“…Interval between primary BC and BCLM was a positive factor in the studies by Selzner, Pocard, and Caralt [20,22,37] but not so in several other studies [21,24,26,27,31,35,36]. Size, site or number of BCLM were not generally found to be of significance, except that >1 BCLM was a negative factor in one study [23] (table 2).…”