Radiatia ultravioleta (UV) din lumina solara este responsabila de peste 90% din cancerele cutanate, incluzand melanoamele. Atat expunerea prelungita la soare cat si existenta unor arsuri solare in trecutul personal sunt recunoscute ca avant un rol in producerea cancerului de piele. Experienta de pana in prezent din Australia si alte tari arata ca este posibila educarea publicului cu privire la cresterea riscului de cancer prin expunerea prelungita la soare si la folosirea cremelor ecran, ceea ce duce la scaderea expunerii la UV.
Radiatia ionizanta este, indiscutabil, cancerigena, dar riscul de cancer consecutiv expunerii la niveluri reduse de radiatie este, in general, supraestimat. Chiar in randul japonezilor supravietuitori ai atacului cu bomba atomica, numai 1% au decedat din cauza cancerelor legate de radiatii.

Campurile magnetice
Campurile magnetice de frecventa foarte joasa au fost studiate foarte intens. Dovezile acumulate din studiile efectuate arata ca daca exista un risc, acesta este mic. Radiatia electromagnetica din spectrul undelor radio, folosita in telefonia mobila, constituie in prezent subiect de studiu pentru evaluarea posibilului efect cancerigen asupra creierului, dar in preznent nu exista nici o dovada care sa dea substanta acestei temeri.

Unele medicamente si proceduri medicale

Exista cateva produse si proceduri medicale care pot cauza cancer, dar atunci cand sunt administrate pacientilor care sufera de boli grave, beneficiile obtinute depasesc cu mult riscurile. Situatia este mai complicata atunci cand aceste proceduri si agenti farmacologici sunt aplicate persoanelor sanatoase in scopuri preventive, intrucat beneficiul potential este mai mic.

Radioterapia poate cauza cancer. Se poate

Radiotherapy can cause cancer. It is also conceivable that medical diagnostic radiation is responsible for some cancer cases, although this has been documented only for intrauterine exposures in relation to childhood leukemia. It is now generally recognized that mammography conveys a negligible risk but a substantial benefit.
Several pharmaceutical agents are human carcinogens (at different siteS): cancer chemotherapeutic and immunosuppressive drugs (bone marroW); menopausal estrogens (endometrium, possibly breasT); anabolic steroids (liveR); and phenacetin analgesics (kidney, pelviS). Other drugs with established carcinogenicity are not used anymore (e.g., DES).
Oral contraceptives, above and beyond their social benefits, prevent many more cancers of the ovary and endometrium than they cause in the liver, while their effect in causing breast cancer appears to be minimal.
Tamoxifen, a valuable drug for the treatment of breast cancer, is now being evaluated for the primary prevention of breast cancer among healthy women who are at high risk for the disease. There is considerable but not conclusive evidence, however, that tamoxifen can cause endometrial cancer.

Salt and other food additives and contaminants

As noted above, reduction of salt intake could reduce stomach cancer risk. No other food additive or contaminant has been linked conclusively to cancer.

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