Understanding Testing in Personalized Cancer Care
Cancer treatment decisions can feel overwhelming, especially when there are multiple treatment options, uncertain responses, and concerns about quality of life. Some patients explore functional drug response testing to better understand how their cancer cells react to different therapies in a laboratory setting.
In integrative and functional oncology settings, this category of testing is often explored to support more informed conversations with an oncology team, particularly when patients are also considering repurposed drugs or off-label therapies as part of a broader strategy.
At Internal Health and Wellness MD, we help coordinate functional drug response testing as a supportive service designed to help patients and physicians reduce guesswork and better understand potential response patterns in a personalized way.
Disclaimer: The testing described here is intended as a supportive educational tool only. It does not replace standard oncology care, diagnostic testing, imaging, or established treatment guidelines. Results do not guarantee outcomes and must be interpreted in collaboration with a licensed oncologist.
Repurposed Drug Assays in Integrative Oncology
One concept often discussed in integrative oncology is the idea of a repurposed drug assay, meaning laboratory testing that evaluates how cancer cells respond to medications that may have originally been developed for other uses but are being explored for cancer support strategies.
Different laboratories may use different names for this type of testing. For example, the testing coordinated through our clinic is performed by Datar Cancer Genetics, which refers to its platform as ChemoScale. While terminology may vary, the underlying idea is similar: evaluating how patient-derived cancer cells respond to different therapeutic agents in a controlled laboratory setting.
What Is Repurposed Drug Assay Testing?
Repurposed Drug Assay testing evaluates how live cancer cells derived from a patient respond to different therapeutic agents outside the body.
The testing coordinated through Internal Health and Wellness MD is performed through Datar Cancer Genetics, an international laboratory specializing in functional cancer cell analysis.
Cancer cells used for testing may come from:
- A fresh biopsy sample (when available)
- Blood-based circulating tumor-associated cells (C-TACs)
Unlike genetic or mutation-based testing, which looks for DNA changes, functional testing focuses on observed biological response. Cancer cells are exposed to different agents in the laboratory to evaluate whether they appear sensitive or resistant.
The goal is not to predict cure or guarantee effectiveness, but to provide additional insight when multiple treatment paths are being considered.
How Repurposed Drug Assay Works
The Repurposed Drug Assay process is designed to be coordinated through an integrative oncology provider in partnership with Datar Cancer Genetics.
Typical steps include:
- Test ordering through your medical provider
- Blood draw or sample collection coordination
- Laboratory isolation of patient-derived cancer cells
- Exposure to a curated panel of therapeutic agents
- A ranked sensitivity and resistance response report
- Clinical interpretation with your provider
Results may help guide more informed discussions with your care team, particularly when evaluating integrative or off-label strategies alongside standard treatment.
Why Repurposed Drug Assay Matters in Integrative Oncology
One reason some patients explore functional testing is the ability to evaluate repurposed drug panels. Repurposed drugs are medications that may already have established safety histories but are being investigated for potential roles in cancer care.
Within integrative oncology discussions, repurposed drug strategies are sometimes explored because they may offer:
- Known safety profiles from prior medical use
- Mechanistic targeting of certain cancer pathways
- Alignment with metabolic or supportive treatment approaches
- Additional perspectives beyond standard chemotherapy selection
Explore the full repurposed drug testing overview to learn more about this option and determine whether it aligns with your care goals.
Note: Laboratory sensitivity results do not guarantee clinical outcomes and should always be interpreted conservatively alongside oncology care.
Functional Testing Options: Datar and RGCC
Patients researching functional cancer testing may encounter more than one laboratory offering this type of analysis.
Two commonly discussed platforms include:
- Datar Cancer Genetics (ChemoScale platform)
- RGCC testing, often informally referred to by patients as the “Greek test.”
Both approaches share a similar clinical philosophy:
- Evaluating patient-derived cancer cells in a laboratory environment
- Exposing those cells to therapeutic agents
- Producing reports describing relative sensitivity or resistance patterns
Where they differ is mainly in testing methodology, panel structure, and reporting style.
For example:
Datar Cancer Genetics (ChemoScale)
- Uses circulating tumor-associated cells (C-TAC technology)
- Emphasizes structured functional response reporting
- May include both conventional and repurposed agents depending on panel design
RGCC Testing (“Greek Test”)
- Offers several different test panels
- May evaluate chemotherapy agents, natural compounds, and repurposed drugs
- Often used in integrative oncology settings internationally
Because each platform has unique features, some physicians view them as different tools that may be appropriate in different clinical contexts.
At Internal Health and Wellness MD, we help patients understand the available options so they can discuss which testing approach, if any, may best align with their care goals and medical situation.
Who This Testing May Be For (And Who It Is Not For)
The Repurposed Drug Assay may be considered for patients who:
- Are weighing multiple therapy options
- Have had limited response to prior treatment
- Want additional functional insight alongside standard oncology care
- Are exploring integrative repurposed-drug strategies
It is not intended to:
- Replace oncology treatment planning
- Predict outcomes or guarantee success
- Act as a standalone treatment decision
All decisions must remain grounded in collaboration with your primary oncology team.
How Doctors Use Functional Testing Results
Physicians may use functional testing as a decision-support tool to help:
- Personalize therapy selection conversations
- Avoid clearly ineffective regimens when possible
- Reduce unnecessary trial-and-error approaches
- Support integrative protocol refinement
- Provide clarity during complex decision-making
The value of this testing is not in promising treatment results, but in providing additional biological insight that can support informed decision-making.
Disclaimer: Repurposed Drug Assay testing is intended as a supportive educational tool only. It does not replace standard oncology care, diagnostic testing, imaging, or established treatment guidelines. Results do not guarantee outcomes and must be interpreted in collaboration with a licensed oncologist.
Frequently Asked Questions
This testing is often explored when patients are choosing between multiple options, seeking added personalization, or evaluating integrative strategies alongside standard oncology care.
Depending on the situation, testing coordinated through Datar Cancer Genetics may use blood-based cancer cells (C-TACs) or other clinically appropriate samples.
Results describe relative laboratory sensitivity or resistance patterns and must be reviewed alongside imaging, diagnostics, and oncology guidance.
A repurposed drug panel evaluates non-standard or off-label therapeutic agents against patient-derived cancer cells to help focus integrative strategies more intentionally.
Patients seeking integrative oncology support, additional personalization, or decision clarity alongside standard treatment often explore this option.
Interested in Exploring Repurposed Drug Assay Testing?
If you are seeking a more personalized and integrative approach to cancer care, Repurposed Drug Assay testing may offer additional insight to support informed conversations with your oncology team.
At Internal Healing and Wellness MD, we help patients understand their options clearly, coordinate appropriate testing, interpret results responsibly, and support care alongside standard oncology treatment. Interpret results responsibly, and support care alongside standard oncology treatment Contact us today to schedule a consultation and determine whether the Repurposed Drug Assay aligns with your care goals.
Relevant Studies and Clinical References
National Cancer Institute. (n.d.). Chemotherapy and cancer treatment. https://www.cancer.gov
