Evidence map›Paper›PMID 27267855›Full record

ArticleClinical cancer research : an official journal of the American Association for Cancer Research2016

CD44 Expression Level and Isoform Contributes to Pancreatic Cancer Cell Plasticity, Invasiveness, and Response to Therapy.

Shujie Zhao, Chen Chen, Katherine Chang, Anand Karnad, Jaishree Jagirdar, Addanki P Kumar, James W Freeman

Abstract read
In one paragraph

Article in Clinical cancer research : an official journal of the American Association for Cancer Research, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 106 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
106citing papers in PubMed, 1 pooled it
5.4field-weighted citation impact, top 3% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

106 citing papers in PubMed, 1 synthesis or guideline pooled it, 171 citations in OpenAlex.

  1. Pooled it
  2. Review
  3. Article
  4. Review
  5. Review
  6. Article
  7. Catching pancreatic cancer early: Are we there yet?Journal of the National Cancer Center · 2026
    Review
  8. Article
  9. Article
  10. Review
  11. Advanced Human Immune Cell-Organoid Co-Cultures for Functional Testing of Cancer Nanovaccines.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2026
    Article
  12. Article
  13. Review
  14. Review
  15. Review
  16. RSC advances · 2025
    Article
  17. Article
  18. Review
  19. Article
  20. Review

46 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors at 1 institution in 1 country.

Shujie ZhaoDepartment of Medicine, Division of Medical Oncology, University of Texas Health Science Center at San Antonio, San Antonio, Texas.
Chen ChenDepartment of Medicine, Division of Medical Oncology, University of Texas Health Science Center at San Antonio, San Antonio, Texas.
Katherine ChangDepartment of Medicine, Division of Medical Oncology, University of Texas Health Science Center at San Antonio, San Antonio, Texas.
Anand KarnadDepartment of Medicine, Division of Medical Oncology, University of Texas Health Science Center at San Antonio, San Antonio, Texas.
Jaishree JagirdarDepartment of Pathology, University of Texas Health Science Center at San Antonio, San Antonio, Texas.
Addanki P KumarDepartment of Urology, University of Texas Health Science Center at San Antonio, San Antonio, Texas.
James W FreemanDepartment of Medicine, Division of Medical Oncology, University of Texas Health Science Center at San Antonio, San Antonio, Texas. freemanjw@uthscsa.edu.
The University of Texas Health Science Center at San Antonio · US

Funding

TISSUE CULTURE---COREP30CA054174 · NCI · UNIVERSITY OF TEXAS HLTH SCIENCE CENTER · PI Lei Zheng · 1991 to 2026
$59.1M
TGF-B RECEPTOR ALTERATIONS AND PANCREAS CANCERR01CA069122 · NCI · UNIVERSITY OF TEXAS HLTH SCIENCE CENTER · PI FREEMAN, JAMES W. · 1997 to 2014
$3.2M
Role of CD44 in adaptive plasticity of pancreatic cancerI01BX002962 · VA · SOUTH TEXAS VETERANS HEALTH CARE SYSTEM · PI FREEMAN, JAMES W. · 2015 to 2018
–
BLRD VA I01 BX002962NCI NIH HHS P30 CA054174NCI NIH HHS R01 CA069122
6 · The paper itself

Abstract

purposeA subpopulation of pancreatic ductal adenocarcinoma (PDAC) cells is thought to be inherently resistant to chemotherapy or to give rise to tumor cells that become resistant during treatment. Here we determined the role of CD44 expression and its isoforms as a marker and potential target for tumor cells that give rise to invasive and gemcitabine-resistant tumors. EXPERIMENTAL

designRT-PCR, Western blotting, and DNA sequencing was used to determine CD44 isoform and expression levels. Flow cytometry was used to sort cells on the basis of their CD44 expression level. CD44 expression was knocked down using shRNA. Tumorigenic properties were determined by clonogenic and Matrigel assays, IHC, tumor growth in vivo using luciferase imaging and by tumor weight.

resultsWe identified an invasive cell population that gives rise to gemcitabine-resistant tumors. These cancer cells express a high level of CD44 standard isoform and have an EMT phenotype (CD44s/EMT). In vivo, CD44s/EMT engraft and expand rapidly and give rise to tumors that express high levels of CD44 isoforms that contain multiple exon variants. CD44

conclusionsPDAC cells expressing high levels of CD44s with a mesenchymal-like phenotype were highly invasive and developed gemcitabine resistance in vivo Thus, initial targeting CD44 or reversing the CD44

Indexed as

Carcinoma, Pancreatic DuctalCell Line, TumorCell MovementDeoxycytidineGemcitabineGene Expression Regulation, NeoplasticHumansHyaluronan ReceptorsPancreatic NeoplasmsProtein IsoformsRNA, Small InterferingCD44 protein, humanDeoxycytidineGemcitabineHyaluronan ReceptorsProtein IsoformsRNA, Small Interfering

Identifiers

PMID27267855
PMCPMC5143222
OpenAlexW2416315820

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.