What to expect from radiotherapy for ductal carcinoma in situ

Ductal carcinoma in situ, or DCIS, consists of abnormal cells within a breast duct. When radiotherapy is recommended after breast-conserving surgery, it treats the breast area where the DCIS was removed and may reduce the chance of cells remaining there becoming a later problem. Your pathology, operation, margins, breast size, age, and other health factors help shape the recommendation.

A planning visit uses examination and imaging to map the treatment field. At each visit, you lie still while the machine delivers radiation; the session is brief, although the overall course includes repeated appointments. Possible effects include redness or darkening, warmth, dryness, swelling, tenderness, breast firmness, and tiredness. The treated breast may look or feel different for a time.

Tell the team about breast implants, previous radiation, skin conditions, medicines, and any chance of pregnancy. Wear soft clothing, wash gently, pat the skin dry, and use only products recommended for the treatment area. Avoid friction, strong heat, and direct sun. A supportive bra may help if the breast feels heavy or tender.

Keep a manageable routine, take short rests, eat regularly, and use gentle movement if comfortable. Let the team know if soreness, swelling, or fatigue affects sleep or daily tasks. Do not apply a new cream, stop prescribed medicines, or miss a visit without contacting the clinic for advice.

Contact your team promptly if the skin becomes blistered, wet, very painful, or rapidly more swollen, or if the breast develops increasing warmth with fever or chills. Report new breathlessness, persistent cough, or chest pain urgently. Seek emergency help for severe breathing difficulty, fainting, or chest pain that does not settle.

Ask why radiotherapy is recommended for your DCIS, which breast area will be treated, and whether a shorter or partial-breast plan is suitable. Ask how surgery and hormone treatment fit together, which skin products are safe, and which breast swelling, pain, or breathing symptoms need urgent advice.