 - FOR PATIENTS ENROLLED IN EAY131 NCI-MATCH PRIOR TO EAY131 ADDENDUM 10 ONLY: Patients must have histologically confirmed rare cancer that did not have a match to a molecularly-guided therapy on EAY131 NCI-MATCH protocol or who are off protocol treatment on EAY131, NCI-MATCH and have no further molecularly-matched treatment recommendations per EAY131, NCI-MATCH or who are otherwise unable to receive EAY131, NCI-MATCH therapy 