Hi Rach,
I can't offer reassurance from 10 yrs + as I'm still undergoing treatment but you might find my story helpful.
My initial tumour size was 15cm (!!!!) and the treatment plan was 4 x FEC, 12 x weekly Paclitaxol followed my Mx and ANC (at least 4-5 nodes affected at diagnosis) then 3 weeks of rads.
I had a scan after completeing the FEC and the tumour had reduced to just 4cm, it was marked with a clip in case it vanished completely before surgery. I then switched to the Taxol and had 5 weeks of that before having another scan where it was found that the tumour was beginning to grow again.
I was given 3 options:
1. Continue with the Taxol as planned as it could still be having a positive effect away from the tumour site
2. Switch back to FEC or to another chemo drug and hope for more shrinkage (but no guarantee)
3. Stop chemo and continue with the rest of the treatment plan then consider more chemo after radiotherapy was complete.
I opted for no3 as I didn't want to lose the window of opportunity for surgery given the size of my original tumour. Mx was successful with wide margins and the pathology showed that all my lymph nodes were tumour free due to the chemo. I had radiotherapy and am now part way through 3 more cycles of FEC as a precautionary measure as I didn't have a full course of chemo initially.
So based on my experience I'd say that unless your mum had a scan before switching chemo there is no way to be sure that both the FEC and the Docitaxol were ineffective and even if they didn't help the initial tumour they may have cleared any distant cells.
Has your mum had any scan to check for secondaries - I had MRI, bone and CT scans at diagnosis - and were any nodes affected? If they were all clear and they got clear margins with the mastectomy then there is a good chance that she is cancer free and even though the chemo may reduce the likelihood of recurrance there is still a good chance that she will have no further problems especially as she will be having herceptin to improve her odds.
The scan I had when my tumour started to grow showed that there were some areas of dead tissue within the tumour so I would ask if the pathology report gives any info as to whether the chemo had any effect on the tumour cells. There may have been more benefit than is immediately apparent.
If your Mum has had the tumour removed, nodes are clear (or have been cleared) and scans are clear then, regardless of what the future may hold, she has no evidence of disease (NED) which is where we would all like to be. Hold onto that and concentrate on treatments (rads, herceptin) that can help keep it that way rather than worrying about ones that may not.
Remember that many people have chemo after surgery, there are probably a number of them for whom it is also ineffective but they have no way of knowing, their situation is the same as your mum's they just don't know it. It doesn't make any difference to their treatment.
Good luck to your Mum (and you) with the rest of her treatment.
Linda
xx
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