Oct 7 (Reuters) - Canada's main stock index ticked lower on Monday, led by losses in shares of cannabis producer Hexo Corp HEXO.TO , as well as concerns over the outcome of the U.S.-China trade talks this week.
* At 9:39 a.m. ET (1339 GMT), the Toronto Stock Exchange's S&P/TSX composite index .GSPTSE was down 50.33 points, or 0.31%, at 16,399.02.
* Hexo fell 5.5%, the most on the TSX, after its U.S.-based chief financial officer, Michael Monahan, stepped down.
* Its shares pushed the healthcare sector down 2.2%, the biggest percentage loser among eight of the index's 11 major sectors trading lower.
* Chinese officials were reluctant to agree to the United States' broad trade deal, according to a Bloomberg report, sending jitters among investors who are hoping for some progress in the talks scheduled to start this week. The energy sector .SPTTEN dropped 0.4% despite higher oil prices. U.S. crude CLc1 prices were up 1.1% a barrel, while Brent crude LCOc1 added 0.8%. O/R
* The financials sector .SPTTFS slipped 0.3% and the industrials sector .GSPTTIN fell 0.4%.
* The materials sector .GSPTTMT , which includes precious and base metals miners and fertilizer companies, lost 0.5% as gold futures GCc1 fell 0.5% to $1,498.2 an ounce. GOL/ MET/L
* On the TSX, 60 issues were higher, while 167 issues declined for a 2.78-to-1 ratio to the downside, with 9.21 million shares traded.
* The largest percentage gainers on the TSX were BlackBerry Ltd BB.TO , up 1.6%, and Exchange Income Corp EIF.TO , which rose 1.1%.
* The most heavily traded shares by volume were Aurora Cannabis ACB.TO , Hexo and Toscana Energy Income Corp TEI.TO .
* The TSX posted two new 52-week highs and three new lows.
* Across all Canadian issues, there were nine new 52-week highs and five new lows, with total volume of 17.32 million shares.