A $10 billion market cap (~100/share) is very unlikely. But consider the value lost by CLDX after the failure of Rintega: CLDX lost nearly $400 million in market cap over the lost market potential for treating a small sub-group of GBM patients, and there was very likely selling from insider information even before the announcement. Theoretically, had Rintega been approved, it's probably a safe bet that Rintega alone would contribute somewhere near $1 billion to the market cap of CLDX.
Now, since DCVax-L treats a much larger patient population, it's very likely that NWBO becomes a stock with a $20 to $30 share price (MC = $2B to $3B) in short order. Approval also validates the DCVax platform and increases the likelihood that other indications in existing trials will also be successful. So eventually the market cap will reflect that increased probability of success in some way, shape or form.
Could NWBO become a $100 stock with a market cap in excess of $10 billion? Maybe over a few years with the continued success of other trials, but the immediate future is still very promising given where the stock price is right now.