood spot DBS cards and the gold standard frozen storage We anticipate that the use of silk will allow for minimally or non invasive sample collection routes and will provide comparable analyte retention to the current gold standard frozen storage while improving recovery as compared to commercially available DBS cards Vaxess has extensive preliminary data demonstrating the use of silk to stabilize antibodies plasma proteins and nucleic acids from complex fluids such as whole blood plasma serum and saliva We anticipate being able to do the same with blood analytes as proposed here In the first aim we will form serum laden silk matrices and quantitate metabolomic prostate cancer marker levels This will be accomplished by using mass spectrometry to measure analyte recovery from silk matrices and comparing the yields directly to frozen controls or DBS cards Modifications of silk molecular weight and its net charge can systematically change proteomic interactions and thus provides a route to study the mechanistic underpinnings of silk stabilization in the context of sample recovery In a second aim we will compare the stability of markers identified in Aim to frozen control samples and DBS cards when all have been treated at various temperatures and humidity levels The expected outcome of these studies will be the development of a silk based sample preparation method for cancer specific analytes that will improve downstream sample processing The rationale for the proposed research is that once recovery and stability of these biomarkers is proven to be augmented by a silk encapsulate diagnostic kits can be outfitted with various silk formats which can then be used as a platform system for full validation in follow on studies Success with the planned approach can positively impact many areas of need in the field of cancer diagnostics including early detection screening and clinical diagnosis by increasing overall access to precise analytics and by reducing pre analytical variations that affect sample quality Furthermore by offering methods to interface with finger prick volumes of whole blood a silk based stabilization system could be used without a phlebotomist and thus circumvent the resource requirements of the outpatient clinic PUBLIC HEALTH RELEVANCE The proposed research will demonstrate the ability of silk to stabilize blood samples and improve methods of sample processing for cancer diagnostics and screening This project is relevant to public health because it will enable innovative approaches for sample collection and transport to laboratory facilities removing the need for cold storage improving testing accuracy and obviating the need for patient travel With more widespread adoption the entire healthcare system will see reduced costs and improved access to preventative cancer screening which should enable earlier stage treatment interventions