STAT2 Promotes Tumor Growth in Colorectal Cancer Independent of Type I IFN Receptor Signaling
Bibliographic record
Abstract
The role of Signal Transducer and Activator of Transcription 2 (STAT2) in cancer remains poorly understood. STAT2 is a key mediator of type I interferon (IFN) signaling, activating the expression of IFN-stimulated genes with antiviral and antiproliferative effects. However, emerging evidence suggests that STAT2 can also promote tumor growth. Here, we show that high STAT2 mRNA expression in colon cancer tumors correlates with reduced overall survival in patients. In preclinical models, deletion of STAT2 in tumor cells suppressed tumor growth, whereas STAT2 overexpression enhanced tumor growth, supporting its pro-tumorigenic role. To determine whether this function depends on type I IFN receptor (IFNAR1) signaling, we generated IFNAR1 knockout (IFNAR1 KO) colon carcinoma cells and compared their growth with parental and STAT2-deficient (STAT2 KO) tumor cells. Loss of type I IFN signaling was confirmed by western blot and qPCR analyses. In vitro, IFNAR1 KO and STAT2 KO tumor cells proliferated at similar rates. However, in xenograft tumor transplantation models, IFNAR1 KO cells formed larger tumors while STAT2 KO tumor cells formed smaller ones compared to parental tumor cells. These findings indicate that STAT2 promotes colorectal cancer growth through mechanisms independent of IFNAR1 signaling.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
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 teacher head, 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".