Scientists have discovered how naturally occurring but unstable molecules, known as free radicals, can control the fundamental process of cell division, which, when it goes wrong, can lead to uncontrolled cell growth and cancer.

no no no thats not what causes cancer!
There is a specific specific event down to the electron that causes cancer in every type.its the same event my friend..
correlation is not causation.

https://www.icr.ac.uk/news...

Ionization is the process by which ions are formed by gain or loss of an electron from an atom or molecule. If an atom or molecule gains an electron, it becomes negatively charged (an anion), and if it loses an electron, it becomes positively charged (a cation). Energy may be lost or gained in the formation of an ion.

Ions are atoms (or groups of atoms) which carry an electric charge because they have either gained or lost one or more electrons. If an atom gains electrons it acquires a negative charge. If it loses electrons, it becomes positively charged.

electron, lightest stable subatomic particle known. It carries a negative charge of 1.602176634 × 10−19 coulomb, which is considered the basic unit of electric charge.

Navy researchers have developed a nanoparticle-based electron donor-acceptor bioconjugate for the real-time perception of changes in cellular membrane potential. It consists of a photoluminescent nanoparticle electron donor, a multidomain membrane insertion peptide, and an electron acceptor. The rate of electron transfer between the donor and acceptor is modulated by changes in membrane potential, which lead to measurable alterations in donor photoluminescence. In one specific case of the donor-acceptor bioconjugate, the electron donor is a semiconductor quantum dot that is connected to fullerene, the electron acceptor, through a membrane-insertion peptide.

The interactive effects between electron donor substances and iron (Fe) oxides have significant influence on electron transfer and the growth of Fe-reducing bacteria, which may affect the reductive dechlorination of 1,1,1-trichoro-2,2-bis(p-chlorophenyl)ethane (DDT) in soils.

The surfaces of iron oxide nanoparticles are capable of catalytically generating reactive oxygen species (ROS) through the Fenton and Haber-Weiss reactions.