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Skin cancer is the leading type of cancer in the United States. While many sunscreens can prevent UV-B radiation, which is associated with basal and squamous cell carcinoma, they often do not provide sufficient protection against UV-A radiation, which can lead to malignant melanoma, a more severe form of skin cancer. Zinc oxide-based compounds have proven effective in blocking UV-A radiation and reducing the risk of malignant melanoma. A dermatologist is currently working on a new sunscreen formulation that incorporates zinc oxide to provide protection against both UV-A and UV-B radiation. In her experiment, she divided the subjects into two groups: one group applied her novel sunscreen, while the other group used a standard sunscreen daily for four and a half years. After the study, she observed that 2% of the subjects using her novel sunscreen developed malignant melanoma, compared to 8% in the group using the standard sunscreen.

Question for Practice Passage Test - 5
Try yourself:What is the most common cause of cancer in the United States?
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Question for Practice Passage Test - 5
Try yourself:Which type of radiation has been linked to basal and squamous cell carcinoma?
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Question for Practice Passage Test - 5
Try yourself:What is the severe form of skin cancer caused by UV-A radiation?
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Question for Practice Passage Test - 5
Try yourself:What has shown efficacy in repelling UV-A radiation and reducing the risk of malignant melanoma?
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Question for Practice Passage Test - 5
Try yourself:What was the occurrence of malignant melanoma in subjects applying the standard sunscreen?
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