13D Filing: James E. Flynn and Proteon Therapeutics Inc (PRTO)

Page 19 of 21

Schedule A

Schedule A to the 13D is hereby amended by adding the following:

General Partner of Deerfield Mgmt IV,
L.P.

The general partner of Deerfield Mgmt IV is J.E. Flynn Capital
IV, LLC.  The address of the principal business and/or principal office of each of Deerfield Mgmt IV and J.E. Flynn Capital
IV, LLC is 780 Third Avenue, 37th Floor, New York, New York 10017.

General Partner of Deerfield Private
Design Fund IV, L.P.

The general partner of Deerfield Private Design Fund IV is Deerfield
Mgmt IV. The address of the principal business and/or principal office of Deerfield Mgmt IV and Deerfield Private Design Fund IV
is 780 Third Avenue, 37^th Floor, New York, New York 10017.