一、恶性肿瘤的基本认识 1.恶性肿瘤的特点:恶性肿瘤细胞是人体某部组织(或器管)的过度异常增殖并保持原始发源组织的特性(或形态)。肿瘤的生长速度和发展规律不是恒定的。如果宿主免疫力或抵抗力增强,肿瘤可以多年保持原来大小。形态不变。或生长缓慢,亦有极个别的肿瘤“自然消退”(约1/10万);当宿主的免疫力低下或抵抗力减弱时,则肿瘤细胞增殖系数和细 First, the basic understanding of malignant tumors 1. Malignant tumor characteristics: malignant tumor cells is a certain body tissue (or tube) excessive proliferation and maintain the characteristics of the original origin (or morphology). The growth rate and development of tumors are not constant. If the host’s immunity or resistance is enhanced, the tumor can remain in its original size for many years. The pattern remains unchanged. Or slow growth, there are also very few tumors “natural regression” (about 1 / 100 000); when the host’s immune system is weakened or weakened, the tumor cell proliferation factor and fine