A股收评：三大指数小幅下跌，培育钻石板块回撤，免疫治疗概念逆市爆发

Market Overview - The three major A-share indices experienced a decline in early trading, with the Shanghai Composite Index closing down 0.07% at 4000 points, the Shenzhen Component Index down 0.36%, and the ChiNext Index down 0.39% [1] - The total market turnover was 1.96 trillion yuan, a decrease of 49.1 billion yuan compared to the previous trading day, with over 3500 stocks declining [1] Sector Performance - The cultivated diamond sector saw a significant pullback, with World falling over 11% [1] - The photovoltaic equipment sector also declined, with Aters falling over 14% [1] - The controllable nuclear fusion sector dropped, with Hailu Heavy Industry hitting the daily limit down [1] - The superconducting concept weakened, with Guolan Testing leading the decline [1] - Other sectors with notable declines included BC batteries, non-metallic materials, virtual power plants, and power equipment [1] Gaining Sectors - The immunotherapy concept surged, with multiple stocks such as Zhongyuan Qihua and Kaineng Health hitting the daily limit up [1] - Oil and gas stocks rallied, with PetroChina hitting the daily limit up [1] - The brain-computer interface sector was active, with Taihe Technology rising over 8% [1] - Other sectors with notable gains included pharmaceutical commerce, insurance, recombinant proteins, and medical devices [1] Index Performance - Shanghai Composite Index: 4000.14, down 2.62 points (-0.07%) [1] - Shenzhen Component Index: 13240.62, down 48.39 points (-0.36%) [1] - ChiNext Index: 3122.03, down 12.29 points (-0.39%) [1] - Other indices such as the CSI 300 and CSI 500 also showed declines [1]