以前科学家们不能确认癌症是否直接起源于干细胞，或子代细胞是否是肿瘤发生的根源。
Previously scientists could not be sure if the cancer causing faults occurred directly to stem cells, or whether 'daughter' cells were the route cause of the tumour.
结论：黑色素细胞肿瘤切除后瘢痕中黑色素沉着的皮肤镜诊断可为判断色素沉着的起源提供有用的信息。
CONCLUSIONS: Dermoscopic examination of melanotic pigmentations in excision scars of melanocytic tumours provides useful information about the origin of that pigmentation.
最常见的的原发恶性肿瘤是鳞状细胞癌，其次是起源于唾液腺的腺样囊腺癌。
The most common primary malignant tumor is squamous cell carcinoma, with the second most common being adenoid cystic carcinoma arising from the salivary glands.
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