3507206 SYST sarcomatoid YST 3 3507205 SYST sarcomatoid yolk sac tumor 2 3507212 SysT systemic therapy 2 3507208 SYST sacrococcygeal yolk sac tumor 1 3507207 SYST Shenyanshu Tablets 1 3507211 SYST systemic hypothermia alone 1 3507209 SYST systemic treatment 1 3507210 SYST systemic treatment only 1