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Do Sharks Get Cancer?

Source Wikipedia

There is a widespread, persistent myth that sharks are immune to cancer, largely popularized by a 1992 book titled Sharks Don’t Get Cancer by Dr William Lane. However, marine biologists and veterinary pathologists have definitively proven that sharks do develop both benign and malignant tumors.

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Posted byDavid McGuireMay 18, 2026May 18, 2026Tags: blue shark, cartilage, great white shark, Hammerhead Shark, news'cancer, spiny dogfish, squalene, treatment, tumors

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  • About
    • Mission and Vision
    • Our Goals and How We Get There
    • Where We Work
      • Saving the Scalloped Hammerheads of Baja
      • California Marine Protection
      • Sharks of Hawaii
        • Hawai’i Kahu Manō- Guardians of the Shark
        • Respect for Hawaii Fish- Aquarium Collection
        • ‘Auamakua, Hawaii’s Spiritual Connection to the Shark
      • Sharks in the Coral Triangle
    • Our Team
      • Media Kit, David McGuire, Shark Stewards
    • Partners & Donors
    • Victories & Milestones
      • Act Now to Defend the Endangered Species Act
      • WE DID IT! Saving Endangered Sharks at CITES 2022
      • US Shark Fin Sales Elimination Act Signed into Law
      • Law to End Lethal California Driftnet Fishery Passes
      • Support the Papahānaumokuākea National Marine Sanctuary Designation
    • Shark Stewards DEI Statement
    • Statement Against Asian and API Hate
  • Our Work
    • Saving Sharks
    • California Marine Protected Area Network
      • Shark Sanctuary and MPAs
    • Sharktober Sanctuary Wildlife Expeditions
      • Sharktober: Farallon Sanctuary and Wildlife Tours
      • Sharktober Sanctuary Tours- Instructions
    • Aquatic Park Stewardship
    • White Shark Stewardship
      • How to Avoid a White Shark Attack
      • Sharktober- White Shark Awareness
    • Shark Watch California
      • Observe and Record Sevengill Sharks
        • Sharks of the San Francisco Bay
        • Shark ID and MPAs Education Adventure
    • Stop the Ocean Steal
    • Community Science
      • Citizen Science
    • Shark Science Sheets
      • CITES Shark Science Sheets
    • Media Production
    • Inland Ocean Academy
  • Campaigns
    • Protect the Papahānaumokuākea and Pacific Marine National Monuments From Commercial Fishing
    • SHARKED Act in Senate Committee- Act Now
    • Save the Endangered Species Act
    • Urgent Action to Save Oceanic Whitetip Sharks
    • Stop Big Plastic From Polluting Oceans
  • Get Involved
    • Contact Us
    • Shark Buddies- Connect and Protect
    • Adventures
    • Help Us Save Sharks
    • Beach Cleanups and Surveys
    • Events
  • Shark News
  • Shop

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Shark Stewards is a project of The Earth Island Institute, an environmentalist think tank founded by David Brower in 1983 and a 501(c)(3) non-profit.

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