Inclusion Criteria:

   - Men and women ≥ 18 years of age.

   - For patients with metastatic basal cell carcinoma (BCC), histological confirmation of
   distant BCC metastasis (eg, lung, liver, lymph nodes, or bone), with metastatic
   disease that is Response Evaluation Criteria in Solid Tumors (RECIST) measurable using
   computed tomography (CT) or magnetic resonance imaging (MRI).

   - For patients with locally advanced BCC, histologically confirmed disease that is
   considered to be inoperable.

   - For patients with locally advanced BCC, radiotherapy must have been previously
   administered for their locally advanced BCC, unless radiotherapy is contraindicated or
   inappropriate. For patients whose locally advanced BCC has been irradiated, disease
   must have progressed after radiation.

   - For women of childbearing potential, agreement to the use of two acceptable methods of
   contraception, including one barrier method, during the study and for 12 months after
   discontinuation of vismodegib (GDC-0449).

   - For men with female partners of childbearing potential, agreement to use a latex
   condom, and to advise their female partner to use an additional method of
   contraception during the study and for 3 months after discontinuation of vismodegib.

Exclusion Criteria:

   - Prior treatment with vismodegib or other Hedgehog pathway inhibitors.

   - Pregnancy or lactation.

   - Life expectancy of < 12 weeks.

   - Patients with superficial multifocal BCC who may be considered unresectable due to
   breadth of involvement.

   - Concurrent non-protocol-specified anti-tumor therapy (eg, chemotherapy, other targeted
   therapy, radiation therapy, or photodynamic therapy).

   - Recent, current, or planned participation in an experimental drug study.

   - History of other malignancies within 3 years of the first day of treatment with
   vismodegib in this study (Day 1), except for tumors with a negligible risk for
   metastasis or death, such as adequately treated squamous-cell carcinoma of the skin,
   ductal carcinoma in situ of the breast, or carcinoma in situ of the cervix.

   - Uncontrolled medical illnesses such as infection requiring treatment with intravenous
   antibiotics.