Making Sense with Sam Harris
Making Sense with Sam Harris

#485 — The New Science of Cancer

July 14, 2026

AI Summary

5 min read

The New Science of Cancer

In 2020, the United States imported about $5 billion worth of drugs from China. By 2025, that number is expected to reach $60 to $70 billion. This is one of many surprising facts that oncologist Siddhartha Mukherjee shares in a wide-ranging conversation about how our understanding of cancer has evolved since his Pulitzer Prize-winning book The Emperor of All Maladies was first published fifteen years ago.

The Conceptual Framework: One Disease or Many?

Every individual cancer specimen is its own disease in the genetic sense. Two women with breast cancer may have completely different spectra of mutations driving their cancer cells to grow. Yet they share a common physiological problem: the cells don't know how to stop dividing, and they have hijacked normal pathways that healthy cells use to survive. The fundamental challenge in treatment has always been finding pathways that are sufficiently different between cancer cells and normal cells to serve as therapeutic targets. As Mukherjee puts it, the big unlock is "can we find one pathway, two pathways, five pathways, ten pathways that are different enough between a cancer cell and a normal cell."

Prevention: The Hardest Science

Continue reading the full summary in the app — free to try.

Read Full Summary →

Free • No credit card required

Listen to Audio Summary Open in App

What you'll learn

  • 1 (00:21) **Introduction and Reframing Cancer** - Sam Harris introduces Siddhartha Mukherjee and the updated edition of *The Emperor of All Maladies*, setting up a discussion on prevention, detection, and treatment.
  • 2 (05:13) **Why Prevention Science Is So Difficult** - Mukherjee explains why cancer prevention research lags behind treatment, despite being the logical priority.
  • 3 (08:13) **Three Methods for Identifying Carcinogens** - The conversation covers the classical ways scientists find cancer-causing agents.
  • 4 (12:06) **The "Inflammagen" Revolution in Prevention** - A major new idea: chemical carcinogens that work by changing the cellular environment, not by causing mutations.
  • 5 (18:08) **Anti-Inflammatory Drugs and Chemoprevention** - Mukherjee clarifies what kind of inflammation matters and gives a concrete example of existing chemoprevention.
  • 6 (20:13) **Navigating Personal Cancer Risk Without Panic** - Practical advice for people who know they have elevated genetic or familial risk.
  • 7 (27:44) **Liquid Biopsies and the Problem of False Positives** - Sam shares his personal experience with a false-positive cell-free DNA test, leading to a discussion of Bayesian statistics.

+ Full timestamped outline available in the app

Show Notes

Sam Harris speaks with Siddhartha Mukherjee about the science of cancer. They discuss the updated edition of The Emperor of All Maladies, whether cancer is one disease or many, why prevention is so hard, inflammation and air pollution as carcinogens, the myth that cell phones cause cancer, liquid biopsies and Bayesian reasoning, immunotherapy and CAR T cells, drug pricing, the promise of AI in drug discovery, the state of American medical science, and other topics.

If the Making Sense podcast logo in your player is BLACK, you can SUBSCRIBE to gain access to all full-length episodes at samharris.org/subscribe.

Making Sense with Sam Harris

More from this podcast

Making Sense with Sam Harris →