Cumulative incidence of distant progression was 147 % ( 107-192 ) in the STAS group , 173 % ( 130-221 ) in the STAS plus zoledronic acid group , 142 % ( 103-187 ) in the ITAS group , and 111 % ( 76-152 ) in the ITAS plus zoledronic acid group ; no differences were recorded between groups .