<prompt> Lymph node first involved in Ca breast isareAxillaryInternal mammarySupraclavicularContralateral axillary  <response>: .Levels of the axillary nodes Level I : Below and lateral to the pectoralis minor muscle--anterior, lateral, posterior Level II : Behind the pectoralis minor muscle--central Level III : Above and medial to pectoralis minor muscle-- apical Note in carcinoma breast Spread restricted to level I nodes carries better prognosis Spread to level II has poor prognosis Spread to level III indicates worst prognosis. ref:SRB;s manual of surgery,ed 3,pg no 455 