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Trillium Update
http://finance.yahoo.com/news/trillium-therapeutics-presents-tti-621-110000987.html

TORONTO, ONTARIO--(Marketwired - Apr 3, 2017) - Trillium Therapeutics Inc. (TRIL) (TRIL) a clinical stage immuno-oncology company developing innovative therapies for the treatment of cancer, today provided the following preclinical and clinical updates on its TTI-621 program.

AACR presentations:

Today the company presents two preclinical posters at the 110th American Association for Cancer Research Annual Meeting in Washington, DC:

The first presentation (Abstract #2646), entitled "Intratumoral Delivery of TTI-621 (SIRPaFc), a CD47-Blocking Immunotherapeutic, Inhibits Tumor Growth and Prolongs Animal Survival in a Subcutaneous B Cell Lymphoma Model," demonstrated that TTI-621 was efficacious when injected directly into tumors in a xenograft model. In addition, intratumoral TTI-621 increased the phagocytosis of tumor cells by both M1 and M2 tumor-associated macrophages. These data support the clinical evaluation of direct tumor injections of TTI-621. A Phase 1 study of intratumorally delivered TTI-621 in patients with percutaneously accessible solid tumors and mycosis fungoides is ongoing (NCT02890368).

The second presentation (Abstract #2653), entitled "The Anti-Myeloma Activity of TTI-621 (SIRPaFc), a CD47-Blocking Immunotherapeutic, is Enhanced When Combined With a Proteasome Inhibitor," showed that TTI-621 exhibits anti-myeloma activity on its own that is further enhanced by combination with FDA-approved proteasome inhibitors, such as bortezomib and carfilzomib. These data provide a rationale to evaluate a combination cohort of TTI-621 and a proteasome inhibitor in multiple myeloma patients.

Clinical update:

The company is currently enrolling patients in the expansion phase of its ongoing Phase 1 trial of TTI-621, in patients with multiple hematologic malignancies (NCT02663518). Trillium is providing this clinical update in conjunction with the AACR presentations.

To date, 33 evaluable patients have been enrolled into the expansion phase of the trial, with several patients demonstrating preliminary evidence of anti-tumor activity. In the AML cohort, one patient with minimal residual disease (consisting of 0.7% abnormal blasts at baseline) obtained a complete molecular remission after 4 infusions of TTI-621. A second marrow analysis at week 8 confirmed a complete molecular remission, the patient continues to tolerate weekly infusions of TTI-621 and remains in continued remission for 15+ weeks.

In the TTI-621/rituximab combination cohort, 3 of 6 patients who have had at least one interval PET/CT restaging obtained partial metabolic responses, as demonstrated by decreased tumor activity on PET/CT scans. These patients with CD20-positive, B-cell lymphoma received weekly IV infusions of TTI-621 and rituximab. Manageable infusion reactions occurred in most patients after the first infusion of TTI-621 and the combination therapy has been associated with acceptable outpatient tolerability. These responding patients remain on treatment and progression-free for 19+ (DLBCL), 18+ (transformed lymphoma), and 8+ weeks (follicular lymphoma) in continuing follow-up.

"Patients with treatment-refractory lymphoma and acute myeloid leukemia continue to represent a pronounced unmet clinical need," said Trillium's Chief Medical Officer, Eric Sievers, MD. "We and the clinical investigators are encouraged that several of the patients treated with the TTI-621/rituximab combination obtained robust lymphoma regressions. Moreover, while anecdotal, the achievement of complete molecular remission in a patient with relapsed AML is intriguing. Taken together, we believe that the multiple clinical responses observed across varied hematologic malignancies to date is promising."

Details of these clinical responses with further follow-up will be reported at scientific symposia later this year.