You can find studies that refute their conclusion also, as I'm sure you know, if you looked through the literature. Here is an article (which cites some of those contradictory studies) that summarizes some of the problems associated with sunscreen use, and a quote from the article:
https://thetruthaboutcancer.com/causes-of-skin-cancer/
"A 2004 study in the medical journal
The Lancet showed indoor workers were twice as likely to get skin cancer as those who spent more time in the sun: “Paradoxically, outdoor workers have a decreased risk of melanoma compared with indoor workers, suggesting that chronic sunlight exposure can have a protective effect.”
Lack of sunlight means lack of vitamin D, which is a necessary nutrient for the body’s immune system to function properly.
Low vitamin D levels are linked to health problems, including cancer. Appropriate sun exposure helps maintain adequate levels of vitamin D. Using sunscreen interferes with that exposure and could be contributing to the rise in skin cancer."
Here is what is in many of the most popular sunscreens:
"Sunscreen often contains cancer-causing chemicals that bake into the skin and get absorbed into the bloodstream, over-taxing the liver with toxins. Here are some of the offenders:
- OMC – The main chemical used in sunscreens to filter out UVB is octyl methoxycinnamate (aka “OMC”) which has been shown to kill mouse cells even at low doses. Plus, it was also shown to be particularly toxic when exposed to the sun. And guess what? OMC is present in the vast majority of sunscreen brands!
- Titanium dioxide – another common ingredient in sunscreens, has been classified as “a potential occupational carcinogen” by the National Institute for Occupational Safety and Health.
- Oxybenzone – oxybenzone becomes carcinogenic when exposed to the sun and has been found to be a hormone disruptor! The Environmental Working Group (EWG) recommends consumers avoid oxybenzone, and yet it remains in many major brands of sunscreen.
- Derivatives of vitamin A such as retinol and retinyl palmitate – AOL News reported that about half the sunscreens tested in a study contained derivatives of vitamin A such as retinol and retinyl palmitate. These ingredients have been found to be photocarcinogenic by the FDA’s own studies, meaning the ingredients become toxic and cancer causing when exposed to sunlight.
- Diesopropyl adipate – in 2006, the National Toxicology Program reported that diesopropyl adipate, another ingredient in many sunscreens, increased the incidence of tumors in laboratory animals."
Personally, I have no desire to put this stuff on my skin.........I'll stick with my hat and lightweight long-sleeve shirt if I feel like I am getting too much sun.