Atavistic Theory of Cancer

In 2011, physicist Paul Davies and astrobiologist Charlie Lineweaver argued that cancer isn’t just cells accumulating random mutations. Instead, cancer cells switch back on ancient genetic programs that helped single-celled organisms survive billions of years ago.

Core mechanism

Cancer happens when cells lose the regulatory controls that make multicellular life work, and fall back to ancestral single-cell behaviors:

• Uncontrolled proliferation
• Metabolic flexibility
• Resistance to cell death signals
• Ability to migrate and invade tissues
• Independence from growth signals

These capabilities aren’t newly acquired through mutations - they’re ancient genetic programs that multicellular organisms normally keep turned off.

Serial atavism model

Davies and Lineweaver later refined this into the