Dear Ching To Chang, ofcourse I think this kind of social network for cancer patients app is very useful. My mother is one of cancer patient as well. Many years ago at the beginning of her therapy, she really need the consultant who have the same feeling as her, so she participated in the Cancer group in Facebook and she got well encourages from friends and also the useful information and knowledge related to her situation. The supporting group is really important and to put it into app is the very good idea. Wishing you well soon!!!