An Observational Study on Human Epidermal Growth Factor Receptor (HER) 2 Status of Breast Invasive Carcinoma in Latin American Participants

Study Overview
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Brief Summary
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This is a descriptive, prospective, observational and epidemiological study on participants recently diagnosed with breast cancer to evaluate the HER2 status by IHC and SISH procedures.

Official Title
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Epidemiological, Prospective and Observational Study on the HER2 Status in Breast Invasive Carcinomas Assessed by Immunohistochemistry (IHC) and Silver In-situ Hybridization (SISH) in a Sample of Latin-American Patients

Conditions
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Breast Cancer

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: - Anatomopathological samples (surgical specimens or when a surgical sample is not possible, a core needle biopsy may be used) from female participants with a histopathological diagnosis of invasive breast cancer Exclusion Criteria: Samples whose residual material in the paraffin block(s) is insufficient for neoplasm representation in the procedures in this study Cancer samples that have received previous chemotherapy treatment

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Breast Cancer Participants<br>Breast tissue samples from female participants with a breast cancer diagnosis that undergo an anatomopathological examination of surgical specimens and/or core needle biopsies will be considered for analysis in this study. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of Participants With Human Epidermal Growth Factor Receptor 2 (HER2) Status in Breast Cancer Specimens Using Immunohistochemistry (IHC) and Silver In-Situ Hybridization (SISH) Procedures | HER2 status of the collected tissue samples was determined based on the results obtained from IHC test and SISH procedure. The IHC test gives a score of 0 to 3 positive (+) that measures the amount of HER2 receptor protein on the surface of cells in a breast cancer tissue sample. If the score is 0 to 1+, it's called HER2 negative (-). If the score is 2+, it's called borderline. A score of 3+ is called HER2 positive. Tissue samples which had the IHC score of 2+ (borderline) were re-tested using SISH procedure for confirmation of the HER2 status. Tissue samples with SISH test results + were considered as HER2+. Tissue samples for which HER2 status was not determined were considered as HER2 equivocal. | Baseline up to 30 months | 
| Percentage of Participants With Different Phenotypes of Breast Cancer | Breast cancer phenotypes were classified in to a) Luminal A: tissue samples that were estrogen receptor (ER) + and/or progesterone receptor (PR) +, HER2-, and either histologic grade 1 or 2; b) Luminal B: tissue samples that were ER+ and/or PR+ and HER2+ or ER+ and/or PR+ and HER2- and histologic grade 3; c) HER2 enriched: tissue samples that were ER-, PR-, and HER2+; d) Triple negative: tissue samples that were negative for ER, PR, and HER2. Histological grading was done by Nottingham Histologic Score system based on three factors, a) the amount of gland formation (differentiation), b) the nuclear features (pleomorphism) and c) the mitotic activity. Each of these features is scored from 1-3, and then each score is added to give a final total score ranging from 3-9. The final total score is used to determine the grade in the following way: i) Grade 1 tumors have a score of 3-5, ii) Grade 2 tumors have a score of 6-7, and iii) Grade 3 tumors have a score of 8-9. | Baseline up to 30 months | 
| Percentage of Participants With Histological Sub-types of Breast Cancer | Histological subtypes of breast cancer included ductal carcinoma, lobular carcinoma, mucinous carcinoma, mixed carcinoma, metaplastic carcinoma, and others. | Baseline up to 30 months | 
| Percentage of Participants With ER Status (Positive or Negative) Across Different Age Groups | Participants were categorized in to following age groups: a) less than (<) 40 years, b) 40-49 years, c) 50-59 years, d) 60-69 years, e) greater than or equal to (≥) 70 years. | Baseline up to 30 months | 
| Percentage of Participants With ER Status (Positive or Negative) Based on Nuclear Grades | Nuclear pleomorphism was observed and graded accordingly. Grade 1: Nuclei small with little increase in size in comparison with normal breast epithelial cells, regular outlines, uniform nuclear chromatin, little variation in size; Grade 2: Cells larger than normal with open vesicular nuclei, visible nucleoli, and moderate variability in both size and shape; Grade 3: Vesicular nuclei, often with prominent nucleoli, exhibiting marked variation in size and shape, occasionally with very large and bizarre forms. | Baseline up to 30 months | 
| Percentage of Participants With ER Status (Positive or Negative) Based on Lymphovascular Invasion | Lymphovascular invasion is entering of breast cancer cells in to the lymph or vascular/blood channels. | Baseline up to 30 months | 
| Percentage of Participants With PR Status (Positive or Negative) Across Different Age Groups | Participants were categorized in to following age groups: a) <40 years, b) 40-49 years, c) 50-59 years, d) 60-69 years, e) ≥70 years. | Baseline up to 30 months | 
| Percentage of Participants With PR Status (Positive or Negative) Based on Nuclear Grades | Nuclear pleomorphism was observed and graded accordingly. Grade 1: Nuclei small with little increase in size in comparison with normal breast epithelial cells, regular outlines, uniform nuclear chromatin, little variation in size; Grade 2: Cells larger than normal with open vesicular nuclei, visible nucleoli, and moderate variability in both size and shape; Grade 3: Vesicular nuclei, often with prominent nucleoli, exhibiting marked variation in size and shape, occasionally with very large and bizarre forms. | Baseline up to 30 months | 
| Percentage of Participants With PR Status (Positive or Negative) Based on Lymphovascular Invasion | Lymphovascular invasion is entering of breast cancer cells in to the lymph or vascular/blood channels. | Baseline up to 30 months | 
| Percentage of Participants With HER2 Status (Positive or Negative) Across Different Age Groups | Participants were categorized in to following age groups: a) <40 years, b) 40-49 years, c) 50-59 years, d) 60-69 years, e) ≥70 years. | Baseline up to 30 months | 
| Percentage of Participants With HER2 Status (Positive or Negative) Based on Nuclear Grades | Nuclear pleomorphism was observed and graded accordingly. Grade 1: Nuclei small with little increase in size in comparison with normal breast epithelial cells, regular outlines, uniform nuclear chromatin, little variation in size; Grade 2: Cells larger than normal with open vesicular nuclei, visible nucleoli, and moderate variability in both size and shape; Grade 3: Vesicular nuclei, often with prominent nucleoli, exhibiting marked variation in size and shape, occasionally with very large and bizarre forms. | Baseline up to 30 months | 
| Percentage of Participants With HER2 Status (Positive or Negative) Based on Lymphovascular Invasion | Lymphovascular invasion is entering of breast cancer cells in to the lymph or blood/vascular channels. | Baseline up to 30 months | 
| Percentage of Participants With Different Phenotypes of Breast Cancer Across Different Age Groups | Breast cancer phenotypes were classified in to a) Luminal A: tissue samples that were ER+ and/or PR+, HER2-, and either histologic grade 1 or 2; b) Luminal B: tissue samples that were ER+ and/or PR+ and HER2+ or ER+ and/or PR+ and HER2- and histologic grade 3; c) HER2 enriched: tissue samples that were ER-, PR-, and HER2+; d) Triple negative: tissue samples that were negative for ER, PR, and HER2. Participants were categorized in to following age groups: a) <40 years, b) 40-49 years, c) 50-59 years, d) 60-69 years, e) ≥70 years. | Baseline up to 30 months | 
| Percentage of Participants With Different Phenotypes of Breast Cancer Based on Nuclear Grades | Breast cancer phenotypes were classified in to a) Luminal A: tissue samples that were ER+ and/or PR+, HER2-, and either histologic grade 1 or 2; b) Luminal B: tissue samples that were ER+ and/or PR+ and HER2+ or ER+ and/or PR+ and HER2- and histologic grade 3; c) HER2 enriched: tissue samples that were ER-, PR-, and HER2+; d) Triple negative: tissue samples that were negative for ER, PR, and HER2. Nuclear pleomorphism was observed and graded accordingly. Grade 1: Nuclei small with little increase in size in comparison with normal breast epithelial cells, regular outlines, uniform nuclear chromatin, little variation in size; Grade 2: Cells larger than normal with open vesicular nuclei, visible nucleoli, and moderate variability in both size and shape; Grade 3: Vesicular nuclei, often with prominent nucleoli, exhibiting marked variation in size and shape, occasionally with very large and bizarre forms. | Baseline up to 30 months | 
| Percentage of Participants With Different Phenotypes of Breast Cancer Based on Lymphovascular Invasion | Breast cancer phenotypes were classified in to a) Luminal A: tissue samples that were ER+ and/or PR+, HER2-, and either histologic grade 1 or 2; b) Luminal B: tissue samples that were ER+ and/or PR+ and HER2+ or ER+ and/or PR+ and HER2- and histologic grade 3; c) HER2 enriched: tissue samples that were ER-, PR-, and HER2+; d) Triple negative: tissue samples that were negative for ER, PR, and HER2. Lymphovascular invasion is entering of breast cancer cells in to the lymph or vascular/blood channels. | Baseline up to 30 months | 
| Percentage of Participants With Different Phenotypes of Breast Cancer Based on ER Status | Breast cancer phenotypes were classified in to a) Luminal A: tissue samples that were ER+ and/or PR+, HER2-, and either histologic grade 1 or 2; b) Luminal B: tissue samples that were ER+ and/or PR+ and HER2+ or ER+ and/or PR+ and HER2- and histologic grade 3; c) HER2 enriched: tissue samples that were ER-, PR-, and HER2+; d) Triple negative: tissue samples that were negative for ER, PR, and HER2. | Baseline up to 30 months | 
| Percentage of Participants With Different Phenotypes of Breast Cancer Based on PR Status | Breast cancer phenotypes were classified in to a) Luminal A: tissue samples that were ER+ and/or PR+, HER2-, and either histologic grade 1 or 2; b) Luminal B: tissue samples that were ER+ and/or PR+ and HER2+ or ER+ and/or PR+ and HER2- and histologic grade 3; c) HER2 enriched: tissue samples that were ER-, PR-, and HER2+; d) Triple negative: tissue samples that were negative for ER, PR, and HER2. | Baseline up to 30 months | 
| Percentage of Participants With Different Phenotypes of Breast Cancer Based on HER2 Status | Breast cancer phenotypes were classified in to a) Luminal A: tissue samples that were ER+ and/or PR+, HER2-, and either histologic grade 1 or 2; b) Luminal B: tissue samples that were ER+ and/or PR+ and HER2+ or ER+ and/or PR+ and HER2- and histologic grade 3; c) HER2 enriched: tissue samples that were ER-, PR-, and HER2+; d) Triple negative: tissue samples that were negative for ER, PR, and HER2. | Baseline up to 30 months | 
| Percentage of Participants With Breast Cancer Phenotypes Among Different Hispanic Countries | Breast cancer phenotypes were classified in to a) Luminal A: tissue samples that were ER+ and/or PR+, HER2-, and either histologic grade 1 or 2; b) Luminal B: tissue samples that were ER+ and/or PR+ and HER2+ or ER+ and/or PR+ and HER2- and histologic grade 3; c) HER2 enriched: tissue samples that were ER-, PR-, and HER2+; d) Triple negative: tissue samples that were negative for ER, PR, and HER2. | Baseline up to 30 months |