William B. Coley started using a bacterial infection to treat cancers in the late 19th century, one of the earliest uses of immunotherapy.

Research:

• Ahuja, Sana and Sufian Zaheer. “The evolution of cancer immunotherapy: a comprehensive review of its history and current perspectives.” Korean Journal of Clinical Oncology 2024; 20(2): 51-73. DOI: https://doi.org/10.14216/kjco.24009
• Atkins, Douglas. “Helen Coley Nauts: Advocate for Immunotherapy.” National Library of Medicine. 4/19/2016. https://circulatingnow.nlm.nih.gov/2016/04/19/helen-coley-nauts-advocate-for-immunotherapy/
• Cancer Research Institute. “The History of Cancer Immunotherapy.”
• Coley, William B. “Therapeutic Value of the Mixed Toxins of the Streptococcus of Erysipelas and Bacillus Prodigiosus in the Treatment of Inoperable Malignant Tumors. With a Report of 160 Cases.” American Journal of the Medical Sciences. September 1896.
• College of Physicians of Philadelphia. “Cancer Vaccines and Immunotherapy.” History of Vaccines. https://historyofvaccines.org/vaccines-101/future-immunization/cancer-vaccines-and-immunotherapy/
• Colley, William B. “The Treatment of Inoperable Sarcoma by Bacterial Toxins (the Mixed Toxins of the Streptococcus erysipelas and the Bacillus prodigiosus).” Reprinted from the “ Proceedings of the Royal Society of Medicine,” November, 1909. London. John Bale, Sons & Danielsson, LTD. 1909. https://archive.org/details/b22425949/mode/1up
• Decker WK, da Silva RF, Sanabria MH, Angelo LS, Guimarães F, Burt BM, Kheradmand F and Paust S (2017) Cancer Immunotherapy: Historical Perspective of a Clinical Revolution and Emerging Preclinical Animal Models. Front. Immunol. 8:829. doi: 10.3389/fimmu.2017.00829
• Devaraja, K. et al. “Coley’s Toxin to First Approved Therapeutic Vaccine—A Brief Historical Account in the Progression of Immunobiology-Based Cancer Treatment.” Biomedicines 2024, 12, 2746. https://doi.org/10.3390/biomedicines12122746
• Dobosz, Paula and Tomasz Dzieciatkowski.” The Intriguing History of Cancer Immunotherapy. Frontiers in Immunology. 12/17/2019. doi: 10.3389/fimmu.2019.02965
• Hall, Stephen S. “A Commotion in the Blood: Life, Death, and the Immune System.” Henry Holt and Company. Excerpted at New York Times. https://archive.nytimes.com/www.nytimes.com/books/first/h/hall-commotion.html 
• Harutyunyan, Mariam. “How William Coley Became The Father of Cancer Immunotherapy.” OncoDaily Magazine. 7/31/2026. https://oncodaily.com/magazine/william-coley-549446
• Hiroaki Ikeda, Cancer immunotherapy in progress—an overview of the past 130 years, International Immunology, Volume 37, Issue 5, May 2025, Pages 253–260, https://doi.org/10.1093/intimm/dxaf002
• Journal of the American Medical Association. “Erysipelas Toxins in the Treatment of Malignant Tumors.” 10/27/1894.
• Journal of the American Medical Association. “The Failure of the Erysipelas Toxins.” Vol 23 Iss 24. 12/15/1894.
• Kokolus, Katie. “The History of Immunotherapy: Toxins, Targets & T Cells.” LabRoots. 10/18/2021. https://www.labroots.com/trending/cancer/21449/history-immunotherapy-toxins-targets-cells?srsltid=AfmBOooP1eoVP2LbWKR5m-HLu1PSBFhOyPH1jSJWWcxvyK6EA4-hBu47
• Levine, David B. “The Hospital for the Ruptured and Crippled: William Bradley Coley, third Surgeon-in-Chief 1925-1933.” HSS journal : the musculoskeletal journal of Hospital for Special Surgery vol. 4,1 (2008): 1-9. doi:10.1007/s11420-007-9063-2
• McCarthy, Edward F. “The Toxins of William B. Coley and the Treatment of Bone and Soft-tissue Sarcomas.” The Iowa Orthopaedic Journal. Vol. 26.
• Memorial Sloan Kettering Cancer Center. “MSK Immunotherapy — Timeline of Progress.” https://www.mskcc.org/timeline/immunotherapy-msk
• National Library of Medicine. “Harnessing the Power of You: The History of Immunotherapy.” https://www.nlm.nih.gov/exhibition/the-history-of-immunotherapy/index.html
• Nauts, Helen Coley. “Coley’s Toxins – The First Century.” Townsend Letter for Doctors and Patients. June 2004.
• Nawrat, Allie. “Charting the history of immunotherapy, cancer treatment’s fourth pillar.” Pharmaceutical Technology. 7/28/2020. https://www.pharmaceutical-technology.com/features/charting-the-history-of-immunotherapy-cancer-treatments-fourth-pillar/?cf-view&cf-closed
• Oiseth SJ, Aziz MS. “Cancer immunotherapy: a brief review of the history, possibilities, and challenges ahead.” J Cancer Metastasis Treat. 2017;3:250-61. http://dx.doi.org/10.20517/2394-4722.2017.41
• Tontonoz, Matthew. “What Ever Happened to Coley’s Toxins?.” Cancer Research Institute. 4/2/2015. https://www.cancerresearch.org/blog/what-ever-happened-to-coleys-toxins