BACKGROUND: Exposure to anti-angiogenic thrombospondin-1 (TSP-1) mimetic peptides (MPs) has resulted in sporadic anti-tumor activity in humans and dogs. HYPOTHESIS: Novel TSP-1 MPs formulations will be safe, tolerated, and clinically active in soft tissue sarcoma (STS) in dogs. ANIMALS: Sixty-two client-owned dogs with measurable STS were enrolled, excluding hemangiosarcoma. METHODS: A prospective, single agent, multicenter, open-label study assessing ABT-510 bolus, ABT-898 bolus, or ABT-898 depot formulations of TSP-1 in dogs. Endpoints included tolerability, antitumor activity, and the assessment of ability of clinical covariates and circulating endothelial cells (CEC) concentration to predict tumor response. RESULTS: Two non-dose-limiting toxicoses possibly attributed to treatment were observed (keratitis and osteoarthritis). Antitumor activity (10/44 = 23% responses) was observed in study subjects who received treatment for >28 days (n = 44) including both partial (7) and minimal responses (3). Responses were disproportionately seen in dogs receiving ABT-898 formulations (9/28 = 32%) versus those receiving ABT-510 (1/16 = 6%; P < .045). Disease stabilization for >84 days was also documented (8/44 = 18%). Slow rates of tumor progression before study entry correlated with anti-tumor activity in treated dogs, whereas no significant association was found between changes in total CEC concentration and tumor response (P = .28) or time to progression (P = .42). CONCLUSIONS AND CLINICAL IMPORTANCE: Safely achieved antitumor activity was documented with TSP-1 MPs in dogs with STS. The most notable activity was achieved with the ABT-898 formulations.
BACKGROUND: Exposure to anti-angiogenic thrombospondin-1 (TSP-1) mimetic peptides (MPs) has resulted in sporadic anti-tumor activity in humans and dogs. HYPOTHESIS: Novel TSP-1 MPs formulations will be safe, tolerated, and clinically active in soft tissue sarcoma (STS) in dogs. ANIMALS: Sixty-two client-owned dogs with measurable STS were enrolled, excluding hemangiosarcoma. METHODS: A prospective, single agent, multicenter, open-label study assessing ABT-510 bolus, ABT-898 bolus, or ABT-898 depot formulations of TSP-1 in dogs. Endpoints included tolerability, antitumor activity, and the assessment of ability of clinical covariates and circulating endothelial cells (CEC) concentration to predict tumor response. RESULTS: Two non-dose-limiting toxicoses possibly attributed to treatment were observed (keratitis and osteoarthritis). Antitumor activity (10/44 = 23% responses) was observed in study subjects who received treatment for >28 days (n = 44) including both partial (7) and minimal responses (3). Responses were disproportionately seen in dogs receiving ABT-898 formulations (9/28 = 32%) versus those receiving ABT-510 (1/16 = 6%; P < .045). Disease stabilization for >84 days was also documented (8/44 = 18%). Slow rates of tumor progression before study entry correlated with anti-tumor activity in treated dogs, whereas no significant association was found between changes in total CEC concentration and tumor response (P = .28) or time to progression (P = .42). CONCLUSIONS AND CLINICAL IMPORTANCE: Safely achieved antitumor activity was documented with TSP-1 MPs in dogs with STS. The most notable activity was achieved with the ABT-898 formulations.
Authors: Karen Batschinski; Alessandra Nobre; Ernesto Vargas-Mendez; Marcello V Tedardi; Juliana Cirillo; Greice Cestari; Rodrigo Ubukata; Maria Lucia Z Dagli Journal: Can Vet J Date: 2018-09 Impact factor: 1.008
Authors: Keri L Schadler; Erika J Crosby; Alice Yao Zhou; Dong Ha Bhang; Lior Braunstein; Kwan Hyuck Baek; Danielle Crawford; Alison Crawford; Jill Angelosanto; E John Wherry; Sandra Ryeom Journal: Cancer Res Date: 2014-03-03 Impact factor: 12.701
Authors: Sukhbir Kaur; Steven M Bronson; Dipasmita Pal-Nath; Thomas W Miller; David R Soto-Pantoja; David D Roberts Journal: Int J Mol Sci Date: 2021-04-27 Impact factor: 6.208
Authors: Xin Tong; Salida Mirzoeva; Dorina Veliceasa; Bryan B Bridgeman; Philip Fitchev; Mona L Cornwell; Susan E Crawford; Jill C Pelling; Olga V Volpert Journal: Oncotarget Date: 2014-11-30