小细胞肺癌包括燕麦细胞癌占全部肺癌的16～18%。一经确诊之后,其自然中位生存期少于3月。单凭手术切除或放射治疗所得五年生存率均仅1%或更低。严格选择病情局限于胸内之病例放疗后五年生存率亦不及10%,手术较此更低。因本病早期即多发生胸外播散,每非现有临床化验各种方法所能检出。而骨髓活检阳性率相当高(24～47%)。因此,近年来小细胞肺癌之治疗,除个别周围型者外,主要依仗非手 Small cell lung cancer, including oat cell cancer, accounts for 16-18% of all lung cancers. Once diagnosed, its natural median survival is less than 3 months. The five-year survival rate obtained by surgical resection or radiotherapy alone was only 1% or less. The five-year survival rate after radiotherapy for patients whose conditions were confined to the chest was strictly less than 10%. Surgery was lower than this. Due to the occurrence of chest spread in the early stages of the disease, it can be detected by every method other than the existing clinical tests. The positive rate of bone marrow biopsy is quite high (24 to 47%). Therefore, in recent years, the treatment of small cell lung cancer, in addition to individual peripheral type, mainly rely on non-hand