Malignant melanomas are more frequently fatal, but they are rare (representing 4 percent of skin cancer diagnoses) and tend to strike only light-skinned people.

 
  • 但是皮肤癌通常很晚发作,大部分病人都是进入生殖期后才得的,因此皮肤癌不可能造成足够的演化压力。
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