Thalidomide Combined With Chemotherapy in the Treatment of Relapsed or Refractory Yolk Sac Tumor

The oral dose of thalidomide is 1.5-2.5mg/kg/d daily (maximum 28g). Each cycle lasts for 21 days (every three weeks), and if treatment parameters are met as described in the study, cycle two and subsequent cycles begin on day 22. Treatment will be discontinued if there is drug-related dose-limiting toxicity or disease progression. Tumor response assessment will be repeated using AFP and LDH every one cycle and imaging examination every two cycles. Children who complete the trial may continue this regimen or undergo surgery or radiation therapy if their disease goes into remission.