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medicalJapan·2025 (case treated and resected; reported March 2026)·5 min read

Stage IV Colon Cancer Vanishes After a Rheumatoid-Arthritis Drug Is Stopped

A 79-year-old woman with biopsy-confirmed Stage IVA transverse colon cancer and synchronous liver metastasis showed complete disappearance of viable tumor at both sites after her rheumatoid-arthritis drug tocilizumab (an anti-IL-6 receptor antibody) was discontinued; surgery found only fibrosis and scar tissue. Reported in Surgical Case Reports (2026).

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A 79-year-old woman with biopsy-confirmed Stage IVA transverse colon cancer and synchronous liver metastasis showed complete disappearance of viable tumor at both sites after her rheumatoid-arthritis drug tocilizumab (an anti-IL-6 receptor antibody) was discontinued; surgery found only fibrosis and scar tissue. Reported in Surgical Case Reports (2026).

A fuller write-up of the documentation and analysis is in progress.

#spontaneous regression#cancer#colorectal cancer#liver metastasis#tocilizumab#IL-6#immunology#case report

Sources

Tagged by proximity to the event. Primary sources are direct or contemporaneous; tertiary are downstream retellings.

  1. 1.
    Primaryacademic

    Eiki Miyake et al., "Spontaneous Regression of Metastatic Colorectal Cancer Following Discontinuation of an Interleukin-6 Receptor Inhibitor: A Case Report", Surgical Case Reports (PMC full text), 2026

    Full text of the case report. Source for patient age/sex, Stage IVA (cT2N1aM1a) diagnosis, pre-treatment biopsy confirmation of both sites, tocilizumab 480 mg for rheumatoid arthritis, surgical procedures, no-viable-tumor pathology, and the authors' IL-6-withdrawal immune-rebound hypothesis.

  2. 2.
    Primaryacademic

    Eiki Miyake, Fumitaka Taniguchi, Mikoto Nosaka, et al., "Spontaneous Regression of Metastatic Colorectal Cancer Following Discontinuation of an Interleukin-6 Receptor Inhibitor: A Case Report", Surgical Case Reports / J-STAGE (official journal platform), 2026

    Official journal landing page reached via DOI 10.70352/scrj.cr.25-0710. Confirms exact title, full author list, journal, and Vol 12, Issue 1 (2026).

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