Clerics have the ability to spontaneously cast a cure spell if they have a spell slot of the same level to trade out for it. Does this mechanic apply to breath of life? Normally I would think not however the way the spell reads is very similar to that of the other cure spells and it even heals 1d8 more than the previous cure spell to keep the leveling trend going. "This spell cures 5d8 points of damage + 1 point per caster level (maximum +25)." emphasis on "cures".