The difference between basic, translational and clinical research

When I started as a researcher, I had no idea that there were different types of research.  I don’t mean that some scientists study cancer and some scientists study Alzheimer’s disease.  I mean entirely different kinds of research that have fundamentally different methods, sources of funding, and purposes. Today’s post is going to outline three main types of research in the biological sciences: basic, translational and clinical research.

Basic Research:


By en:User:AllyUnion, User:Stannered (en:Image:Science-symbol2.png) [CC BY 3.0 or GFDL], via Wikimedia Commons

 Right off the bat, I need to be super clear that basic research is NOT research that’s easier to do or simpler than any other type of research.  It is just as complex and just as hypothesis-oriented as other types of research.  However, the goal of basic research is to  understand at a very basic level some aspect of biology.  Also called fundamental research, basic research doesn’t require that the outcome of the research can cure a disease or fix a problem.  That being said, basic research often does create the foundation that is required for other researchers to apply to solving a problem. I like how basic research is described on WIkipedia as “Basic research generates new ideas, principles, and theories, which may not be immediately utilized but nonetheless form the basis of progress and development in different fields”  This research can be in biology, physics, math, environmental sciences or any other scientific field. So what are some examples of basic research in biology?

  • Understanding the proteins and pathways that result in cells dying by apoptosis
  • Developing technology to better determine the 3D structure of proteins.
  • Creating mathematical models representing population growth in cities over time
  • Studying how leaf litter affects the ecosystem (an actual active funded grant at TGen here in Arizona)

This research is often funded by the government, specifically the National Institutes of Health, which funds 50,000 grants to more than 300,000 researchers at more than 2,500 institutions around the world, and the National Science Foundation, which funds 24% of all federally-funded basic science research in the United States.

Translational Research:


By Maggie Bartlett, NHGRI. [Public domain], via Wikimedia Commons

Translational research is how basic research and biological knowledge is translated into the clinic.  Often called “bench-to-bedside” or research (referring to the research bench and the patient’s bedside) or “applied” research (of applying basic research to solve a real-world problem), this research is needed to show that a drug or device works in some living system before it is used on humans. This is the research that happens after the results from basic research are obtained and before clinical research.

For example, if a drug is found in the lab that targets a protein that is thought to cause a disease like cancer, the drug will first be tested on animal models.  The animal model may be a mouse that has been genetically altered so that it develops that specific kind of cancer or a mouse that has human cancer cells injected into it (like the patient derived xenografts I described in a previous post). The drug will then be used on the animal to see if it is safe or if low doses are so toxic that the animal dies. Whether or not the drug hits the targeted protein or cell type can also be tested in mice.  For example, if the drug is supposed to kill brain tumor cells, researchers would want to make sure the drug was able to pass the blood brain barrier of the mouse.  Finally, if the drug is supposed to kill tumor cells, researchers would want to check that the tumor shrinks, the cells die, and/or that the survival of the mouse is extended from using this treatment. Often, drugs are “weeded out” at the translational research stage saving millions of dollars and years worth of time and effort in clinical trials.

Translational research isn’t just for drug development.  It is also useful for devices. For example, to develop a device that can diagnose diseases in third world countries, where access to electricity and high tech labs is more difficult.

Clinical Research:


By Tannim101 [CC BY 3.0, GFDL or CC BY 3.0], via Wikimedia Commons

Clinical research is what is performed in a healthcare environment to test the safety and effectiveness of drugs, diagnostic tests, and devices that could be used in the detection, treatment, prevention or tracking of a disease.  The cornerstone of clinical research is the clinical trial.  There are 4 basic phases to a clinical trial.  Each phase is performed sequentially to systematically study the drug or device.

  • Phase I: This is the first time the drug or device has been in humans and it is used on a small number of patients in low doses to see whether or not it is safe and what the side-effects may be. At this point, the clinicians are not trying to determine if the treatment works or not.
  • Phase II: In this phase, more patients are treated with the device or drug to test safety (because more side effects may be identified in a larger, more diverse population) and whether the drug or device is effective (in other words, does it work?).
  • Phase III: This is the phase that focuses on whether the drug or device is effective compared to what is typically already used to treat patients.  It’s used on a large group of people and “end points” like increase in survival or decrease in tumor size are used to evaluate its effectiveness.
  • Phase IV: These trials are done after the drug has gone to market to see if it works in various populations .

There are several different types of clinical trials depending on who is funding them. Some clinical trials can be initiated by a doctor or group of doctors.  These are call “physician-initiated” or “investigator -initiated”  studies and are often used to determine which type of treatment works better in patient care.  For example, there may be two treatments that are commonly used to treat a disease. Investigators may initiate a study to figure out what treatment works better in what patient population.

The kind of clinical research you may be more familiar with are drug companies who are working to develop a drug or device.  These companies will “sponsor” (aka “pay for”) a clinical trial.  They work with clinicians at one or more medical institutes to use their drug or device in a particular way (depending on the phase of the trial) and the clinicians report back the results, including whether there were any side effects to the treatment. At the end of the clinical trial, if the treatment or device was a success, the drug company can apply to the Food and Drug Administration (FDA) for approval to use the drug in the general population.  Bringing a drug to market is a timely and extremely expensive process estimated at over 10 years and $1.3 Billion dollars per drug. Much of this time and cost is due to high cost of conducting the clinical trials.

If you are interested in what clinical trials are currently available in the United States, all clinical trials are registered on  Anyone can search this database to see if trials are available for them to participate in.

Overall, each type of research needs to understand the other, and researchers need to work together to successfully understand our world and to come up with solutions to prevent, diagnose and cure disease.

4 thoughts on “The difference between basic, translational and clinical research

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