Anyone heard of VP-6?

After a total spine MRI, a "walnut-sized" tumor was discovered in my spinal cord, mid to lower back.  It appears that some of the cancer from my AAIII (inoperable) have moved into the spinal fluid and the blockage is preventing proper flow of the spinal fluid, this affecting the nerves that control my legs and feet.  I am numb from about mid-thigh down and within the last two months have gone from walking to a wheel-chair.  My doctor at Duke started me on radiation for the back tumor last week, and wants to begin a chemo in a few days, something he referred to as VP-6?  Is anyone familiar with this drug?  I don't know the pharmeceutical name or spelling.  I want to read some info on it.  Thanks for any help!