This is because some lung cancer cells can secrete a human chorionic gonadotropin, the hormone can cause breast tissue, breast mast. 这是因为某些肺癌细胞能分泌出绒毛膜促性腺激素，这种激素可引起乳腺组织增生，使乳房肥大。
These stents slowly release a medication that preents the build-up of scar tissue, which can result in reclosing of arteries. 瘢痕组织增生能够导致动脉再闭合，而上述支架能够缓慢释放一种药物阻止瘢痕增生，进而达到预防动脉再闭合的目的。
