Hi Daisy,
Again, I can't answer all your questions, but I too had a lump which they measured as 5cm before MRI. After MRI, it was measured as1.5cm by 1.4cm, but when it was removed, it actually was 3.7cm!. All this had to do with the fact that My cancer was lobular, which is often bigger on removal due to the way it grows. What could be felt was the 1.5cm core of the cancer, and with all the muscle and fat on top of it, it made it look much larger. It will all depend how deep the lump is in your mums breast.
I didn't have a CT scan, but my friend (who had node involvement) did and her CT scan was done just before chemo commenced.
I did undergo chemo and my hair started to fall out about 17 days after my first fec treatment. I decided against the cold cap, so perhaps your mum would like to try that, if hair loss is an added worry? I believe that it doesn't always work,but the nurses in the chemo suite will be able to give her all the info on that. My advice for chemo is to drink plenty of water the day before and day of chemo as this helps flush the drugs through your system. I drank half a litre of water while being infused, and although I did have side effects, they were pretty minimal. But I must point out that I was on FEC75, which is a reduced version of FEC-T, so perhaps I'm not the best person to give advice on this one either!
I am now on tamoxifen and my marker results were ER+7, PR+8 and HER-. I would have thought that an ER+5 would have meant that your mum would benefit from taking tamoxifen. There was a comment on this site from a lady who was only ER+2 who decided against taking tamoxifen because her oncologist was unsure whether the side effects outweighed the benefits. Ask you oncologist, they should give you the facts and help your mum make an informed choice. I will be on tamoxifen for a minimum of 5 years, and this may be extended to 10 years, and I'm led to believe that that's the norm.
I hope I have answered some of your questions and wish your mum all the best through her treatment.
Take care, Ann x x x