下列情况符合小叶原位癌的特点的是（）
A.需清扫腋窝淋巴结
B.需进行手术，加用放疗
C.起源于末梢导管和腺泡，未突破基底膜
D.很快发展为浸润癌
E.常发生于中老年妇女
参考答案：C
解析：小叶原位癌起源于终末导管一小叶单元，癌细胞局限于管泡内，未突破基底膜，未发生浸润，不需广泛切除及腋窝淋巴结清扫，也不需放疗。小叶原位癌在诊断时30%为双侧性，本病多见于青年妇女。小叶原位癌发展慢，预后好，从确定诊断到发生浸润，可间隔25年之久，不易发展为浸润癌。
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| Most students want to study well. But what is the best way to study? This is a very important question. Different people study in different ways. Some Chinese students often 1 very hard 2 long hours. This is a 3 habit, but it is not a better way to study. A good student must 4 enough sleep, enough food and enough rest. Every 5 you 6 to take a walk or play basketball or ping-pong or sing a song. When you 7 to your studies, you'll find yourself 8 than before and you'll learn more. Perhaps we can 9 that learning English is like taking Chinese medicine, we mean that like Chinese medicine, the effects of your study 10 slowly but surely. Learn every day, and effects will come just like Chinese medicine. Keep on trying hard till you are successful. | |||
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