{
  "$schema": "https://themachinepress.com/schemas/story-v1.schema.json",
  "schema_version": "1.0.0",
  "document_type": "machine_press_story",
  "story": {
    "story_id": "mp-2026-07-25-004",
    "source_story_id": "tmp-story-bacteria-pancreatic-cancer",
    "edition_id": "mp-2026-07-25-morning-0016",
    "edition_url": "https://themachinepress.com/edition/2026-07-25",
    "position": 4,
    "story_type": "dispatch",
    "section": "research",
    "editorial_classification": "editorial",
    "headline": "Engineered Bacteria Carry an Immune Signal Into Tumors",
    "slug": "engineered-bacteria-carry-an-immune-signal-into-tumors",
    "dek": "A modified Bifidobacterium delivered an altered IL-2 payload to oxygen-poor pancreatic tumors in animal models.",
    "summary": "A modified Bifidobacterium delivered an altered IL-2 payload to oxygen-poor pancreatic tumors in animal models.",
    "body_text": "University of Chicago researchers engineered Bifidobacterium longum to accumulate in hypoxic tumors and release a modified interleukin-2 payload. In mouse models of pancreatic cancer, the system activated tumor-fighting CD8 T cells and improved responses when combined with chemotherapy, radiation, or anti-PD-L1 treatment. The work has not been tested in people, and safety and control of a living therapy remain open questions.",
    "why_it_matters": "A modified Bifidobacterium delivered an altered IL-2 payload to oxygen-poor pancreatic tumors in animal models.",
    "limitations": [
      "The work has not been tested in people, and safety and control of a living therapy remain open questions."
    ],
    "importance": 9,
    "canonical_url": "https://themachinepress.com/story/mp-2026-07-25-004/engineered-bacteria-carry-an-immune-signal-into-tumors",
    "json_url": "https://themachinepress.com/story/mp-2026-07-25-004.json",
    "first_published_at": "2026-07-25T09:00:00.000-04:00",
    "modified_at": "2026-07-25T09:00:00.000-04:00",
    "content_status": "new",
    "is_carryover": false,
    "carryover_reason": null,
    "key_claims": [
      {
        "claim_id": "claim-mp-2026-07-25-004-001",
        "text": "A modified Bifidobacterium delivered an altered IL-2 payload to oxygen-poor pancreatic tumors in animal models.",
        "source_ids": [
          "source-2026-07-25-004"
        ],
        "qualification": "The work has not been tested in people, and safety and control of a living therapy remain open questions."
      }
    ],
    "source_ids": [
      "source-2026-07-25-004"
    ],
    "tags": [
      "pancreatic cancer",
      "engineered bacteria",
      "immunotherapy"
    ],
    "image_url": null,
    "corrections": []
  },
  "sources": [
    {
      "source_id": "source-2026-07-25-004",
      "title": "University of Chicago via EurekAlert: BifidoSumIL-2",
      "publisher": "University of Chicago via EurekAlert",
      "url": "https://www.eurekalert.org/news-releases/1137531",
      "canonical_url": "https://www.eurekalert.org/news-releases/1137531",
      "source_type": "official_announcement",
      "is_primary_source": true,
      "published_at": null,
      "accessed_at": "2026-07-25T08:26:47.000-04:00",
      "supports_claim_ids": [
        "claim-mp-2026-07-25-004-001"
      ]
    }
  ],
  "corrections": [],
  "publisher": {
    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
  },
  "cite_this_report": {
    "title": "Engineered Bacteria Carry an Immune Signal Into Tumors",
    "publisher": "The Machine Press",
    "published_at": "2026-07-25T09:00:00.000-04:00",
    "canonical_url": "https://themachinepress.com/story/mp-2026-07-25-004/engineered-bacteria-carry-an-immune-signal-into-tumors"
  }
}