Anyone had first line docetaxel not work?

Hi everyone 

I’ve recently finished 6 cycles of docetaxel after being diagnosed with mets to lung, liver and low volume to one hip and rib. A scan a week after finishing chemo showed some progression in liver and a 2mm progression on lung. Obviously my oncologist and myself were disappointed with this, he said some of cancer is under control but clearly some isn’t. I am continuing on herceptin and perjeta which I had along side chemo anyway and I’ve just started letrozole. Has anyone else been in similar situation?

Forgot to add, my bloods showed a dramatic drop in tumour markers from over 800 before treatment began to under 400.