What Is a Principal Investigator in a Clinical Trial? A Guide for Physicians New to Research

If you're a physician considering clinical research for the first time, you'll quickly encounter a new title: Principal Investigator, usually shortened to PI.

The title can sound more complicated than it is.

The Principal Investigator is the physician responsible for conducting the clinical trial at the research site. The PI provides medical leadership and oversight and helps ensure that the study is conducted appropriately and that research participants are protected.

That is a meaningful responsibility.

But becoming a PI doesn't mean you suddenly need to run every operational aspect of a clinical trial yourself.

Understanding what the PI is responsible for—and what can be supported by an experienced research team—is an important first step for physicians considering research.

What Does a Principal Investigator Do?

At the site level, the PI is responsible for the conduct of the clinical trial.

That means the investigator needs to understand the study, oversee the research team, provide appropriate medical care and decision-making, and make sure the trial is conducted according to the study protocol and applicable requirements.

Depending on the study, the PI's responsibilities may include reviewing the protocol, completing required training, evaluating potential participants, performing or overseeing clinical assessments, reviewing safety information, assessing adverse events, reviewing study data and providing ongoing oversight of the research team.

Some responsibilities require the investigator's direct involvement.

Many other study activities can be delegated to qualified members of the research team.

What Does "Investigator Oversight" Actually Mean?

Oversight is one of the most important concepts for a new PI to understand.

Clinical trials involve many people. A study may include clinical research coordinators, regulatory specialists, pharmacists, nurses, laboratory personnel, data specialists and other professionals.

The PI isn't expected to personally perform every activity.

Instead, the investigator makes sure that study responsibilities are assigned appropriately, that team members are qualified and trained for the work they perform, and that the trial is being conducted properly.

For example, a research coordinator may schedule study visits, enter information into a study database, maintain study documents and communicate with the sponsor.

The PI doesn't need to sit beside the coordinator while those tasks are performed.

But the investigator does need to remain sufficiently involved to provide meaningful oversight of the study.

Can a PI Delegate Responsibilities?

Yes.

Delegation is fundamental to how clinical research sites operate.

Many trial activities can be assigned to qualified research staff. Exactly what can be delegated depends on the study, the individual's qualifications, applicable requirements, and the site's procedures.

The important distinction is this:

Tasks can be delegated. Responsibility for appropriate oversight cannot.

That's why an experienced research team can be so valuable to a physician who is new to research.

The team handles many of the operational details while helping the investigator remain informed about the areas requiring PI attention.

What Does a Clinical Research Coordinator Do for the PI?

The clinical research coordinator, or CRC, is often the person the PI works with most closely.

A CRC may coordinate participant visits, track study requirements, prepare documents for investigator review, communicate with sponsors and Clinical Research Organizations (CROs), maintain study records, enter data, respond to queries, prepare for monitoring visits and keep the investigator aware of upcoming deadlines or required actions.

A strong coordinator does more than complete tasks.

They help keep the investigator organized.

For a busy physician, that distinction matters.

Instead of expecting the physician to remember every research deadline, system login, document request or upcoming study requirement, the research team helps bring the items requiring physician attention to the PI.

Does the PI Have to Handle the IRB?

Clinical trials involving human participants generally involve oversight by an Institutional Review Board (IRB).

The IRB reviews research to help protect the rights and welfare of participants.

There can be substantial administrative work associated with IRB submissions and ongoing study maintenance.

Research staff can often prepare and coordinate much of that work.

The physician investigator, however, remains responsible for understanding the research being conducted and completing investigator-specific reviews, attestations, signatures or other actions when required.

In other words, the PI doesn't necessarily have to become the site's IRB administrator.

But the PI cannot be disconnected from the process.

What About Informed Consent?

Informed consent is much more than obtaining a patient's signature on a form.

Potential participants need to receive appropriate information about the study and have an opportunity to ask questions before deciding whether to participate.

Research staff may play a significant role in coordinating and conducting the consent process when appropriately qualified and permitted to do so.

But the investigator remains responsible for ensuring that informed consent is handled appropriately and that participants receive the medical information they need to make an informed decision.

For physicians new to research, this is an important mindset shift.

A clinical trial participant is still your patient—but they are also a research participant with additional protections and rights.

Is Being a PI a Major Time Commitment?

It can be, but the workload varies considerably by study.

A complex treatment trial may require substantially more physician involvement than a relatively simple observational study. The number of participants enrolled at your site also affects workload.

This is why physicians should understand their expected responsibilities before agreeing to participate in a trial.

Ask what procedures require PI involvement. Ask how frequently participants will be seen. Ask what safety assessments are required. Ask what documentation requires physician review.

And ask who will manage everything else.

A good research team should be able to answer those questions before the study begins.

Can I Be a PI If I've Never Done Research Before?

Previous clinical trial experience can certainly be valuable, and individual sponsors and studies may have their own expectations when selecting investigators.

But being new to clinical research doesn't automatically mean a physician cannot participate.

Clinical expertise, an appropriate patient population, willingness to learn, sufficient availability, and a strong research infrastructure all matter.

The key is not pretending that clinical expertise automatically translates into research expertise.

It doesn't.

A physician new to research should receive appropriate training and have experienced people around them who understand the operational and regulatory requirements of clinical trials.

That combination allows the physician to learn research while remaining focused on the part of the study that most needs a physician: patient care, medical judgment, safety and investigator oversight.

You Don't Have to Become a Research Operations Expert

The term "Principal Investigator" can sound intimidating when you're considering your first clinical trial.

It shouldn't.

Being a PI carries real responsibilities, but it doesn't require a physician to personally build and operate an entire research department.

That's where the research team comes in.

A strong research infrastructure allows the PI to remain actively and appropriately involved without spending valuable clinical time managing every administrative detail associated with the trial.

Interested in Becoming a Clinical Trial Investigator?

Altitude Clinical Research works with physicians who are experienced clinicians but may be new to clinical research.

We provide the research infrastructure and operational support needed to help physicians and their practices participate in clinical trials while keeping investigator responsibilities where they belong—with the physician.

If you're interested in becoming a clinical trial investigator, talk with the Altitude Clinical Research team about your practice, your patients, and the types of research opportunities that may be a good fit.