The incidence of skin cancer is very low in China, but it is one of the most common malignant tumors in the white race. According to the Sha
The incidence of skin cancer is very low in China, but it is one of the most common malignant tumors in the white race. According to the Shanghai Cancer Institute in 1988, the incidence of malignant tumors in Shanghai city statistics show that, in addition to the incidence of malignant melanoma outside the skin cancer incidence rate of 1.53/10 million. Boring et al. Reported that in 1991 there were 600 thousand new cases of skin cancer other than malignant melanoma in the United states. According to Giles reports, the incidence of skin cancer in southern Australia at least 650/10 million, 100 times the incidence of china. It has been estimated that about 40% to 50% people in the United States, who are able to live to the age of 65, have at least had skin cancer, which may be related to the geographical location and lifestyle of the people.
1 squamous cell carcinoma is often keratosis, leukoplakia and other precancerous diseases and transformed into. Rapid growth, early formation of ulcers. Some nodular or cauliflower, to the depth of the invasion of small, mobile base; some were butterfly, to the depth of infiltration is obvious, often involving the bone destruction. Squamous cell carcinoma is often associated with purulent infection with odor and pain. Regional lymph node metastasis was more common in patients with squamous cell carcinoma of the head of the head, which was characterized by extremely foul odor, purulent secretion, and hemorrhage. The incidence of squamous cell carcinoma at the junction of mucosa and skin is the fastest, and the mucosal disease is more easily transferred.
2 basal cell carcinoma onset is often asymptomatic, early stage for the basal hard plaque papules, some were verrucous uplift, and then break for irregular change, ulcer, with the bottom edge of the uplift, pass, uneven, slow growth. The transfer of very few, the first occurrence of the edge of the translucent nodules in shallow ulcers in the shallow, followed by the gradual expansion of the surrounding tissues and organs can be eroded, become invasive ulcers.
3 squamous cell carcinoma in the age of 30 to more than 50 years old, more than 50 years old with basal cell carcinoma. The former is rapid and often grows rapidly in the short term. Squamous cell carcinoma occurs in the lower lip, tongue, nose, vulva, prone to skin and mucosa at the junction point, ulcer edge high, hard red, a ring, cauliflower appearance, peripheral inflammatory reaction significantly, many regional lymphadenopathy. Basal cell carcinoma occurs in the eyes, nose, cheeks, canthus, forehead and back of the hand; the ulcer margin is waxy, nodular, rolled up, some black, slight inflammatory reaction or no metastasis, rarely, mainly to the deep tissues. One
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