Methods of delivering an agent in a tissue-specific manner, by targeting annexin A1, a derivative of annexin A1, or a binding partner of annexin A1, are described. The methods can be used for detecting, imaging and/or treating neoplasia, angiogenesis or neovasculature, as well as for diagnostics and methods of assessing treatment efficacy. Antibodies to annexin A1 are also described, as are methods screening for agents altering annexin A1 activity.