The radiotherapy after surgery reduces the risk of recurrence and death is widely used for standard treatment for cancer including breast cancer and head and neck cancer. However, radiation dermatitis is a common side effect and major adverse event of radiotherapy. Radiation induces skin inflammation resulting in redness, itchiness and peeling skin. Radiation dermatitis may be acute or chronic. Acute skin changes occur within 90 days of initiating therapy due to inflammation and DNA damage and chronic skin changes may occur after several weeks or years. Radiation-irritated skin is a treatment-induced symptom caused by radiation dose-limiting toxicity. It damages skin structure and causes a variety of symptoms of cuticle thinning, reducing of collagen in subcutaneous, sweat glands damage, sebaceous glands damage and basal membrane damage. These conditions lead patients to lost work productivity, wound care costs, social isolation, altered body image and affect a patient's quality of life and mental health both during and after treatment and even interrupts the treatment schedule.

The treatment of radiation dermatitis is an essential component of radiotherapy. The common treatment includes agents and other dressing products, such as corticosteroid cream, hyaluronic acid, aloe and sucralfate, which are used to prevent or reduce severity of dermatitis. But there is no clear therapeutic or nursing guideline supporting continuous treatment of radiation dermatitis by topical agents currently.

In this study, Radiation Care® gel which contain Japanese honeysuckle extract will be used in breast and head and neck cancer patients to test the safety and efficacy to prevent radiation dermatitis and alleviate their radiation-irritated skin symptoms.

The primary objective of this study is to evaluate the clinical outcomes of "Radiation Care" gel application in breast cancer and head and neck cancer patients who have radiation dermatitis or radiation-irritated skin due to the radiotherapy.

Inclusion Criteria:

• Participants must be males or non-pregnant or non-lactating females at least 20 years of age.

• Subject must meet one of the following conditions:

  1. Diagnosis of non-inflammatory breast adenocarcinoma or in situ breast cancer which were treated by operation with or without adjuvant or neoadjuvant hormonal treatment.
  2. Diagnosis of epithelial carcinoma of nasopharynx, oropharynx, oral cavity, larynx, hypopharynx, paranasal sinus and salivary glands which were treated with or without operation, concurrent chemotherapy is accepted, in head and neck cancer patients.

• Patients were scheduled to receive at least three sessions of radiotherapy per week (1 session per day) for at least five weeks using standard irradiation fraction (with at least 1.8 Gy per session) for total dose of at least 50 Gy.

• Participant willing and must give signed informed consent.

Exclusion Criteria:

• Prior breast reconstructions, implants, and/or expanders.
• Previous radiotherapy to the area to be treated with radiation therapy (head and neck area or breast and thorax areas).
• Concurrent chemotherapy in breast cancer patients.
• Concurrent targeted therapy in head and neck cancer patients.
• Known radiosensitivity syndromes (e.g. Ataxia-telangiectasia)
• Collagen vascular disease, vasculitis, unhealed surgical sites, breast infections, rashes or unhealed wounds in the radiation field or systemic lupus erythematosus (SLE).
• Systemic diseases known to delay the skin healing process such as diabetes mellitus or severe renal failure.
• Use of a tissue-equivalent bolus.
• Use of over-the-counter topical medications containing steroids.
• Participation in any clinical trial in the prior 30 days from baseline.
• Any condition that, in the judgement of the investigator could impose hazards to the patient if study therapy is initiated or affect the participation of the patient in the study.