唾液腺肿瘤比其他头颈部恶性肿瘤少见。其组织学类型多种多样,通常倍增时间长,有迟发性局部复发和远处转移的倾向。即使有远处转移,但由于肿瘤生长较慢,患者生存时间仍较长。治疗多采用单纯手术或术后对残存病灶行补充放疗。低LET射线常规分割放疗,对术后残存病灶或不能行手术切除的病灶仅能部分控制。因而作者试用高LET放射治疗,例如快中子和高LET带电粒子。生长较慢和倍增 Salivary gland tumors are rarer than other head and neck malignancies. Its histological types are diverse, usually with long doubling times, with delayed local recurrence and distant metastases. Even if there is distant metastasis, the survival time of the patient is still longer because of the slower tumor growth. The treatment often uses only surgery or postoperative supplemental radiotherapy for residual lesions. Conventional fractionated radiotherapy with low LET radiation can only partially control residual lesions or lesions that cannot be surgically removed. The authors therefore experimented with high-LET radiation therapy, such as fast neutrons and high LET charged particles. Slower growth and multiplication