A Study Comparing Eribulin Mesylate and Ixabepilone in Causing or Exacerbating Neuropathy in Patients With Advanced Breast Cancer

Inclusion criteria:

1. Female subjects with confirmed locally recurrent or metastatic carcinoma of the breast
who have received prior taxane therapy and at least one prior cytotoxic chemotherapy
regimen for advanced disease.

Exclusion criteria:

1. Subjects who have received prior ixabepilone therapy.

2. Subjects with prior participation in an eribulin clinical study, even if not assigned
to eribulin treatment.

3. Subjects with pre-existing neuropathy Grade greater than or equal to 2.

4. Subjects with a history of diabetes mellitus Type 1 or 2.

5. Subjects with bilateral mastectomy which included bilateral axillary lymph node
dissection.

6. Subjects with missing digits required for vibration assessment.

7. Subjects with any other concurrent diseases or conditions that would be expected to
interfere with neuropathy assessments, which may include vitamin deficiency, sequelae
of cerebrovascular disease, thyroid insufficiency, lumbar or cervical radiculopathy,
or alcoholic or inflammatory neuropathy.