Biomarkers in Patients With Metastatic Breast Cancer

Identify the Number of Eligible Patients for Immunotherapy According to the Epidemiological and Biological Profile in Tunisia

In order to allow Tunisian patients with breast cancer to access immunotherapies, and innovative treatments to extend life expectancy of patients with breast cancer with a poor prognosis, it is important to study the epidemiological profile of Tunisian cancers breast, in terms of PD-L1 expression, tumor mutational burden (TMB), microsatellite instability status (MSI) and rate of TILs, in metastatic and locally advanced cases, in Tunis, over a one-year follow-up period. It is also important to study other inflammatory and tumor biomarkers which would have a prognostic or even therapeutic value: * serum dosage of LDH (lactate dehydrogenase) * IL-6 (interleukin 6) * CRP (C-reactive protein) * absolute count of lymphocytes (CLA) and eosinophils * quantification of circulating tumor DNA before treatment and under treatment. The primary objective id to identify the epidemiological profile of the biological signature (PD-L1 / TMB / MSI/HRD/ TILs) of patients with locally advanced or metastatic breast carcinoma before and during the systemic treatment.

Procedure: 1. Verification of the inclusion / non-inclusion criteria 2. Signing the consent form 3. Surgical, Medical and family history, ongoing treatments 4. Clinical Examination1 5. Radiological examinations 2 6. TNM Classification (Appendix 3) 7. Standard biochemical assessment 3 8. Inflammatory assessment (CRP, LDH, IL6) 9. Hematological assessment (NFS, platelets) 10. Tumor markers (ACE, CA15-3) 11. Histological and molecular examination 4: * Expression PD-L1 by IHC (Immuno-Histochemistry) * TILs by IHC * \- MSI status: MMR \* proteins (Mismatch Repair Protein) (Appendix 4) by NGS via TruSight™ Oncology 500 Kit (Illumina) , if PD-L1\>1% * Score HRD : by NGS via TruSight™ Oncology 500 Kit (Illumina) , if PD-L1\>1% * TMB mutational burden by next generation sequencing Next Generation Sequencing (NGS) via TruSight™ Oncology 500 Kit (Illumina) if PD-L1\>1% * tDNA by digital PCR 12. Radiological evaluation5 13. Indication of surgery? (if yes type of surgery to be specified) 14. Evaluation of adverse events / effects: Tolerance of the previous treatment 15. Completion the source documents and the eCRF Clinical Exam1: * General State according to the WHO classification or according to the Karnowsky Index * Breast examination: inspection (symmetry, appearance of the skin), palpation (size of the tumor, presence of mammary discharge). * Examination of the axillary and supraclavicular lymph node areas * Abdominal examination * Pulmonary auscultation * Skeleton examination Radiological examination2: * Mammography and echo-mammary * Thoraco-abdomino-pelvic CT scan * Bone scintigraphy * Cardiac ultrasound Standard biochemical balance3: Blood group, creatininemia, blood ionogram, calcemia, glycemia, bilirubin, transaminases, gamma-GT, alkaline phosphatases, total cholesterol, triglycerides, uric acid, albuminemia. Histological examination4: * Biopsy with part number assigned by the laboratory, name of the laboratory * Histological type * Grade of Scarff-Bloom and Richardson (SBR) * Estrogen receptors, progesterone receptors * Her2Neu * Ki67 * PD-L1 * TILs * MMR Molecular Examination4: * MSI status by pentaplex PCR and capillary electrophoresis by NGS platform via the TruSight™ kit Oncology 500 (Illumina) * HRD Score by NGS platform via the TruSight™ kit Oncology 500 (Illumina) * Mutational burden TMB by NGS platform via the TruSight™ kit Oncology 500 (Illumina) * Circulating tumor DNA by digital PCR Radiological assessment5: * If the stage is locally advanced (appendix 3): Breast ultrasound +/- Mammography +/- Breast MRI * If metastatic stage: Thoraco-abdomino-pelvic CT scan 12 \| 27 Visit details • Initial visit D0 (V1) * Signature of informed consent form * Verification of inclusion / non-inclusion criteria * Medical, surgical and family history * Current treatments * Clinical examination1 * Radiological examinations2 * TNM classification * Standard biochemical assessment3 * Inflammatory assessment (CRP, LDH, IL6) * Hematological assessment (NFS, platelets) * Tumor markers (ACE, CA15-3) * Histological examination with immunohistochemistry and molecular4: * Biopsy with part number assigned by the lab, name of the lab * Histological type * SBR grade * Estrogen receptors, progesterone receptors * Her2Neu * Ki67 * PD-L1 * TILs * MMR * MSI * HRD * TMB mutational charge * ctDNA o Completion of source documents and eCRF * Visit after 3 chemotherapy treatment cycles (V2) * Current treatments * Clinical examination1 * Hematological assessment (NFS, platelets) * Tumor markers (ACE, CA15-3) * Radiological assessment5 * Evaluation of adverse events / effects: Tolerance of the previous treatment * Completion of source documents and eCRF * Assessment visit (V3) o Current treatments o Clinical examination1 * TNM classification * Inflammatory assessment (CRP, LDH, IL6) * Hematological assessment (NFS, platelets) * Tumor markers (ACE, CA15-3) * Histological examination with immunohistochemistry and molecular4: * Biopsy with part number assigned by the lab, name of the lab * Histological type * SBR grade 13 \| 27 * Estrogen receptors, progesterone receptors * Her2Neu * Ki67 * PD-L1 * TILs * ctDNA o Radiological assessment5 o Assessment of adverse events / effects o Fill in the source files and the eCRF * Follow-up visit at 3 months (V4) o Current treatments o Clinical examination1 o Tumor markers (ACE, CA15-3) o Radiological examinations2 o Evaluation of adverse events / effects * Completion of source documents and eCRF * Follow-up visit at 6 months (V5) o Current treatments o Clinical examination1 o Tumor markers (ACE, CA15-3) * Radiological examinations2 * Evaluation of adverse events / effects * Completion of source documents and eCRF

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