当代生物学中最引人注意的领域之一是肿瘤与宿主的相互关系问题,包括肿瘤的自发性排斥。在角化棘皮瘤(Keratoacanthoma,KA),即可见到这种现象。人体自然发生的KA 有单发性和多发性两类,前者并不少见。后者则属罕有,迄今已报导的仅约80例。多发性 KA 有两类,即 Ferguson-Smith 型和 One of the most interesting areas in contemporary biology is the relationship between tumor and host, including the spontaneous rejection of tumors. This phenomenon can be seen in Keratoacanthoma (KA). Naturally occurring KA in the human body has two types, single and multiple, and the former is not uncommon. The latter is rare and only about 80 cases have been reported so far. There are two types of multiple KA, Ferguson-Smith type and