** Interpace Diagnostics IDXG.O down 20 pct premarket as
cancer diagnostics co raises $7 mln of equity
** Stock among biggest losers across U.S. exchanges at 7:15
am ET
** Co offers 9.33 mln shares at $0.75, 17 pct discount to
stock's Thurs close urn:newsml:reuters.com:*:nGNX87GF9y
** Offering represents a third of co's free float and
roughly a month's worth of trading volume, per Refinitiv data
** H.C. Wainwright sole bookrunner for offering
** IDXG shares have fallen 17 pct over past one year
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