Early disease:

Palpable mass
Breast pain
Nipple discharge
Ulceration
Skin dimpling
Edema
Erythema
Axillary mass
Scaling of the nipple (Paget's disease)

Advanced disease:

Fixation of the mass to the chest wall
Axillary lymphadenopathy
Edema of the arm
Breast enlargement
Ulceration
Supraclavicular lymphadenopathy
Back pain
Bone pain
Jaundice
Weight loss