Dataset Information

Inherited Bone Marrow Failure Syndromes Study

ABSTRACT:

Background:

A prospective cohort of Inherited Bone Marrow Failure Syndrome (IBMFS) will provide new information regarding cancer rates and types in these disorders.
Mutations in IBMFS genes are relevant to carcinogenesis in sporadic cancers.
Patients with IBMFS who develop cancer differ in their genetic and/or environmental features from patients with IBMFS who do not develop cancer.
These cancer-prone families are well suited for cancer screening and prevention trials targeting those at increased genetic risk of cancer.
Carriers of IBMFS gene mutations are at increased risk of cancer.
The prototype disorder is Fanconi Anemia (FA); other IBMFS will also be studied.

Objectives:

To determine the types and incidence of specific cancers in patients with an IBMFS.
To investigate the relevance of IBMFS gene mutations in the carcinogenesis pathway of the sporadic counterparts of IBMFS-associated cancers.
To identify risk factors for IBMFS-related cancers in addition to the primary germline mutations.
To determine the risk of cancer in IBMFS carriers.

Design:

Natural history study, with questionnaires, clinical evaluations, clinical and research laboratory tests, review of medical records, cancer surveillance.
Primary endpoints are all cancers, solid tumors, and cancers specific to each type of IBMFS.
Secondary endpoints are markers of pre-malignant conditions, such as leukoplakia, serum or tissue evidence of carcinogenic viruses, and bone marrow morphologic myelodyplastic syndrome or cytogenetic clones.

PROVIDER: phs001481 | dbGaP |

SECONDARY ACCESSION(S): PRJNA417130PRJNA417131

REPOSITORIES: dbGaP

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Project description:The development of non-invasive primary cancer preventive measures in humans require a thorough understanding of the initial cancer-driving molecular mechanisms. High grade serous extra-uterine M llerian cancers (HGSEMC; formerly classified as ovarian/tubal/peritoneal cancer) present at a very late stage and less than 40% of women survive 5 years. Although the recent TCGA initiatives revealed key molecular changes in established cancers, very little is known about the initial molecular alterations in cancer development. Analysis of normal tissue at extensively high risk prior to the development of any microscopic alterations is critical. BRCA1/2 mutation carriers have an up to 30 40 fold increased risk to develop ovarian cancer, preferentially HGSEMC. Despite a plethora of evidence linking mutations in BRCA1 or BRCA2 to cancer development the core components such as organ specificity (i.e. to breast and Fallopian Tube) are still missing. The Fallopian Tube of BRCA mutation carriers offers a unique opportunity to study carcinogenesis because these cancers originate only from the distal (i.e. fimbrial) end of the Fallopian Tube (which is in close proximity to the ovary), and not from the proximal end (which is close to the uterus). The ovary which is in extreme close proximity to the fimbriae provides an excellent soil for cancer cells which are likely shed from the fimbriae and once the cancer has been discovered the big bulk of tumour is usually present on the ovary and hence the majority of HGSEMC are also referred to as ovarian cancer . To study the earliest steps of human carcinogenesis we performed epigenome-wide DNA methylation (DNAme) analyses (using the Illumina 450k DNA methylation bead-array assay assessing DNAme at ~480 000 CpG sites) in 215 microscopic normal Fallopian Tube samples of BRCA1/2 mutation carriers (n=56) and controls (n=59) who had their tubes/ovaries removed for prophylactic or other reasons, respectively (for 52 and 49 individuals respectively we analysed both fimbrial and proximal Fallopian Tubes). In order to adjust for any epigenetic effects which are not of immediate importance to the carcinogenic process, for each volunteer we analysed both the fimbrial (at risk) and the proximal (non at risk) portion of the tubes separately. Formalin fixed paraffin embedded (FFPE) tissue blocks were retrieved from UCL Biobank (NC09.13). Histopathological features of fimbrial and proximal section of Fallopian Tube from BRCA carriers and control cases were carefully examined. Cases negative for serous tubal intraepithelial carcinoma (STIC) lesions were chosen for DNA isolation to characterize pre-cancer epigenetic changes. For DNA isolation, a core of 3 x 0.6 mm was taken from each block representing fimbrial and proximal end of fallopian tubes from both BRCA carriers and matched control cases. The DNA was isolated using QIAamp(r) DNA FFPE Tissue Kit as per manufacturer's protocol with minor modifications (Dewaxing for 4 hours in xylene and proteinase digestion performed overnight, other procedures were as per the instructions). DNA was quantified using Nandrop and restored using the Infinium FFPE DNA Restore Kit and then 200 nanogram of DNA was bisulfite converted using the EZ DNA Methylation-Gold(tm) and subjected to methylation analysis on the Illumina Infinium Human Methylation450 BeadChip.

Dataset Information

Inherited Bone Marrow Failure Syndromes Study

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