I'm culturing these cells too, I have got my cells from ATCC. I am too not sure about how to grow them, no one I know has handled these cells before. The cells are supposedly suspension cultures, as mentioned by ATCC. A good number of them attach to the flask, and most of them grow as clustered floating cells. I'm currently trying to calculate their doubling time, in first expt it was about 18-24 hours. They grow pretty rapidly as heterogeneous population and require a medium change/subculture every 2-3 days.
Any more observations from other users will be highly welcome