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Darren Davis, Senior Vice President at Precision for Medicine, explores the need for specialty labs in cancer treatment plans.
The promise of precision medicine is the delivery of the right treatment to the right patient at the right time. Increasingly, oncologists are formulating cancer treatment plans based on insights from complex laboratory and imaging tests that characterize an individual patient’s tumor at a molecular level. However, the makeup of tumors can be quite complex and heterogeneous, even within a single patient and the effective use of molecular characterizations in informing cancer care requires an integrated framework for collecting, analyzing and interpreting tumor data.
In May 2019, Precision for Medicine, a Precision Medicine Group company, announced that it is providing its state-of-the-art laboratory services to perform drug assessment as part of a new personalized medicine clinical trial designed to identify the most effective therapies for individual patients with lymphoma. This novel study, conducted at The University of Texas MD Anderson Cancer Center9, utilizes Precision for Medicine’s Houston-based CLIA-certified laboratory (formerly ApoCell, Inc.) to conduct real-time stratification on a specially selected group of patients with B-cell lymphoma who have failed standard of care. The objective is to screen up to 30 different drug combinations for each patient to determine the most effective treatment for that individual.
Tumor cells are collected from each patient and samples are isolated and tested for response to specific therapies, with results generated within 24-48 hours and communicated back to MD Anderson.
Figure 1. Real-time patient profiling workflow
Using the insights derived from Precision’s lab testing, the investigators will be able to align patients with the best treatment for their individual tumor. This work is groundbreaking in that it leverages specialized laboratory services to inform personalized medicine in an accelerated timeframe. However, it is critical to point out that a study of this scope and scale is only possible with the right laboratory services partner:
By individually screening up to 30 therapies for each patient, this approach has the potential to improve patient outcomes and truly deliver upon the promise of personalized medicine. If successful, this pilot study could be expanded to a larger population of patients, scaling its impact.
Partnerships such as the one forged between The University of Texas MD Anderson Cancer Center and Precision for Medicine may become more common as the field of precision medicine matures. As technology has evolved, the volume, variety and velocity of information has increased exponentially. To handle all of the data generated, we are also seeing advances in methods in improve data collection, storage, cleaning, processing and interpretation.1 Specialized laboratory services play a critical role in the quest to extract meaning from large datasets.
Below are some clinical trial trends that are driving the need for specialized laboratory capabilities:
Immune cell profiling
With the advent of targeted therapies and immuno-oncology treatments, immune cell profiling has become an indispensable part of the oncology drug development process. Insights gained from profiling of the immune system can be used to optimize therapeutic design and treatment strategies, as well as to monitor disease progression and treatment response. Advanced laboratory techniques such as flow cytometry and epigenetic-based immune monitoring can be used to quantify and type immune cell populations in a multi-dimensional, high-complexity fashion.
Tumor molecular profiling
We are seeing pilot studies of real-time targeted molecular profiling across oncology therapeutic areas. In a recent study of newly diagnosed glioblastoma, researchers presented a comprehensive approach for utilizing molecular diagnostics at the time of diagnosis to generate insights in a clinically meaningful timeframe. This study involved complex multilayer molecular diagnostics, including whole-exome sequencing, low-coverage whole-genome sequencing, RNA sequencing, as well as microarray-based gene expression profiling and DNA methylation arrays. The researchers found that these molecular diagnostics were feasible, with a median turnaround time of 4-5 weeks. In 35% of cases, potentially relevant therapeutic decisions were derived from the data generated. In addition, the testing identified clonal alterations in individual tumors which constitute promising targets for targeted therapies.2
As advances in analytical chemistry have enabled the precise, accurate measurement of analytes in bodily fluids and tissues, biomarkers have become integral to the practice of medicine. Biomarkers can now be used to address a myriad of questions about activity, safety, and efficacy throughout the drug discovery and development process. As targeted therapies and immuno-oncology therapies proliferate, biomarkers are increasingly relied upon for patient stratification and treatment selection.
Biomarkers can be broadly classified into three categories:
Figure 2. Potential uses of biomarkers
A 2018 report revealed that drugs developed using a biomarker-guided precision medicine are more likely to reach the market, especially in oncology.4 The use of biomarkers as inclusion or exclusion criteria for clinical trial enrollment may be a powerful predictor of commercial success. In a BIO industry analysis which examined clinical development success rates from 2006 to 2015, programs that utilized selection biomarkers had higher success rates at each phase of development. This analysis revealed that the use of selection biomarkers led to a threefold increase in the likelihood of progressing all the way through to approval (see Figure 3).5 In fact, in 2018, a record 25 precision medicines were approved, representing 42 percent all of new drug approvals.6
Figure 3. Selection biomarkers increase likelihood of success
The evaluation of biomarkers requires integration of specialty lab data, such as flow cytometry, gene expression profiling, and immunosequencing, with pharmacokinetics, safety, and clinical data. It may also require development of a custom assay. Utilizing a centralized specialty lab rather than local laboratories for biomarker assay analysis may be beneficial for limiting the risk of variability which can result in inter-laboratory differences in methods, instruments, validation standards and quality control processes.
Companion diagnostic development
Part of the broader category of in vitro diagnostics, companion diagnostics are predictive biomarker assays that provide information which is considered necessary for the safe and effective use of a corresponding therapeutic. As of August 2019, the U.S. Food and Drug Administration (FDA) has cleared or approved 37 companion diagnostic devices, including both in vitro diagnostics and imaging tools.7 Drug manufacturers who are interested in developing a companion diagnostic for their therapeutic are tasked with developing an assay that is both analytically and clinically valid. Analytical validity indicates that the assay measures the intended biomarker, while clinical validity means that the assay measures how well the biomarker relates to the presence, absence, or risk of a disease. The majority of FDA-approved companion diagnostics also have clinical utility, which ties use of the diagnostic to a net improvement in health outcomes or useful information about the diagnosis, treatment, management, or prevention of disease. Development of a companion diagnostic-especially when codeveloped with a drug-is complex, and specialty labs play a critical role.
Figure 4. Use of companion diagnostics in oncology and non-oncology clinical trials8
Circulating tumor cells
As tumors grow, cancer cells along the edges of the tumor may migrate into the bloodstream and circulate through both the blood and lymphatic system. These circulating tumor cells (CTCs) can continue in circulation, join with other CTCs, or become lodged in outlying tissues to form more tumors. Capturing CTCs from the blood or other bodily fluids is less invasive than performing surgical tumor biopsies, and CTCs can be used to detect clues about the underlying genetics of the cancer in the hope that this information leads to better diagnosis and treatment.
CTCs can be used for monitoring the pharmacodynamic effects investigational therapies. In order to do this, CTCs must be isolated from the blood and then enriched. This process requires specialized laboratory expertise to achieve high specificity with optimized recovery rates and purity, thus allowing for the most relevant enriched population of cells to be further characterized for proteomics, fluorescent in situ hybridization (FISH) / in situ hybridization (ISH), or transcriptomic analysis such as DNA microarrays, next-generation sequencing (NGS) and RNA sequencing. Transcription can even be investigated at the level of individual cells using single-cell transcriptomics.
Precision for Medicine has developed ApoStream, a proprietaryliquid biopsy technology to detect, isolate, and capture CTCs and other rare cells without the need for labels or antibodies. In addition, Precision for Medicine has been a pioneer in developing the technology for high-volume capture of CTCs to enable precision medicine in the clinical setting.
Patient samples are a limited resource and, with the multitude of tests that may be performed on a single sample, specialized laboratory expertise is needed to optimize the data extracted. For example, Precision for Medicine offers an integrated laboratory services platform that enables the generation of both phenotypic and genomic information from the same biopsy sample.
When looking for a specialty lab partner for your drug development program, here are some factors to consider:
Precision medicine relies on advances in clinical diagnostics which enable patient and tumor profiling that informs diagnosis, treatment, and monitoring. For example, advancements in NGS have made it possible to sequence an entire human genome in a single day, making it possible to identify specific cancer mutations and match patients to personalized therapies in a clinically meaningful timeframe. As we look to the future, we anticipate that an increasing number of studies will require processing of assays on a large scale and analysis of thousands of samples in a very short period of time. Specialty laboratories are critical for meeting this need and delivering on the promise of precision medicine.
Darren Davis, PhD, is the Senior Vice President at Precision for Medicine.
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