** Shares of Chimeric Therapeutics CHM.AX fall 50% to A$0.004
** Stock set for its weakest session ever, if losses hold
** Stock hits lowest level since May 12
** Biotechnology firm receives firm commitments to raise A$6.6 million ($4.24 million) via a placement
** Placement issue price for A$0.004 per share, a 50% discount to stock's last close
** Says funds to be used for advancing development of its CHM CDH17 cell therapy for the treatment of gastrointestinal and neuroendocrine tumours
** More than 42 million shares change hands, 6.9 times the 30-day average
** Stock down 40% YTD, including current session's moves
($1 = 1.5562 Australian dollars)
(Reporting by Nikita Maria Jino in Bengaluru)
((Nikita.Jino@thomsonreuters.com;))