Stable but not shrinking — is treatment still working

Understanding Stable Lymphoma During Treatment

This is an important question, and the answer depends on several factors your care team will evaluate. Let me explain how doctors think about this situation.

What "Stable" Actually Means

When imaging shows your lymphoma is stable, it means the tumors aren't growing larger—they're staying roughly the same size. This is different from:

• Shrinking/responding - tumors are getting smaller
• Progressive - tumors are growing

Stability is actually a positive sign compared to progression, but it's not the same as a complete response.

How Doctors Evaluate Treatment Response

According to NCCN Guidelines for lymphoma, your care team typically considers:

1. Imaging findings - CT scans, PET scans, or PET/CT scans show whether tumors are shrinking, stable, or growing. As the NCCN Guidelines explain, PET scans use a radioactive tracer to detect cancer cells, and cancer cells show up as bright spots. Your radiologist compares current images to previous ones to track changes over time.

2. Molecular residual disease (MRD) testing - This newer blood test detects remaining cancer cells after treatment using circulating tumor DNA (ctDNA). According to recent NCCN Guidelines, MRD testing can identify molecular recurrence before tumors appear larger on imaging—sometimes detecting relapse up to 6-7 months earlier than PET/CT scans.

3. Your symptoms - Whether B symptoms (fever, night sweats, weight loss, fatigue) have improved or resolved

4. Blood work - Lymphocyte counts and other lab values

5. How long you've been on treatment - Some patients need more time to show response

Is Stable Treatment Still Working?

Yes, stability can indicate treatment is working, but context matters:

• Early in treatment: Stability in the first few cycles may be a good sign—the cancer isn't progressing while your body adjusts to therapy
• Later in treatment: If tumors remain stable after several cycles, your doctor may consider whether continuing the same treatment makes sense or if a change is needed
• Compared to before treatment: If your lymphoma was growing before treatment started and is now stable, that's meaningful improvement

Questions to Ask Your Oncology Team

Since your situation is specific to you, here are important questions:

1. "How does my current scan compare to my baseline scan before treatment started?" (This shows whether you've made progress, even if not shrinking)

2. "Based on my lymphoma type and stage, what response rate would you expect at this point in treatment?" (Different lymphoma types have different timelines)

3. "Would you recommend continuing this treatment, adjusting it, or considering MRD testing to look for molecular response?" (MRD can detect response that imaging might miss)

4. "Are my symptoms improving even if the tumors aren't shrinking?" (Clinical improvement matters)

5. "What would be your next step if the tumors start growing?" (Understanding the plan helps you feel prepared)

The Bottom Line

Stable lymphoma during treatment is not the same as treatment failure, but it also may not be the ideal response your doctor hoped for. The key is understanding:

• Where you started (was it growing before?)
• How long you've been treated
• Your specific lymphoma type
• Whether other markers (symptoms, blood work, possibly MRD) show improvement

Your oncologist has the complete picture of your case and can determine whether continuing, adjusting, or changing your treatment plan makes the most sense.

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This information is for educational purposes only. Always consult your healthcare team for personalized medical advice and decisions.