My little brother has a tumor at the upper of his back at the medial line just down to the beck , its kind of bony and large ,I'm afraid it maybe cancer...
I thinking about taking him to cancer test but I want to take your advice first...

Your parents take him to a doctor first.

Consult doctor but I don't think it's cancer.

Ok ,my dad took him to a doctor , and he made a X ray
The doctor says its probably because of holding heavy school bag and not sporting well, and he's overweight, but I'm still worried , I can't trust him because I didn't hear about somebody develop a humor because he is carrying a bag! My parents think I'm giving the thing more attention more than required...
I'm think about taking him secretly to cancer test... I have to say that my aunt died of cancer...

Why do you think it's a tumor and why do you think it's cancer? Aren't you going a little overboard here?

If you feel then do take the cancer test. But I still think it's not. There are many cases of such, back tumors or lumps removed after surgery.

One cannot do a "cancer test" without a doctor's orders. If a doctor does not feel there is cancer they will not order such a test.