Abstract
The fight against rare cancers faces myriad challenges, including missed or wrong diagnoses, lack of information and diagnostic tools, too few samples and too little funding. Yet many advances in cancer biology, such as the realization that there are tumour suppressor genes, have come from studying well-defined, albeit rare, cancers. Fibrolamellar hepatocellular carcinoma (FLC), a typically lethal liver cancer, mainly affects adolescents and young adults. FLC is both rare, 1 in 5 million, and problematic to diagnose. From the paucity of data, it was not known whether FLC was one cancer or a collection with similar phenotypes, or whether it was genetically inherited or the result of a somatic mutation. A personal journey through a decade of work reveals answers to these questions and a road map of steps and missteps in our fight against a rare cancer.
This is a preview of subscription content, access via your institution
Access options
Access Nature and 54 other Nature Portfolio journals
Get Nature+, our best-value online-access subscription
$32.99 / 30 days
cancel any time
Subscribe to this journal
Receive 12 print issues and online access
$259.00 per year
only $21.58 per issue
Buy this article
- Purchase on SpringerLink
- Instant access to the full article PDF.
USD 39.95
Prices may be subject to local taxes which are calculated during checkout

Similar content being viewed by others
Change history
20 April 2023
A Correction to this paper has been published: https://doi.org/10.1038/s41568-023-00575-5
References
Pinna, A. D. et al. Treatment of fibrolamellar hepatoma with subtotal hepatectomy or transplantation. Hepatology 26, 877–883 (1997).
Starzl, T. E. et al. Treatment of fibrolamellar hepatoma with partial or total hepatectomy and transplantation of the liver. Surg. Gynecol. Obstet. 162, 145–148 (1986).
Moreno-Luna, L. E. et al. Clinical and pathologic factors associated with survival in young adult patients with fibrolamellar hepatocarcinoma. BMC Cancer 5, 142 (2005).
Yamashita, S. et al. Prognosis of fibrolamellar carcinoma compared to non-cirrhotic conventional hepatocellular carcinoma. J. Gastrointest. Surg. 20, 1725–1731 (2016).
El-Serag, H. B. & Davila, J. A. Is fibrolamellar carcinoma different from hepatocellular carcinoma? A US population-based study. Hepatology 39, 798–803 (2004).
Simon, S. M. Gunter Blobel (1936–2018). Nature 556, 32 (2018).
Tommasini-Ghelfi, S. et al. Cancer-associated mutation and beyond: the emerging biology of isocitrate dehydrogenases in human disease. Sci. Adv. 5, eaaw4543 (2019).
Knudson, A. G. Jr. Mutation and cancer: statistical study of retinoblastoma. Proc. Natl Acad. Sci. USA 68, 820–823 (1971).
Friend, S. H. et al. A human DNA segment with properties of the gene that predisposes to retinoblastoma and osteosarcoma. Nature 323, 643–646 (1986).
Gatta, G. et al. Rare cancers are not so rare: the rare cancer burden in Europe. Eur. J. Cancer 47, 2493–2511 (2011).
Simon, J. S., Botero, S. & Simon, S. M. Sequencing the peripheral blood B and T cell repertoire — quantifying robustness and limitations. J. Immunol. Methods 463, 137–147 (2018).
Rich, B. S. et al. Endogenous antibodies for tumor detection. Sci. Rep. 4, 5088 (2014).
Simon, E. P. et al. Transcriptomic characterization of fibrolamellar hepatocellular carcinoma. Proc. Natl Acad. Sci. USA 112, E5916–E5925 (2015).
Farber, B. A. et al. Non coding RNA analysis in fibrolamellar hepatocellular carcinoma. Oncotarget 9, 10211–10227 (2018).
Anders, S. & Huber, W. Differential expression analysis for sequence count data. Genome Biol. 11, R106 (2010).
Darcy, D. G. et al. The genomic landscape of fibrolamellar hepatocellular carcinoma: whole genome sequencing of ten patients. Oncotarget 6, 755–770 (2015).
Bemmo, A. et al. Exon-level transcriptome profiling in murine breast cancer reveals splicing changes specific to tumors with different metastatic abilities. PLoS ONE 5, e11981 (2010).
Honeyman, J. N. et al. Detection of a recurrent DNAJB1–PRKACA chimeric transcript in fibrolamellar hepatocellular carcinoma. Science 343, 1010–1014 (2014).
Cohen, P., Cross, D. & Janne, P. A. Kinase drug discovery 20 years after imatinib: progress and future directions. Nat. Rev. Drug Discov. 20, 551–569 (2021).
Graham, R. P. et al. DNAJB1–PRKACA is specific for fibrolamellar carcinoma. Mod. Pathol. 28, 822–829 (2015).
Xu, L. et al. Genomic analysis of fibrolamellar hepatocellular carcinoma. Hum. Mol. Genet. 24, 50–63 (2015).
Kastenhuber, E. R. et al. DNAJB1–PRKACA fusion kinase interacts with β-catenin and the liver regenerative response to drive fibrolamellar hepatocellular carcinoma. Proc. Natl Acad. Sci. USA 114, 13076–13084 (2017).
Engelholm, L. H. et al. CRISPR/Cas9 engineering of adult mouse liver demonstrates that the Dnajb1–Prkaca gene fusion is sufficient to induce tumors resembling fibrolamellar hepatocellular carcinoma. Gastroenterology 153, 1662–1673 (2017).
Tomasini, M. D. et al. Conformational landscape of the PRKACA–DNAJB1 chimeric kinase, the driver for fibrolamellar hepatocellular carcinoma. Sci. Rep. 8, 720 (2018).
Cao, B. et al. Structures of the PKA RIα holoenzyme with the FLHCC driver J-PKAcα or wild-type PKAcα. Structure 27, 816–828.e4 (2019).
Yarchoan, M., Hopkins, A. & Jaffee, E. M. Tumor mutational burden and response rate to PD-1 inhibition. N. Engl. J. Med. 377, 2500–2501 (2017).
Narayan, N. J. C. et al. Human liver organoids for disease modeling of fibrolamellar carcinoma. Stem Cell Rep. 17, 1874–1888 (2022).
Saltsman, J. A. et al. A human organoid model of aggressive hepatoblastoma for disease modeling and drug testing. Cancers 12, 2668 (2020).
Lalazar, G. et al. Identification of novel therapeutic targets for fibrolamellar carcinoma using patient-derived xenografts and direct-from-patient screening. Cancer Discov. 11, 2544–2563 (2021).
Shebl, B. et al. Targeting BCL-XL in fibrolamellar hepatocellular carcinoma. JCI Insight 7, e161820 (2022).
Ando, Y. et al. UGT1A1 genotypes and glucuronidation of SN-38, the active metabolite of irinotecan. Ann. Oncol. 9, 845–847 (1998).
Iyer, L. et al. Genetic predisposition to the metabolism of irinotecan (CPT-11). Role of uridine diphosphate glucuronosyltransferase isoform 1A1 in the glucuronidation of its active metabolite (SN-38) in human liver microsomes. J. Clin. Invest. 101, 847–854 (1998).
Oguri, T. et al. UGT1A10 is responsible for SN-38 glucuronidation and its expression in human lung cancers. Anticancer Res. 24, 2893–2896 (2004).
Sakamoto, K. M. et al. Protacs: chimeric molecules that target proteins to the Skp1–Cullin–F box complex for ubiquitination and degradation. Proc. Natl Acad. Sci. USA 98, 8554–8559 (2001).
Khan, S. et al. A selective BCL-XL PROTAC degrader achieves safe and potent antitumor activity. Nat. Med. 25, 1938–1947 (2019).
Neumayer, C. et al. Oncogenic addiction of fibrolamellar hepatocellular carcinoma to the fusion kinase DNAJB1–PRKACA. Clin. Cancer Res. 29, 271–278 (2022).
Felsher, D. W. Oncogene addiction versus oncogene amnesia: perhaps more than just a bad habit? Cancer Res. 68, 3081–3086; discussion 68, 3086 (2008).
Weinstein, I. B. & Joe, A. Oncogene addiction. Cancer Res. 68, 3077–3080; discussion 68, 3080 (2008).
Ananthakrishnan, A., Gogineni, V. & Saeian, K. Epidemiology of primary and secondary liver cancers. Semin. Interv. Radiol. 23, 47–63 (2006).
Lalazar, G. & Simon, S. M. Fibrolamellar carcinoma: recent advances and unresolved questions on the molecular mechanisms. Semin. Liver Dis. 38, 51–59 (2018).
Berkovitz, A. et al. Clinical and demographic predictors of survival for fibrolamellar carcinoma patients—a patient community registry-based study. Hepatol. Commun. 6, 3539–3549 (2022).
Ostendorf, B. N. et al. Common germline variants of the human APOE gene modulate melanoma progression and survival. Nat. Med. 26, 1048–1053 (2020).
Chen, K. Y. et al. Clinical outcomes in fibrolamellar hepatocellular carcinoma treated with immune checkpoint inhibitors. Cancers 14, 5347 (2022).
Hakvoort, T. B. et al. Pivotal role of glutamine synthetase in ammonia detoxification. Hepatology 65, 281–293 (2017).
Surjan, R. C., Dos Santos, E. S., Basseres, T., Makdissi, F. F. & Machado, M. A. A proposed physiopathological pathway to hyperammonemic encephalopathy in a non-cirrhotic patient with fibrolamellar hepatocellular carcinoma without ornithine transcarbamylase (OTC) mutation. Am. J. Case Rep. 18, 234–241 (2017).
Bauer, J. et al. The oncogenic fusion protein DNAJB1–PRKACA can be specifically targeted by peptide-based immunotherapy in fibrolamellar hepatocellular carcinoma. Nat. Commun. 13, 6401 (2022).
Callaway, E. & Ledford, H. Virologists who discovered hepatitis C win medicine Nobel. Nature 586, 348 (2020).
Krammer, F. SARS-CoV-2 vaccines in development. Nature 586, 516–527 (2020).
Wolchok, J. Putting the immunologic brakes on cancer. Cell 175, 1452–1454 (2018).
Melenhorst, J. J. et al. Decade-long leukaemia remissions with persistence of CD4+ CAR T cells. Nature 602, 503–509 (2022).
1000 Genomes Project Consortium. et al. A map of human genome variation from population-scale sequencing. Nature 467, 1061–1073 (2010).
Barker, K. & Jarasz, O. Online misogyny: a challenge for digital feminism. J. Int. Aff. 72, 95–114 (2019).
Lorenz, T. & Browning, K. Dozens of women in gaming speak out about sexism and harassment. New York Times https://www.nytimes.com/2020/06/23/style/women-gaming-streaming-harassment-sexism-twitch.html (2020).
Bennett, C. F. Therapeutic antisense oligonucleotides are coming of age. Annu. Rev. Med. 70, 307–321 (2019).
Edmondson, H. A. Differential diagnosis of tumors and tumor-like lesions of liver in infancy and childhood. AMA J. Dis. Child. 91, 168–186 (1956).
Craig, J. R., Peters, R. L., Edmondson, H. A. & Omata, M. Fibrolamellar carcinoma of the liver: a tumor of adolescents and young adults with distinctive clinico-pathologic features. Cancer 46, 372–379 (1980).
Malouf, G. et al. Is histological diagnosis of primary liver carcinomas with fibrous stroma reproducible among experts? J. Clin. Pathol. 62, 519–524 (2009).
Abdul-Al, H. M., Wang, G., Makhlouf, H. R. & Goodman, Z. D. Fibrolamellar hepatocellular carcinoma: an immunohistochemical comparison with conventional hepatocellular carcinoma. Int. J. Surg. Pathol. 18, 313–318 (2010).
Ross, H. M. et al. Fibrolamellar carcinomas are positive for CD68. Mod. Pathol. 24, 390–395 (2011).
Torbenson, M. Fibrolamellar carcinoma: 2012 update. Scientifica 2012, 743790 (2012).
Graham, R. P. et al. Fibrolamellar carcinoma in the Carney complex: PRKAR1A loss instead of the classic DNAJB1–PRKACA fusion. Hepatology 68, 1441–1447 (2018).
Kirschner, L. S. et al. Mutations of the gene encoding the protein kinase A type Iα regulatory subunit in patients with the Carney complex. Nat. Genet. 26, 89–92 (2000).
Hirsch, T.Z. et al. BAP1 mutations define a homogeneous subgroup of hepatocellular carcinoma with fibrolamellar-like features and activated PKA. J. Hepatol. 72, 924–936 (2020).
Singhi, A. D. et al. Recurrent rearrangements in PRKACA and PRKACB in intraductal oncocytic papillary neoplasms of the pancreas and bile duct. Gastroenterology 158, 573–582.e2 (2020).
Vyas, M. et al. DNAJB1–PRKACA fusions occur in oncocytic pancreatic and biliary neoplasms and are not specific for fibrolamellar hepatocellular carcinoma. Mod. Pathol. 33, 648–656 (2020).
Fritz, A.G. et al. (eds) International Classification of Diseases for Oncology: ICD-O (World Health Organization, 2013).
O’Neill, A. F. et al. Fibrolamellar carcinoma: an entity all its own. Curr. Probl. Cancer 45, 100770 (2021).
Acknowledgements
The author thanks the fibrolamellar community for their commitment to defeat this beast. The author also thanks all members of the laboratory who have been working together as an incredible team, backing each other up on every step. Additionally, the author thanks colleagues around the world who have so generously given their time and thoughts.
Author information
Authors and Affiliations
Contributions
The author handled all aspects of the article.
Corresponding author
Ethics declarations
Competing interests
The author declares no competing interests.
Peer review
Peer review information
Nature Reviews Cancer thanks the anonymous reviewers for their contribution to the peer review of this work.
Additional information
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Related links
B+ Foundation: https://www.bepositive.org/
Bear Necessities: https://bearnecessities.org/about-bn/
Cancer survivor’s brilliant YouTube idea: https://www.today.com/video/cancer-survivors-brilliant-youtube-idea-228752963974
Fibrolamellar Cancer Foundation: https://fibrofoundation.org/about-fibro/
Fibrolamellar Liver Cancer Research: https://youtu.be/Y5lkp_uK9Ww
Fibrolamellar Registry: http://fibroregistry.org
Neucrue Cancer Fight: https://www.neucruecancerfight.org/
Precision Medicine Initiative: https://www.youtube.com/watch?v=qHD-_NYOcVA
Richard Lounsbery Foundation: https://www.rlounsbery.org/
Solving Kids’ Cancer: https://solvingkidscancer.org/
The Rally Foundation: https://rallyfoundation.org/
The Sohn Conference: https://www.sohnconference.org/
The White House Science Fair: https://youtu.be/q0TYR-MxC3I
Truth365: https://www.thetruth365.org/
Rights and permissions
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
About this article
Cite this article
Simon, S.M. Fighting rare cancers: lessons from fibrolamellar hepatocellular carcinoma. Nat Rev Cancer 23, 335–346 (2023). https://doi.org/10.1038/s41568-023-00554-w
Accepted:
Published:
Version of record:
Issue date:
DOI: https://doi.org/10.1038/s41568-023-00554-w
This article is cited by
-
Precision models in hepatocellular carcinoma
Nature Reviews Gastroenterology & Hepatology (2025)
-
Exploring the association between chemotherapy and prognosis among patients less than 50 years old with hepatocellular carcinoma: a retrospective cohort study based on the SEER database
Discover Oncology (2025)
-
Calpain 2 promotes Lenvatinib resistance and cancer stem cell traits via both proteolysis-dependent and independent approach in hepatocellular carcinoma
Molecular Biomedicine (2024)
-
Liver cancer multiomics reveals diverse protein kinase A disruptions convergently produce fibrolamellar hepatocellular carcinoma
Nature Communications (2024)
-
Transistor-based immunosensor using AuNPs-Ab2-HRP enzyme nanoprobe for the detection of antigen biomarker in human blood
Analytical and Bioanalytical Chemistry (2024)


