Doxycycline-Induced Changes in Circulating MMP or TIMP2 Levels Are Not Associated with Skeletal-Related Event-Free or Overall Survival in Patients with Bone Metastases from Breast Cancer. - Zhao H; Pond G; Simos D; Wang Z; Robertson S; Singh G; Vandermeer L; Clemons M; Addison CL (Cancers, 2023)