AVNR Oct 8 calls (volume: 9400, open int: 790, implied vol: ~110%, prev day implied vol: 88%) -- nearly 5K contracts traded in single transaction on the offer. Stock saw 12% jump on Sept 10 (on heavy volume) following its Sept 9 at Morgan Stanley Healthcare conference. Top-line results from Alzheimer'study are expected late September/early October 2014.