In recent years, the advance in high-throughput techniques, such as microarrays and next gen sequencing (NGS) technologies, have allowed a more precise classification of the breast cancer molecular subtypes and a more personalized approach to anti-cancer therapy. To date, conventional methods to select patients for clinical trials with anti-targeted agents according to molecular criteria are generally limited to the analysis of a few biomarkers. Recent studies have shown how this strategy is inappropriate in case of infrequent molecular alterations and that the ideal strategy would consist in simultaneous examination of large numbers of actionable genomic alterations.

This is the first genomic screening platform ever attempted in Spain. By this molecular platform SOLTI aims to increase the likelihood of a patient being included in a trial designed specifically for her molecular tumor type. Thus, the primary objective of this pilot study is to determine the Platform's effectiveness to include patients in clinical trials with targeted agents based on the tumor molecular profiling.

This is a prospective, multicenter, pilot study conducted in eight sites located in Spain. Up to 260 female or male patients, between 18-70 years with advanced or metastatic breast cancer will be screened. These patients will be about to receive, or receiving, or will have received treatment for their disease in either a clinical trial or the healthcare setting. Quality of life score according to ECOG scale ≤ 2 and a minimal life expectancy of 3 months. Upon signed inform consent and confirmation of eligibility criteria, tumor samples will be obtained from the patients either by biopsy of metastatic cancer or from archived tissue previously available at the site, and their genomic profile will be analyzed. It will be assessed the mutational status of a panel of genes considered relevant to the tumor biology and treatment. Detected variants /mutations in samples will not be classified according to their origin somatic or germline, since no normal paired DNA will be analyzed. Should any clinical trial match the patient's molecular profile, she/he will be offered to participate in it and the available samples left after sequencing will be supplied when a central confirmation would be requested. The patient's clinical data will be collected on a quarterly basis until death or consent withdrawal.

Mutation testing will be carried out at three laboratories experienced in high-throughput sequencing techniques: the VHIO Cancer Genomics Core laboratory of Barcelona, at Genomics Laboratory of the Research Institute of the Doce de Octubre University Hospital of Madrid and at the Genomics laboratory of the University Clinical Hospital of Valencia. There is a need to join efforts, set standards and optimize procedures for the benefit of all patients, so that the opportunity to participate in a genomic screening program can be offered to the great majority of hospitals that lack the technology required for these tests.

Inclusion Criteria:

• Female or Male patients
• Between 18 and 70 years of age
• Signed informed consent prior to any screening procedure
• Advanced or Metastatic breast cancer of any subtype confirmed both pathologically and radiologically (stage IIIb- IV disease)
• The patient may present with a responding, stable or progressive disease
• The subjects must be about to receive, or receiving, or will have completed treatment for their metastatic disease with any line of treatment in either a clinical trial or the healthcare setting
• Availability of one archived initial or metastatic tumor sample. If archived material were not available, a biopsy of the metastatic cancer should be performed to obtain such material.
• Measurable or non-measurable disease
• Quality of life score according to ECOG scale ≤ 2
• Minimal life expectancy of 3 months

Exclusion Criteria:

• Presence of progressive disease at the time of inclusion requiring treatment initiation before genomic profile results are obtained
• LVEF<50% (MUGA)
• Inadequate bone marrow reserve or organ dysfunction shown by any of the following laboratory values:
• Absolute neutrophil count
• Platelet count< 100 x 109/L
• Hemoglobin < 90 g/dL
• AST/ALT > 2.5 times the upper limit of normality if no demonstrable hepatic metastases, or > 5 times the upper limit of normality in the presence of hepatic metastases
• Total bilirubin > 1.5 times the upper limit of normality
• Creatinine>1.5 times the upper limit of normal
• Corrected calcium > upper limit of normality
• Phosphate > upper limit of normality
• Presence of any other type of cancer, except suitably

The study will be conducted in eight sites located in Spain, and up to 260 patients with advanced or metastatic breast cancer will be screened. These patients will be about to receive, or receiving, or will have received treatment for their disease in either a clinical trial or the healthcare setting