I don't have a list and not sure if this qualifies as fringe but I have been long Nektar for a while now and their immunotherapy program is pretty under the radar (of course their 1.5B market cap doesn't make it a pure play here). They have used their PEG technology in pretty creative ways to develop some pipeline candidates. Their Immuno-oncology is very early though.
They mentioned 2 other pre-clinical programs that they said they would talk about at their R&D Day (10/8) NKTR-255 (IL-15 Cancer Immunotherapy) NKTR-218 (IDO Inhibitor)
I have been long the stock for a couple years and recently bought more thinking their royalty revenue potential represents good value even at current prices and then you have a potential big opportunity if NKTR-181 hits (it failed Phase 2 but they went ahead into P3 with a modified trial) and the under the radar Oncology assets especially now that 102 isn't priced in. I think NKTR-214 is really interesting if they really got the toxicity issue around IL-2 reduced. This is the slide deck from the jeffereies conference: http://files.shareholder.com/downloads/NKTR/0x0x833274/536E44DF-E108-4C26-B9FC-39D57C2EDA9E/FINAL_JEFFERIES_NKTR_Presentation-06022015.pdf
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