(Q34267466)

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

15 February 2020

title

Prolonged drug selection of breast cancer cells and enrichment of cancer stem cell characteristics (English)

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

15 February 2020

main subject

neoplastic stem cells

1 reference

1 reference

1

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

15 February 2020

7

Michael M Gottesman

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

15 February 2020

author name string

Crystal D Salcido

2

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

15 February 2020

Jean-Pierre Gillet

3

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

15 February 2020

Chung-Pu Wu

4

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

15 February 2020

Jennifer M Fostel

5

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

15 February 2020

Melanie D Mumau

6

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

15 February 2020

Lyuba Varticovski

8

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

15 February 2020

Suresh V Ambudkar

9

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

15 February 2020

language of work or name

English

0 references

publication date

8 October 2010

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

Journal of the National Cancer Institute

15 February 2020

published in

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

15 February 2020

volume

102

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

15 February 2020

issue

21

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

15 February 2020

page(s)

1637-1652

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

Distinct expression levels and patterns of stem cell marker, aldehyde dehydrogenase isoform 1 (ALDH1), in human epithelial cancers

15 February 2020

cites work

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Single-marker identification of head and neck squamous cell carcinoma cancer stem cells with aldehyde dehydrogenase.

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Aldehyde dehydrogenase 1-positive cancer stem cells mediate metastasis and poor clinical outcome in inflammatory breast cancer

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Highly tumorigenic lung cancer CD133+ cells display stem-like features and are spared by cisplatin treatment

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Identification of selective inhibitors of cancer stem cells by high-throughput screening

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Residual breast cancers after conventional therapy display mesenchymal as well as tumor-initiating features

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

ABC transporters, drug resistance, and cancer stem cells

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Breast cancer cells expressing stem cell markers CD44+ CD24 lo are eliminated by Numb-1 peptide-activated T cells.

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Aldehyde dehydrogenase activity as a functional marker for lung cancer

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Drug-selected human lung cancer stem cells: cytokine network, tumorigenic and metastatic properties

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

HER2 regulates the mammary stem/progenitor cell population driving tumorigenesis and invasion.

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Melanoma stem cells: the dark seed of melanoma

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Intrinsic resistance of tumorigenic breast cancer cells to chemotherapy

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Mechanisms of Disease: cancer stem cells--targeting the evil twin

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Single-step doxorubicin-selected cancer cells overexpress the ABCG2 drug transporter through epigenetic changes.

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

ALDH1 is a marker of normal and malignant human mammary stem cells and a predictor of poor clinical outcome

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Human breast cancer cell lines contain stem-like cells that self-renew, give rise to phenotypically diverse progeny and survive chemotherapy

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

A human breast cell model of preinvasive to invasive transition.

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Brca1 breast tumors contain distinct CD44+/CD24- and CD133+ cells with cancer stem cell characteristics

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

ABC drug transporters as molecular targets for the prevention of multidrug resistance and drug-drug interactions.

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Cancer stem cells: implications for cancer treatment and prevention

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

The transcription factor snail mediates epithelial to mesenchymal transitions by repression of estrogen receptor-alpha

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Overexpression of glucosylceramide synthase in associated with multidrug resistance of leukemia cells

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Vimentin and epithelial-mesenchymal transition in human breast cancer--observations in vitro and in vivo.

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

The response of CD24(-/low)/CD44+ breast cancer-initiating cells to radiation

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

CD44+/CD24- breast cancer cells exhibit enhanced invasive properties: an early step necessary for metastasis

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Plasma membrane calcium ATPase (PMCA4): a housekeeper for RT-PCR relative quantification of polytopic membrane proteins

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Characterization of gene rearrangements leading to activation of MDR-1.

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Overexpression of tissue transglutaminase leads to constitutive activation of nuclear factor-kappaB in cancer cells: delineation of a novel pathway

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Selective expression of cholesterol metabolism genes in normal CD34+CD38- cells with a heterogeneous expression pattern in AML cells.

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

A case study in misidentification of cancer cell lines: MCF-7/AdrR cells (re-designated NCI/ADR-RES) are derived from OVCAR-8 human ovarian carcinoma cells

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Cancer stem cells: an old idea--a paradigm shift

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Anoikis and survival connections in the tumor microenvironment: is there a role in prostate cancer metastasis?

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Modulatory effects of plant phenols on human multidrug-resistance proteins 1, 4 and 5 (ABCC1, 4 and 5).

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Molecular requirements for epithelial-mesenchymal transition during tumor progression

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Isolation and in vitro propagation of tumorigenic breast cancer cells with stem/progenitor cell properties

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Characterization of cells with a high aldehyde dehydrogenase activity from cord blood and acute myeloid leukemia samples

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

RAD51, genomic stability, and tumorigenesis

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

A putative human breast stem cell population is enriched for steroid receptor-positive cells

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Role of human aldehyde dehydrogenases in endobiotic and xenobiotic metabolism.

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Twist, a master regulator of morphogenesis, plays an essential role in tumor metastasis

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Exploration, normalization, and summaries of high density oligonucleotide array probe level data

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Prospective identification of tumorigenic breast cancer cells

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

A comparison of normalization methods for high density oligonucleotide array data based on variance and bias

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Non-apoptotic Fas signaling.

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Human breast cancer MCF-7 cell line contains inherently drug-resistant subclones with distinct genotypic and phenotypic features.

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Multidrug resistance in cancer: role of ATP-dependent transporters

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Proteomic alterations of the variants of human aldehyde dehydrogenase isozymes correlate with hepatocellular carcinoma

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

The TNF-receptor-associated factor family: scaffold molecules for cytokine receptors, kinases and their regulators

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Overexpression of the ATP-binding cassette half-transporter, ABCG2 (Mxr/BCrp/ABCP1), in flavopiridol-resistant human breast cancer cells

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

An information-intensive approach to the molecular pharmacology of cancer.

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Cadherins in cancer: implications for invasion and metastasis

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Cadherin expression in carcinomas: role in the formation of cell junctions and the prevention of invasiveness

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Multidrug resistance-associated protein gene overexpression and reduced drug sensitivity of topoisomerase II in a human breast carcinoma MCF7 cell line selected for etoposide resistance

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Multiple drug-resistant human KB carcinoma cells independently selected for high-level resistance to colchicine, adriamycin, or vinblastine show changes in expression of specific proteins.

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Expression and activity of P-glycoprotein, a multidrug efflux pump, in human hematopoietic stem cells

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Effect of P-glycoprotein expression on sensitivity to hormones in MCF-7 human breast cancer cells

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

ALDH high adenoid cystic carcinoma cells display cancer stem cell properties and are responsible for mediating metastasis.

6 July 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Are stem-like cells responsible for resistance to therapy in breast cancer?

28 October 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Prognostic relevance of glucosylceramide synthase (GCS) expression in breast cancer

28 October 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Expression of CD133-1 and CD133-2 in ovarian cancer

28 October 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Overexpression of the low molecular weight cyclin E in transgenic mice induces metastatic mammary carcinomas through the disruption of the ARF-p53 pathway.

28 October 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Multidrug-resistant MCF-7 cells: an identity crisis?

28 October 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Acquired mutations in the MXR/BCRP/ABCP gene alter substrate specificity in MXR/BCRP/ABCP-overexpressing cells.

28 October 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Uncertain identity of doxorubicin-resistant MCF-7 cell lines expressing mutated p53.

28 October 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

High levels of transglutaminase expression in doxorubicin-resistant human breast carcinoma cells

28 October 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

A 190-kilodalton protein overexpressed in non-P-glycoprotein-containing multidrug-resistant cells and its relationship to the MRP gene.

28 October 2018

1 reference

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&retmode=json&id=2970576

Effect of estrogens and antiestrogens on growth of human breast cancer cells in athymic nude mice

28 October 2018

1 reference

PubMed

https://pubmed.ncbi.nlm.nih.gov/20935265

inferred from PubMed ID database lookup

12 December 2020

based on heuristic

MCF-7 human breast carcinomas in nude mice as a model for evaluating aromatase inhibitors

1 reference

PubMed

https://pubmed.ncbi.nlm.nih.gov/20935265

inferred from PubMed ID database lookup

12 December 2020

based on heuristic

Identifiers

DOI

10.1093/JNCI/DJQ361

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

15 February 2020

1 reference

https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=EXT_ID:20935265%20AND%20SRC:MED&resulttype=core&format=json

15 February 2020

PubMed publication ID

20935265

1 reference