No one has reported this number since almost 6 months ago.  They called once yesterday, then twice today here in middle Georgia. Left no message. CallerID is AM CHILD CAN FD.
Here is the other number they will use to make repeated calls, even if they know you've blocked their ring:
http://800notes.com/Phone.aspx/1-478-974-5158
... according to T.C.'s good information above.

It's alive and well as of Aug. 25, 2016.  My tele-spam trap caught it.

American Children's Cancer Fund has been among the top 10 long-term charity scams for several years.  It's an offshoot of prior scams involving some of the same people.  They take huge paychecks and buy luxury trips, accommodations, property, etc., for their own personal gain using the money donated to them on the phone.