The context of the following conversation is Kai got a check up from the doctor after finding a lump and got the all clear so when leaving the surgery Kai felt well.:
Kai says My doctor checked out my lump and had surgery.  I feel all better now..
The friend responds That's good that you had it removed..
Kai responds It wasn't cancerous, but I wanted it removed, just to be safe..
The friend responds You have to watch out for lumps..
Kai responds Cancer runs in my family so I am extra careful..
The friend responds I have cancer in my family too..