Oncolytic Virus Ad-TD-nsIL12 for Progressive Pediatric Diffuse Intrinsic Pontine Glioma

After stereotactic biopsy, the Ommaya reservoir will be inserted through the biopsy channel and two injections of Ad-TD-nsIL12 will be delivered after surgery by Ommaya reservoir (with an interval of 3days). The interval between following injections in the subsequent treatment period will be 3 weeks ±4 days. The assigned dose for each patient will be 3x10\^9vp, 1x10\^10vp or 3x10\^10 vp suspended in 1 ml NS according to cohort design.