Hmm..I'm not the best resource regarding stats...
But it being limited to one lobe seems to give you lobectomy or partial lobectomy option. (might want a
circulating tumor test to inform your decisions)
Some bits on liver met options here:
http://her2support.org/vbulletin/sho...053#post221053
If you go surgery route, consider:
Opiates/Opioids (accelerates cancer?, alternatives)
http://her2support.org/vbulletin/showthread.php?t=42074
If you really want a "targeted treatment", consider a biopsy and chemosensitivity testing