The article notes it was a rare form of cancer, accounting for only 0.1% of cases.
The doctors reported that the patient died three weeks later from complications of refractory hypercalcemia — dangerously high calcium levels in the blood that do not fall in response to standard treatments. This condition is often, but not always, tied to cancer.
This also goes for those of us diagnosed at a young age but our parents only saw it as "they can't pay attention" and give no support whatsoever. When I began to understand what ADD really is, I was already in my 30s.
Oh yeah good catch.