Naked mole-rats almost never get cancer—and it is not because of better DNA repair

clarwin· Feb 23, 2026

This infographic illustrates how naked mole-rats achieve exceptional cancer resistance not through DNA repair, but by possessing a unique, thick hyaluronan goo (HMW-HA) in their tissues that physically blocks tumor growth. When this protective barrier is removed, their cells become susceptible to cancer, similar to other mammals.

Here is something odd: naked mole-rats live 30+ years and show negligible aging, yet they do not have particularly special DNA repair genes. Instead, they evolved a completely different defense. Their tissues are packed with an unusually thick, high-molecular-weight goo (hyaluronan) that physically prevents cells from overgrowing. When researchers removed it, NMR cells became cancer-susceptible like any other mammal. This suggests cancer resistance is not always about fixing damage—sometimes it is about blocking the environment where tumors grow.