If chemotherapy doesn’t shrink a tumour, that doesn’t automatically mean the treatment failed. Sometimes the tumour’s simply stable, it’s stopped growing, which is still a meaningful outcome. Other times the treatment’s still working quietly in the background, controlling symptoms or slowing the cancer down, even without visible shrinkage on a scan. Doctors don’t judge this by size alone, they look at overall cancer activity through scans and blood markers together.
According to Dr. Sandeep Nayak, surgical oncologist in Bangalore with over 24 years of experience treating solid tumors, “Patients see a scan that says the tumour’s the same size and assume the worst, and I understand that reaction completely. But size isn’t the whole story. Some cancers respond to chemo by stopping in their tracks rather than shrinking, and that’s still a real response worth acting on, not a failure to panic over.”
Chemo not shrinking your tumour and unsure what that means?
Why "No Shrinkage" Doesn't Always Mean Failure?
- Swelling around the surgical site is the most common cause, and it settles down naturally as healing progresses.
- The breathing tube placed during anaesthesia can irritate the vocal cords slightly, unrelated to the surgery itself.
- The recurrent laryngeal nerve runs directly alongside the thyroid, so some stretching or bruising during surgery is fairly routine, even in straightforward cases.
- True nerve injury is far less common, and when it happens, it’s usually identified and discussed with you directly after surgery.
Surgeon experience with this specific nerve matters here more than people realise, and it’s something we’ve written about separately in Is Thyroid Cancer Curable With Surgery?, worth reading if voice change is a concern you had going into surgery.
What Happens Next If Chemo Genuinely Isn't Working
- If markers, scans, and symptoms all point to real progression, the treatment plan usually changes, different drugs, or a different approach entirely.
- Sometimes surgery moves up in the plan sooner than originally intended, particularly if the tumour’s operable as it stands.
- A second opinion at this stage is common and reasonable, not a sign that something’s gone wrong with your care so far.
- This decision always goes through a tumour board discussion, not one doctor’s judgment call alone.
This ties closely to how the order of chemo and surgery gets decided in the first place, something we’ve covered in Chemo First or Surgery First: How to Choose?, worth a read if you’re trying to understand where your treatment plan might go from here.
Why Choose Dr. Sandeep Nayak ?
Dr. Sandeep Nayak has spent more than two decades in surgical oncology, and treatment plans that need adjusting mid-course, when chemo isn’t doing what was hoped, have been part of that work throughout. He currently serves as Chairman of Oncology Services for Karnataka and heads Surgical Oncology and Robotic Surgery at KIMS Hospital, Bangalore. What tends to matter most to patients isn’t the title though, it’s that every case gets re-evaluated properly at a tumour board rather than one person deciding alone what “not working” actually means. That thoroughness is often where things get missed elsewhere.
Not sure if your treatment is actually working the way it should be? Don’t sit with that uncertainty. Call +91 9482202240 and get someone to actually walk you through it.
Frequently Asked Questions
Does a stable tumour mean chemo is working?
In many cases, yes. Stopping growth is a genuine response, not just the absence of one, though your care team will look at the full picture before drawing conclusions.
How often do doctors check if chemo is working?
Usually at set intervals, often every few cycles, using a combination of scans and blood markers rather than waiting until treatment’s fully done.
Will my treatment plan definitely change if the tumour hasn't shrunk?
Not necessarily. It depends on what the full picture shows, markers, imaging, symptoms, together, not size on its own.
Is it normal to get a second opinion at this stage?
Very normal, and reasonable. It’s not a sign your current care is wrong, just a way to make sure the plan going forward is the right one.
References
NCI — Imaging Response Criteria for Clinical
ASCO Educational Book — Tumor Response Assessment for Precision Cancer Therapy
Disclaimer: This blog is for informational and educational purposes only and is not a substitute for professional medical advice or diagnosis.
