X0306 4 2015-03-20 0 0001036968 diaDexus, Inc. DDXS 0001233539 PATTERSON LEONE D C/O DIADEXUS, INC. 349 OYSTER POINT BLVD. SOUTH SAN FRANCISCO CA 94080 0 1 0 0 Chief Financial Officer Stock Option (Right to Buy) 0.37 2015-03-20 4 A 0 700000 0.00 A 2025-03-19 Common Stock 700000 700000 D 25% of the shares subject to this option vest and become exercisable on January 22, 2016. The remaining shares subject to this option vest and become exercisable in 36 equal monthly installments thereafter, so that the entire number of shares subject to this option become fully vested and exercisable on January 22, 2019. /s/ Leone Patterson 2015-03-24