A phase 1 dose-escalation trial of intratumoral TTI-621, a novel immune checkpoint inhibitor targeting CD47, in subjects with relapsed or refractory percutaneously-accessible solid tumors and mycosis fungoides.
Bibliographic record
Abstract
TPS3101 Background: CD47 is an immune checkpoint that binds to signal regulatory protein alpha (SIRPα) and delivers a "do not eat" signal to suppress macrophage phagocytosis. Tumor cells frequently overexpress CD47 and exploit this pathway to evade macrophage-mediated destruction. CD47 blockade promotes both innate (macrophage phagocytosis) and adaptive immunity (T cell responses). TTI-621 (SIRPαFc) is an immune checkpoint inhibitor designed to bind human CD47 and block the “do not eat” signal. The IgG1 region of TTI-621 engages Fcγ receptors on macrophages, converting the inhibitory signal to one that activates, thereby enhancing phagocytosis, and antitumor activity. A Phase 1 study is ongoing to evaluate the safety/tolerability and preliminary efficacy of IV administered TTI-621 in subjects with relapsed/refractory hematologic malignancies. It is hypothesized that employing direct intratumoral injections will result in very high local target engagement, promoting the development of innate and adaptive immune responses. Methods: A Phase 1 multicenter, open-label study was initiated to characterize the safety and tolerability of delivering TTI-621 directly into cancer lesions to achieve high local CD47 engagement to increase phagocytosis of tumor cells (NCT02890368). Subjects are being enrolled in sequential cohorts that gradually increase in dose and dosing frequency to characterize the feasibility of intratumoral TTI-621 injections and their safety, PK, pharmacodynamics, and preliminary antitumor activity. Eligible subjects are adults with relapsed or refractory percutaneously-accessible solid tumors or mycosis fungoides (MF), which have progressed on standard anticancer therapy or for which no other approved therapy exists. TTI-621 is delivered by intratumoral injection at protocol-defined doses and dosing regimens starting at 1 mg/injection. Serial biopsies are being collected to characterize local anti-tumor responses and assess the impact of TTI-621 on the tumor microenvironment. Clinical trial information: NCT02890368.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.002 | 0.003 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".