On November 15, 2018 TRACON Pharmaceuticals (NASDAQ:TCON), a clinical stage biopharmaceutical company focused on the development and commercialization of novel targeted therapeutics for cancer, wet age-related macular degeneration and fibrotic diseases, reported its new data from the Company’s ongoing Phase 3 TAPPAS study of TRC105 and Votrient (pazopanib) in patients with angiosarcoma at the Connective Tissue Oncology Society (CTOS) annual meeting, taking place in Rome, Italy (Press release, Tracon Pharmaceuticals, NOV 15, 2018, View Source [SID1234531358]).

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In a poster presentation entitled, "Detection of Endoglin-Expressing Circulating Tumor Cells in Patients Enrolled in An Adaptive Enrichment Phase 3 Trial of TRC105 And Pazopanib versus Pazopanib alone in Patients with Advanced AngioSarcoma (TAPPAS)," circulating tumor cell data were presented from patients enrolled into the TAPPAS Phase 3 trial. Endoglin expressing nucleated CTCs were detected using ApoStream technology (ApoCell, a Precision Medicine company).

Paired patient plasma samples taken at baseline and six weeks following treatment with either TRC105 and Votrient or single agent Votrient were analyzed in a blinded manner, without knowledge of treatment assignment. Endoglin+ CTCs decreased overall after 6 weeks of study treatment (baseline mean = 66/ml; median = 1.38/ml; range 0 – 1172/ml versus 6 week mean = 1.30/ml; median = 1.38/ml; range 0 – 185/ml). Three key findings emerged in the blinded analysis:

18 of 51 patients (35%) had a greater than two-fold reduction in endoglin+ CTCs, including 13/51 patients (25%) with a greater than 10-fold reduction.
19 of 51 patients (37%) had a greater than two-fold increase in endoglin+ CTCs, including 13/51 patients (25%) with a greater than 10-fold increase.
14 of 51 patients (27%) had no significant change in endoglin+ CTCs, all but one of whom had fewer than four endoglin+ CTCs per mL detected at baseline.
"The CTC analysis done as part of the TAPPAS Phase 3 trial has been robust and we have seen differences in CTC count following treatment which will be unblinded and correlated with treatment arm in the final analysis. Change in CTC count on study may be useful as a prognostic biomarker, and baseline CTC count may be useful as a predictive biomarker," said Charles Theuer, M.D., Ph.D., President and CEO of TRACON. "In the meantime, we look forward to the Phase 3 TAPPAS trial interim analysis expected in the first quarter of 2019."

The poster is available on TRACON’s website at www.traconpharma.com

About Carotuximab (TRC105)

TRC105 is a novel, clinical stage antibody to endoglin, a protein overexpressed on proliferating endothelial cells that is essential for angiogenesis, the process of new blood vessel formation. TRC105 is currently being studied in a pivotal Phase 3 trial in angiosarcoma and multiple Phase 2 clinical trials, in combination with VEGF inhibitors, as well as in a Phase 1 trial with Opdivo. TRC105 has received orphan designation for the treatment of soft tissue sarcoma in both the U.S. and EU. The ophthalmic formulation of TRC105, DE-122, is currently in a randomized Phase 2 trial for patients with wet AMD. For more information about the clinical trials, please visit TRACON’s website at www.traconpharma.com/clinical_trials.php.