I had 6cm breast cancer lump. My treatment was 6 chemo sessions then a lumpectomy. I gave up after five chemo sessions as I couldn't take side effects any longer. I had my CT mammogram last week, and seen my surgeon today. The lump is now 5cm but full of holes. Like Swiss cheese is how he described it. I've decided to have mastectomy as he said he can't guarantee he can get all cancer out with just a lumpectomy. He can try bc a lumpectomy, but if it doesn't get all cancer I'll have to have a mastectomy anyway. My boobs are too big, and I'm hoping I can have a breast reduction on my other boob and have a smaller reconstruct boob. I don't know if that's even possible on NHS. He did say he would reduce my other boob if a lumpectomy was successful so the would match. So hoping he can do same with a mastectomy. I wanted a mastectomy when I first found out I had a lump and breast cancer but was persuaded that chemo was a better option as it may reduce lump considerably and would then only need a small lumpectomy. It didn't go to plan though and I feel went through chemo for nothing :/