Sydney student discovers critical flaw in global cancer research
Danielle Oste is currently completing her animal science degree.
From an early age, curiosity and a hunger for discovery fuelled the passion of animal science student Danielle Oste, a self-proclaimed 'maths and science girl', whose love of learning has been a constant motivation.
This eagerness for learning was recognised when she was selected to undertake a group research project as part of the Dalyell Scholars stream under the guidance of Professor Jennifer Byrne, from the School of Medical Sciences.
Group projects are a quintessential university experience. Some enjoy it and others don’t. For Danielle, this research project would lead to the discovery of phantom cell lines, throwing into question the legitimacy of hundreds of academic cancer research papers.
Cell lines are vital for studying cell function and disease responses. They are a group of cells that can be taken from tissue and grown in the lab for a long time while keeping the same basic traits and functions as the original cells. During the project, Danielle and her group uncovered several cell lines referenced in research papers that couldn’t be verified in Cellosaurus, a well-known cell line encyclopedia.
“If a paper stated that it used MCF7, a breast cancer cell line, we would then search for MCF7 in Cellosaurus to verify that it was indeed a breast cancer cell line,” said Danielle. “Through this process we came across five that just didn't come up in this database and at the time we were like ‘oh, that's a bit weird’.
“So, what started as this niggling weird thing in a group project assignment, pretty quickly grew into what was quite a scary discovery.”
Professor Jennifer Byrne is a cancer research specialst at the School of Medical Sciences
This discovery later saw Danielle invited to work with Professor Byrne to further investigate what the students initially uncovered. Together, they were able to identify 18 more phantom cell line names, several of which were referenced across hundreds of literary articles and couldn’t be found in the repositories that the articles claimed to have obtained the cell lines from.
“That's a little bit like someone saying, ‘I got these shoes from this particular shop’,” said Professor Byrne. “And then you go to the shop, and they don't have them. They were never sold or even in stock.”
Danielle and Professor Byrne's findings highlighted a bleak reality: much of genetic cancer research that they studied relied on cell lines that did not exist, making it unclear how the research was conducted. This can lead to incorrect interpretations of study results and potentially mislead future research.
I think that's when it really sunk in that this is bad, this is bad and it's probably the tip of an iceberg of a very big problem in the literature.
“I think that's when it really sunk in that this is bad and it's probably the tip of an iceberg of a very big problem in the literature,” said Danielle.
The prevalence of the problem isn’t lost on Danielle and Professor Byrne. They were shocked by the number of misspelt identifiers they found in the literature. More concerning is the difficulty of grasping the full extent of the problem; a single identifier can be misspelt in numerous ways through different combinations of letters and numbers.
Yet, as is often the case when faced with challenges, laughter can be the best medicine.
“At times we felt like we were going a bit crazy because these misspelt cell line identifiers can be quite hard to recognise so it was difficult work. But we were able to get through it by laughing quite a lot,” said Professor Byrne.
Danielle had the incredible opportunity to travel to Athens and present at a conference on research integrity.
The hard work paid off however, when Danielle became the lead author of a study highlighting problematic and contaminated cell lines in research papers published in the International Journal of Cancer.
The publication sparked important discussions within the scientific community about the need for stricter validation processes for cell line usage in research. Danielle also had the incredible opportunity to present her findings at a research integrity conference in Greece.
“She's just a delight to work with,” said Professor Byrne. “She's extremely smart, very efficient and just understood what we were doing right from the start. And I think it is particularly impressive that she's an undergraduate student.
“When we went to a conference together this year, I think everyone was assuming that she was doing a PhD.”
What's next?
The team is now looking for other research papers showing images of the cell lines. This would allow them to trace the images back to other sources and further understand the use of non-verifiable cell lines in the literature.
They are also trying to ensure non-verifiable cell lines are added to databases like Cellosaurus to warn researchers and create awareness of the problem. This is proving to be a challenging process as databases usually list only legitimate items. Despite the hard work Danielle is looking forward to what the future holds.
And she has some sage advice for her fellow classmates:
“As students, it’s crucial to remember that peer-reviewed journal articles are a solid standard—far better than random websites—but it's just as important to critically analyse what you're reading. Always ask, 'Does this make sense? Is it verifiable? Can I check these facts?’. There are a lot of obvious issues experts like Professor Byrne are uncovering, and, with a critical eye, you can spot them too.”
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