Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Gene expression profiling of human breast cancer during pregnancy

ABSTRACT: Using a dataset of 54 pregnant and 113 age/stage-matched non-pregnant breast cancer patients with complete clinical and survival data; we evaluated the pattern of hot spot somatic mutations and performed transcriptomic profiling using Sequenom® and Affymetrix®, respectively. Breast cancer molecular subtypes were defined using PAM50 and 3-Gene classifiers. We performed Gene set enrichment analysis (GSEA) to evaluate pathways associated with diagnosis during pregnancy. We investigated the differential expression of cancer-related genes and published gene sets according to pregnancy. We finally investigated genes associated with disease-free survival. We identified 65 patients who were diagnosed with breast cancer during pregnancy. Moreover, for each case, two breast cancer patients who were not diagnosed during pregnancy or lactation, but who were matched according to age (±2 years), tumors size, nodal status, year of surgery (±2 years) and whether neoadjuvant chemotherapy was received were selected. Messenger RNA from tumor tissue has been extracted and hybridized on Affymetrix microarrays. However, due to experimental issues, 54 pregnant and 113 non-pregnant patients were remaining and used in our study.

ORGANISM(S): Homo sapiens

SUBMITTER: Sylvain Brohée

PROVIDER: E-GEOD-53031 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Biology of breast cancer during pregnancy using genomic profiling.

Azim Hatem A HA Brohée Sylvain S Peccatori Fedro A FA Desmedt Christine C Loi Sherene S Lambrechts Diether D Dell'Orto Patrizia P Majjaj Samira S Jose Vinu V Rotmensz Nicole N Ignatiadis Michail M Pruneri Giancarlo G Piccart Martine M Viale Giuseppe G Sotiriou Christos C

Endocrine-related cancer 20140513 4

Breast cancer during pregnancy is rare and is associated with relatively poor prognosis. No information is available on its biological features at the genomic level. Using a dataset of 54 pregnant and 113 non-pregnant breast cancer patients, we evaluated the pattern of hot spot somatic mutations and did transcriptomic profiling using Sequenom and Affymetrix respectively. We performed gene set enrichment analysis to evaluate the pathways associated with diagnosis during pregnancy. We also evaluat ...[more]

PMID: 24825746

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Project description:Rationale: Maternal immune responses can promote allergy development in offspring. Pilot data show that neonates of mother mice exposed during pregnancy to air pollution particles have increased allergic susceptibility. Objective: We investigated whether inflammatory response to titanium dioxide (TiO2) particles earlier considered immunologically âinertâ is enhanced during pregnancy. Methods: Pregnant BALB/c mice (or non-pregnant controls) received particle suspensions intranasally at day 14 of pregnancy. Lung inflammatory responses were evaluated 19 and 48 h after exposure. Results: Pregnant mice showed robust and persistent acute inflammatory responses after exposure to TiO2, while non-pregnant females had the expected minimal responses. Genomic profiling identified genes differentially expressed in pregnant lungs exposed to TiO2. Neonates of mothers exposed to TiO2 (but not PBS) developed increased susceptibility to allergens. Conclusion: Pregnancy enhances lung inflammatory responses to otherwise relatively innocuous inert particles. Experiment Overall Design: To test whether pregnancy alters the normally minimal inflammatory response to âinertâ particles, we have administered TiO2 and DEP suspensions (50 ug/mouse) or PBS solution by intranasal insufflation to normal or pregnant E14 mice (see Figure 1B). The mice were subjected to pathologic analysis 19 or 48 hrs later. Experiment Overall Design: Respirable-size TiO2 particles were generously provided by Dr. Ian Gilmour (US EPA). Particle samples were baked at 165 0C for 3 h to eliminate endotoxin, aliquoted and stored frozen at â 80 0C. Particle suspensions (50 ug in 50 uL) or PBS solution (vehicle) were administered by single intranasal insufflation of pregnant or normal Balb/c mice under light halothane anesthesia Experiment Overall Design: Total lung RNA extraction and isolation was performed 19 hrs after exposure using a Qiagen RNAeasy Mini kit according to manufacturerâs instructions (Qiagen, Valencia, CA). RNA purity and quality were analyzed by Agilent Bioanalyzer 2100 scan. The hybridization was carried out at the Harvard Partners Genomic Center Microarray facility (Cambridge, MA) using the Affymetrix GeneChip Â® platform and Affymetrix mouse 430 2.0 chips (Affymetrix, Santa Clara, CA). Experiment Overall Design: 4 samples were analyzed in each of 4 groups: Normal PBS, Normal TiO2, Pregnant PBS and Pregnant TiO2, for a total of 16 samples.

Dataset Information

Gene expression profiling of human breast cancer during pregnancy

Publications

Biology of breast cancer during pregnancy using genomic profiling.

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