RTA 408 Lotion in Patients at Risk for Radiation Dermatitis - PRIMROSE

Inclusion Criteria:

1. Adult female patients (18 to 75 years of age, inclusive);

2. Patients diagnosed with ductal carcinoma in situ or non-inflammatory breast
adenocarcinoma who have been referred for post-operative radiotherapy and have had no
prior radiation treatment to that breast;

3. Patients planning to undergo 3D conformal radiation therapy to the whole breast (as
part of breast-conservation therapy / lumpectomy) or chest wall (as part of
post-mastectomy irradiation), with or without treatment of regional lymph nodes
(i.e., axillary, supraclavicular, or internal mammary), using one of the following
treatment schedules:

1. 45 - 50.4 Gy in 1.8 Gy per day, in addition to 10-16 Gy boost

2. 46 - 50 Gy in 2 Gy per day, in addition to 10-16 Gy boost;

4. Patients who received breast-conservation therapy / lumpectomy must be receiving ≥
107% of the total radiation dose (calculated from the total radiation dose including
boost) to any portion of the breast, based on radiation inhomogeneity, and/or have a
breast volume ≥ 1200 cc;

Exclusion Criteria:

1. Patients with Stage T4 or Stage IV breast cancer;

2. Patients with prior radiation therapy to the breast treated in this study;

3. Patients with type V or VI skin according to the Fitzpatrick scale;

4. Patients with bilateral breast cancer;

5. Patients receiving partial breast irradiation therapy;

6. Patients with uncontrolled diabetes (HbA1c > 11.0%, historical values within 6 months
of screening are acceptable);

7. Patients with collagen vascular disease or vasculitis;

8. Patients with concurrent active malignancy other than adequately treated basal cell
carcinoma of the skin or carcinoma in situ of the cervix;

9. Patients with active bacterial, fungal or viral skin infections;

10. Patients with known active hepatitis B or hepatitis C infection;

11. Patients who intend to use any other topical cream, lotion or preparation applied to
the radiation treatment area;

12. Patients receiving concomitant chemotherapy during the course of the planned
radiation treatment regimen. Patients are eligible if they are receiving sequential,
neoadjuvant or adjuvant chemotherapy that is not anticipated to be delivered during
the time course of the radiation treatment regimen.