Evaluating Lapatinib + Capecitabine in Patients Aged 70 and Over With HER2 Metastatic Breast Cancer.

More than half of patients who have breast cancer with Her2-positive tumors treated with trastuzumab as a single agent develop resistance within one year of treatment initiation.

Recent studies on this population of patients show that the use of Capecitabine combined with Lapatinib demonstrates an improvement of TTP without an increase of serious toxic effects.

Our study is designed to investigate whether elderly patients with locally advanced or metastatic breast cancer over-expressing HER2 could take advantage of the combination lapatinib (1250mg/day) and capecitabine (1st cycle day 1 to day 14: 850mg/m2/day x2; next cycles day 1 to day 14: 1000 mg/m2/day x2) in term of clinical benefit, and with no adverse effects and no detrimental impact on functional status (part of geriatric assessment). Treatment will continue until disease progression or unacceptable toxicity occurence.

This is a phase II multicentric trial associated to a pharmacokinetic study which aims to assess the effect of age modifications (absorption, distribution, metabolism and elimination) on the combination Lapatinib-Capecitabine by measuring the Cmin-Cmax of both components in elderly patients.

Inclusion criteria

• Age ≥ 70
• Histological confirmed advanced breast cancer (metastatic or locally advanced)
• Tumor over expressing HER2 (HER2 3+ in IHC or IHC 2+ and Fish positive) in sample from the primary and/or secondary tumor
• WHO performance status (EGOG) from 0 to 2
• MMS > 25
• Measurable disease (RECIST criteria)
• Progression of disease after one metastatic line of chemotherapy associated with trastuzumab (must be stopped at least 3 weeks before beginning the trial)
• Adequate hematological function (Hb ≥ 10g/dl, ANC ≥ 1500/mm3, platelets ≥ 100 000/mm3)
• Adequate hepatic function (total bilirubine ≤ 1.5ULN, ASAT and ALAT ≤ 3ULN)
• Adequate renal function (measured or calculated creatinine clearance ≥ 40 ml/min - Cockroft)
• LVEF ≥ 50% (US or isotopic method)
• Absence of treatment by enzymatic inhibitors or inducers or any gastric pH modifying agent/drug within a 7-to-14 day period preceding the first administration of one of the trial's products and within the overall duration of the study (see medication list)
• Patients must be affiliated to a Social Security System
• Patient information and written informed consent form signed

Exclusion criteria

• Life expectancy < 3 months
• Prior treatment with capecitabine or lapatinib
• Concomitant radiotherapy except for palliative reason and more than 25% of the BM
• Patients with pre-existing toxicity ≥ grade 2 (excepted alopecia)
• Patients with dysphagia, or inability to swallow the capsules.
• Patient with malabsorption syndrome or disease significantly affecting gastro-intestinal function or with major resection of stomach or proximal bowel that could affect absorption of oral drugs
• Patient already included in another therapeutic trial using an experimental drug within 30 days preceding entry into the study
• Individual deprived of liberty or placed under the authority of a tutor
• Patient with any psychological, familial, sociological or geographical condition potentially hampering compliance with the study protocol and follow-up schedule.