Cancer Clinical Trials Explained: Should You Participate? (Part 2)

This is Part 2 of our clinical trials guide. If you haven’t read it yet, Part 1 covers what trials are, the common myths, the four phases, and the trade-offs. This part focuses on the decision: eligibility, the questions to ask, and what to do if you don’t qualify.

Understanding trial eligibility criteria

Every trial has strict inclusion criteria (what you must have) and exclusion criteria (what disqualifies you).

Common inclusion criteria

• Specific cancer type and subtype
• Specific stage (metastatic, early-stage, etc.)
• Specific biomarkers (EGFR mutation, PD-L1 expression, etc.)
• Age range
• Performance status (ECOG 0 to 1, meaning able to perform daily activities)
• Adequate organ function (liver, kidney, bone marrow)
• Previous treatment history (sometimes need specific prior treatments, sometimes can’t have had any)

Common exclusion criteria

• Other active cancers
• Brain metastases (though some trials now include these)
• Poor organ function
• Autoimmune diseases (for immunotherapy trials)
• Recent heart attack or serious heart disease
• Pregnant or breastfeeding
• HIV, hepatitis (though changing for some trials)
• Recent surgery (within certain timeframe)

Frustration alert: You might match 90% of criteria but be excluded for one factor.

Why so strict?

• Safety: Protect participants from treatments that might harm them
• Scientific rigor: Reduce variables to better understand the treatment
• Regulatory requirements: FDA requires specific trial designs

Important: Criteria sometimes relax as trials progress and more safety data is available.

Questions to ask before enrolling in a trial

About the trial design

• “What phase is this trial, and what is its primary goal?”
• “Is this trial randomized? If so, what are the different arms?” (Make sure you’d be comfortable receiving ANY arm of the study.)
• “Will I know which treatment I’m receiving?” (Some trials are blinded, some are open-label.)
• “How many patients will be enrolled in this trial?” (Larger trials are generally more definitive.)
• “What is the rationale for this treatment? What earlier results suggest it might work?” (Look for Phase 2 data if it’s a Phase 3 trial. Ask about response rates in earlier phases.)

About the treatment

• “What does the treatment involve?” (How is it given? Oral pill, IV infusion, etc. How often? For how long? Where? At home, in clinic, hospital?)
• “What are the known and potential side effects?” (Common side effects, serious side effects, unknown risks especially in Phase 1 to 2.)
• “How does this compare to the standard treatment I would otherwise receive?”
• “What happens if I have severe side effects? Can the dose be adjusted?”
• “What other medications or treatments can’t I take while on this trial?” (Some trials prohibit certain supplements, other medications.)

About logistics

• “How often will I need to come for appointments?” (Weekly? Monthly? More frequent than standard care?)
• “Where do I need to go for treatment and follow-up?” (Can any visits be at my local oncologist? What must be at the trial site?)
• “How long is the trial expected to last?” (Treatment period and follow-up period.)
• “What costs will I be responsible for?” (Trial covers experimental drug, but what about other costs? Will insurance cover routine care costs? Are there programs to help with travel/lodging?)

About outcomes and next steps

• “What happens when the trial ends?” (Can I continue receiving the treatment if it’s helping? What are the next treatment options?)
• “What if the treatment doesn’t work? Can I leave the trial and pursue other treatments?” (You can ALWAYS leave a trial. But good to understand the process.)
• “Will I find out the results of the trial?” (Some trials share results with participants. Timeline: trials can take years to complete and publish.)
• “Can I continue seeing my regular oncologist?” (Most trials encourage coordination with your regular team.)

About safety and oversight

• “Who is sponsoring this trial, and who is overseeing safety?” (Pharmaceutical company, NCI, academic institution? IRB approval? Data Safety Monitoring Board?)
• “What happens if I’m harmed by the trial treatment?” (What care is provided? Is there compensation?)

The informed consent process

Before enrolling, you’ll go through informed consent.

What it includes

Written consent form (often 20 to 30 pages) explaining:

• Purpose of the trial
• What you’ll be asked to do
• Treatments you might receive
• Known risks and benefits
• Alternative treatments
• Your rights
• Privacy protections
• Costs

Verbal explanation from:

• Principal investigator (lead doctor)
• Research nurse
• Clinical trial coordinator

Time to consider (never rush):

• Take the consent form home
• Review with family
• Discuss with your regular oncologist
• Ask questions
• No pressure to decide immediately

Your rights

• Right to ask questions (any and all questions)
• Right to take time to decide
• Right to discuss with others (family, your oncologist, second opinion)
• Right to refuse without affecting your standard care
• Right to leave the trial at any time, for any reason, without penalty
• Right to receive all information about risks and benefits

Important: Signing consent is NOT a final commitment. You can withdraw at any time.

Making your decision: should you join this trial?

Consider “Yes” if:

• You meet all eligibility criteria
• You’d be comfortable with ANY arm of a randomized trial
• The trial offers a treatment potentially better than standard care
• The logistics are manageable (location, time commitment)
• You understand and accept the risks
• Your regular oncologist supports the decision
• The trial aligns with your goals and values

Consider “No” or “Not yet” if:

• You’re not comfortable with the randomization or trial design
• The logistics are prohibitive (distance, time away from work/family)
• You have concerns about risks that haven’t been adequately addressed
• Standard treatment is highly effective for your cancer
• You haven’t fully explored standard options
• Your intuition says it’s not right

Consider getting a second opinion about the trial

Many patients benefit from discussing the trial with:

• Their regular oncologist (if the trial is elsewhere)
• Another oncologist at a different institution
• A patient advocate familiar with trials
• AI-powered tools that can summarize how the trial compares to standard options

Remember: This is YOUR decision. No one should pressure you either way.

What happens if you join a trial

Enrollment process

1. Screening: Additional tests to confirm eligibility (blood work, scans, biopsies, other testing per protocol)
2. Baseline assessment: Establish your starting point (detailed medical history, physical exam, quality of life questionnaires, tumor measurements)
3. Randomization (if applicable): Assignment to treatment arm
4. Treatment begins: Following strict protocol schedule

During the trial

Regular monitoring:

• More frequent appointments than standard care typically
• Blood tests, scans, physical exams per protocol schedule
• Side effect assessment and management
• Quality of life questionnaires
• Diaries or logs (some trials)

Strict adherence required:

• Taking medication exactly as prescribed
• Attending all appointments
• Reporting all side effects
• Not taking prohibited medications

Communication:

• Regular contact with trial team
• 24/7 emergency contact for serious issues
• Coordination with your regular oncologist

Your ongoing rights

• Continue asking questions
• Report any side effects or concerns
• Request to speak with the principal investigator
• Leave the trial if you choose
• Access your medical records

What if you don’t qualify for any trials?

Many patients are disappointed to find they don’t meet eligibility criteria. Options:

Expand your search

• Look at trials at multiple institutions
• Consider trials for related cancers
• Check for “basket trials” (target specific mutations regardless of cancer type)
• Look at prevention or supportive care trials

Ask about compassionate use

• Expanded access programs may provide experimental drugs outside trials
• For patients with serious conditions who’ve exhausted other options
• Contact drug manufacturers
• Your oncologist can apply on your behalf

Focus on optimizing standard care

• Not being in a trial doesn’t mean inferior care
• Standard treatments are proven effective
• Consider comprehensive genomic testing to personalize standard approaches
• Optimize supportive care

Keep checking

• New trials open regularly
• Your eligibility may change as your treatment evolves
• Set up alerts on ClinicalTrials.gov for your cancer type

Special types of trials to know about

Basket trials

What they are: Trials that accept multiple cancer types sharing a specific genetic mutation.

Example:

• Trial for any cancer with NTRK fusion
• Trial for any tumor with high microsatellite instability

Advantage: Expands options for rare mutations regardless of cancer type.

Umbrella trials

What they are: Multiple sub-studies under one master protocol.

How it works:

• All participants undergo genomic testing
• Assigned to sub-study based on their mutations
• Receive matched targeted therapy

Examples: NCI-MATCH, Lung-MAP.

Advantage: Personalized matching to treatment based on your tumor’s specific characteristics.

Window of opportunity trials

What they are: Brief treatment before planned surgery.

Purpose:

• See if treatment shrinks tumor
• Study how treatment affects tumor biology
• Doesn’t delay your surgery

Advantage: Contribute to research without changing your standard treatment plan.

Neoadjuvant trials

What they are: Treatment BEFORE surgery (instead of or in addition to standard neoadjuvant therapy).

Purpose:

• Shrink tumor to make surgery easier
• Treat microscopic disease early
• Test treatment response

Example: Immunotherapy before surgery for certain cancers.

The bottom line: clinical trials and you

Clinical trials are how cancer care advances. Every effective treatment available today started in a clinical trial.

Should you participate? Consider it if:

• You want access to cutting-edge treatments
• You’re comfortable with the trial design and logistics
• You understand and accept the risks
• You want to contribute to advancing cancer care

It’s also perfectly okay to choose standard treatment if:

• Standard treatment is highly effective for your cancer
• Trial logistics are prohibitive
• You’re not comfortable with uncertainties
• Your personal situation makes trial participation difficult

Key points to remember

• Trials are NOT just for desperate situations; many are for newly diagnosed patients
• You rarely receive a placebo in cancer trials; usually comparing active treatments
• You can leave at any time; enrollment is not a permanent commitment
• Trials offer intensive monitoring; often more careful follow-up than standard care
• Ask questions, lots of them, before making any decision
• Get a second opinion about whether a trial is right for you
• Your regular oncologist should support you whether you choose trial or standard care

Finding the right trial

• Start with your oncologist
• Search ClinicalTrials.gov
• Contact disease-specific organizations
• Use trial matching services
• Consider AI-powered matching for comprehensive search (we wrote about the foundation model we’re building over 11M patient journeys that powers this kind of search)

Making your decision

• Take your time (when medically safe to do so)
• Read the full consent form
• Discuss with family and your care team
• Trust your instincts
• Make sure it aligns with your goals and values

Cancer treatment is increasingly personalized. Clinical trials are one way to access the most personalized, cutting-edge approaches, but they’re not the only path to excellent care.

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About Radical Health

We're building an AI nurse navigator that delivers personalized expert reports so every cancer patient gets clear, evidence-based answers about their case, regardless of where they live. Our AI platform analyzes over 10 million patient records and is overseen by oncologists from UCSF, MSK, UCLA, and Johns Hopkins. Learn more about AI-powered personalized reports at radicalhealth.ai.

Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult with qualified healthcare providers about your specific diagnosis and treatment options.