Breast cancer and travel insurance

Hi,

I have been given the ok to travel but struggling to find affordable travel insurance.  I have breast cancer which has spread to my spine.  I am on letrozole and palbociclib and don't know if this constitutes 2 types of treatment when trying to fill in forms for quotes or if I simply tick 'other treatment'.  Can anyone answer this question or can anyone suggest a suitable travel insurer?  Any help would be great. Thank you.