I can understand your anger however, I am sure Samantha does not believe that USA is the only country that exists. She does state that she has had family experience with cancer so does not intend offending. Anyone who has been affected by this disease would not be so despicable.
As for the emotions I can relate to your being down. However please remember that I did not expect to survive 1 year let alone 5 and still here 8 year later, having a recurrence of it in my lung and further treatment.
Even though it may be hard at times do try to be tolerant, many times it is easy to just look on the bad side because of our situation. Try to give people the benefit of the doubt life is to short as WE know.
As for your reoccurrence if you check my blog you will see this happened to me and not doubt will happen again in the future. But every day, week, year is an extra gift so I try to give back help and hope to people. I know I am very lucky but others are too you may hopefully be one of them too. gratitude I have been .