my ca 125 has risen from 10 to 13 to 15 over 10 weeks. I am currently on provera 250mg and tamoxifen for recurrent uterine cancer. I had a PET scan at the same time of the blood test which came back at 13 and it was clear. My tumours that were there around the liver had gone with no scaring. Can my ca125 just be fluctuating or does probably suggest my cancer is on its way back. I have been on hormones since January with a fabulous result and am 39 years