i am grateful that we can go and continue the treatment and help my child who really needs it right now. but on the other side, i am so worried, as i'm leaving my two other kids behind. >> reporter: that is an impossible decision to have to make. >> translator: yes, but we have made it so far in the treatment and i have strong belief that our treatment will be successful. >> reporter: in another room, we met bogdan. is this your truck? at 2, he survived a heart attack, a stroke, and stomach cancer. now 8, the cancer's come back. his mother, natalia, is with him around the clock. >> translator: we have only gone through one course of ch chemotherapy. now we are doing more blood tests. so far, the results are not good. we're preparing for the second course of the therapy. you know, it is very difficult now and when the sirens go off, the doctors come and disconnect him from the treatment. >> reporter: what is it like to