The study will evaluate the safety, tolerability and efficacy of LUT014 gel topically administered in breast cancer patients who developed radiation dermatitis. Subjects enrolled to part 1 will be enrolled to receive the study treatment (open label treatment) for 28 days and will be followed up for 2 months after the completion of study treatment. Subject in Part 2 will be randomized in 1:1 ratio to receive either the study drug or placebo (double-blind treatment) for qd topical application for 28 days and will be followed up for 2 months after the completion of study treatment.

Inclusion Criteria:

1. Female subjects diagnosed with stage Tis, T0-T3, N0-N2, M0 Breast Cancer;
2. Subject is ≥18 years at the time of signing the informed consent form (ICF);
3. Radiation dermatitis of Grade 2, based on the NCI CTCAE at the Screening and Baseline (D0) visits;
4. Completed fractionated radiation therapy for breast prior to first dose of study drug (Day 0);
5. A score of ≥ 6 reported in the Dermatology Life Quality Index at the Screening and Baseline Visits;
6. Eastern Cooperative Oncology Group (ECOG) performance status of 0-2;
7. Females of child-bearing potential must have a negative pregnancy test at screening and must agree to use an effective contraception method* or abstain from sex throughout the study until Day 83;
8. Expected life expectancy greater than 6 months

Exclusion Criteria:

1. Bilateral breast irradiation;
2. Planned internal mammary node irradiation with electrons. Planned photon coverage of internal mammary chain nodes is acceptable for inclusion in this study;
3. Planned partial breast accelerated irradiation;
4. Any cutaneous infection or significant skin disease at Screening or Baseline (Day 0) other than the dermatitis in the area(s) irradiated during fractionated radiation therapy;
5. T4 breast cancer or direct skin involvement by breast cancer;
6. Breast implants or underwent breast reconstruction;
7. Any cancer other than breast cancer within 3 years of Screening, except for carcinoma in situ of the cervix;
8. Pregnant or lactating;
9. History of active systemic lupus erythematosus or scleroderma that is believed to increase the risk of developing radiation-induced dermatitis or its severity;
10. Clinically significant co-morbid diseases
11. Treatment with a serine/threonine-protein kinase B-Raf (B-Raf) inhibitor, including but not limited to Zelboraf® (vemurafenib), Tafinlar® (dabrafenib), Braftovi® (encorafenib), and Nexavar® (sorafenib), within 30 days or 5 half-lives of the drug prior to Screening, whichever is longer;
12. Treatment with a topical corticosteroid o the irradiated chest area within 14 days prior to Baseline (Day 0).
13. Treatment with a systemic corticosteroid within 14 days prior to Baseline (Day 0), except for low dose systemic corticosteroids (e.g., 8-20 mg dexamethasone or comparable) given for up to one or two days every two weeks as part of standard of care for the prevention or treatment of chemotherapy-induced nausea and vomiting (CINV);
14. Treatment with any investigational drug within 30 days or 5 half-lives of drug prior to Screening, whichever is longer;
15. Known hypersensitivity to any of the inactive ingredients of the study drug.