So my son was put on gabapentin for he was experiencing pain in both thighs radiating from around his lower spine area, he has recently found out he has mestastic mixed choriocarcinoma(predominate) and embryonal carcinoma . I know my son was on this for a month before he got really bad and in icu for this cancer but why have him on this if it has not helped him understanding he has tumors that are squeezing on his nerves so why they want to have him on this