Travel insurance with cancer

Hi, I wondered if anyone could advise me on who to go to for travel insurance for a cruise this summer to Norway or maybe Greece in October. I was diagnosed with endometrial cancer in April 2018 at stage1b grade 2 with lymohovascular space invasion, followed by hysterectomy, chemotherapy and radiotherapy and then found out in April 2019 it had spread to my abdomen and neck and was given 1 year prognosis. I then started a clinical trial and am still on it and doing well and the nodes have since reduced in size to within normal limits. It's my 60th birthday this year and my husband would like to take me on a short cruise to celebrate my 60th and the fact that my cancer seems to have gone into remission although I am still on the trial. My worry is that no insurance company will I sure me or that cost will be prohibitive and I am asking if anyone has had experience of travelling abroad with cancer while still under treatment? Thank you in advance. Leanne