PainChek hits over four-month high on expanded Sabra agreement uptake

** Shares of Australia's PainChek PCK.AX gains as much as 41.4% to A$0.140, their highest since June 4

** Stock logged its biggest intraday gain since April 14

** Medtech firm says expanded commercial uptake under its master services agreement with Sabra Health Care REIT SBRA.O

** Adds expansion expands its Sabra footprint to 23 US communities across five operators

** Around 1.1 mln shares change hands, nearly 9.7x 30-day average

** PCK down 63.8% YTD