April 16: Immunotherapy: A Game-Changer for Cancer Patients

The “Holy Grails" of cancer therapy are specificity and potency. Immunotherapy provides both but it has only been in the past 10–20 years that these potentials have been realized. This presentation began with an overview of the immune system and, with this foundation, explained how the immune system has been deployed to treat cancer and speculations on what the future holds.

Presented by: Christopher Pennell, Professor in the Department of Laboratory Medicine and Pathology and a researcher in the Masonic Cancer Center at the University of Minnesota. He currently co-directs the Institute for Engineering in Medicine's Inspire Program and the Cancer Center's M-ASCEND Program.

Part of the OLLI At-the-U Lecture Series.

Key Takeaways

  1. The Nature of Cancer as "Rogue Cells"
    • Definition: Cancer is an umbrella term for hundreds of diseases where one of the body's trillions of cells "goes rogue" by ignoring normal biological rules.
    • The Rules Broken: Healthy cells are supposed to divide only when told, stay in their proper location, perform their specific job, and die when instructed. Cancer cells fail in all these areas, leading to uncontrolled growth (tumors) and invasion of other tissues (metastasis).
    • Mechanisms of Harm: Cancer cells outcompete healthy cells for nutrients and oxygen, physically squeeze organs to compromise their function, and can secrete problematic excess proteins.
  2. How Cancer Arises: The "Numbers Game"
    • Genetic Mistakes: Every day, the human body copies a "trillion billion" letters of DNA to create roughly 300 billion new cells.
    • Causes: Mutations (errors in DNA) typically accumulate through three avenues:
      • Age: Long-term accumulation of mistakes over decades.
      • Bad Luck: Inherited mutations or accidental environmental exposures (e.g., radiation).
      • Lifestyle: Choices within our control, such as cigarette smoking or sun exposure.
  3. The Role of the Immune System
    • Immune Surveillance: The immune system naturally acts to maintain balance (homeostasis) and constantly identifies and destroys nascent tumor cells before they become clinically apparent.
    • The "Wall": Clinically detectable tumors are those that have successfully "erected a wall" to evade immune recognition. Immunotherapy aims to understand this wall's "bricks and mortar" to destroy its integrity or allow immune cells to crash over it.
  4. Why Immunotherapy is a "Game Changer"
    Dr. Pennell identifies four critical characteristics that make immunotherapy superior to traditional treatments like surgery or chemotherapy:
    • Exquisite Specificity: It can distinguish between two proteins that differ by only a single amino acid.
    • Potency: It can mount an incredibly powerful attack against malignant cells.
    • Memory: If the cancer returns, the immune system can remember and eliminate it again.
    • Adaptability: It can hit "moving targets" as cancers mutate over time.
  5. Success Story: CAR T Cell Therapy
    • Case Study: The lecture highlights Emily Whitehead, the first pediatric patient treated with CAR T cell therapy.
    • Process: Doctors removed her T cells, "trained" them in a lab (reprogramming them to recognize cancer), and re-infused them into her blood.
    • Outcome: Despite being given only weeks to live after relapsing, the therapy put her into a remission that has lasted over 14 years.

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