1. Chen, a 53-year-old male with a small cell lung cancer mass in his right lung 5*3.5 cm, was implanted with 40 particles before treatment on May 4, and the lesion was rechecked on July 7 after implantation at 2*1.5 cm2. The left small cell lung cancer 4*5cm, 50 particles were implanted on June 2, and the lesion was significantly reduced on June 25, showing only high-density particle clusters.