Statement: the secondary trial and the primary trial do not test the same modalities of cancer treatments.
Primary_evidence: INTERVENTION 1:    Lapatinib Plus Capecitabine   Participants received a daily dose of 5 tablets of lapatinib (1250 mg) at approximately the same time every day, either 1 hour (or more) before breakfast or 1 hour (or more) after breakfast. Participants also received capecitabine 2000 mg/m^2) per day (divided and administered orally twice daily, 12 hours apart), for 14 days, every 21 days. Capecitabine was taken with food or within 30 minutes after food. Participants received study medication until disease progression, unacceptable toxicity, or participant withdrawal. INTERVENTION 2:    Trastuzumab Plus Capecitabine   Participants received an IV infusion of trastuzumab 8 mg/kg on Day 1, followed by a 6 mg/kg infusion every 3 weeks. Participants also received capecitabine 2500 mg/m^2 per day (divided and administered orally twice daily, 12 hours apart), for 14 days, every 21 days. Capecitabine was taken with food or within 30 minutes after food. Participants received study medication until disease progression, unacceptable toxicity, or participant withdrawal.
Secondary_evidence: INTERVENTION 1:    Behavioral Dietary Intervention   Beginning 2-4 weeks after completion of lumpectomy, patients receive food diaries to complete for 7-10 days. Dietary counselors then give patients guidelines for dietary modifications to reduce caloric intake by 25% of their normal diet. Patients follow caloric restricted diet for 10 weeks (2 weeks prior to radiation therapy, during 6 weeks of radiation therapy, and at least 2 weeks after radiation therapy). Patients undergo radiation therapy QD 5 days a week for 6 weeks.   Behavioral dietary intervention: Receive caloric restricted dietary intervention   Therapeutic conventional surgery: Undergo definitive lumpectomy   Radiation therapy: Undergo radiation therapy   Counseling intervention: Receive dietary counseling   Quality-of-life assessment: Ancillary studies