USP Brazil Study Identifies Periostin: Key Protein Driving Pancreatic Cancer Nerve Invasion

Understanding Pancreatic Cancer's Deadly Spread

Pancreatic cancer remains one of the most formidable challenges in oncology, characterized by its rapid progression and poor prognosis. In Brazil, the National Cancer Institute (INCA) estimates around 11,000 new cases annually, with approximately 13,000 deaths, highlighting a mortality rate that nearly matches incidence. 71 70 Globally, the World Health Organization reports over 510,000 new diagnoses and a similar number of fatalities each year. Only about 10% of patients survive five years post-diagnosis, largely due to late detection and aggressive metastasis mechanisms like perineural invasion (PNI), where tumor cells infiltrate nerves to facilitate spread. 59

This invasion occurs in up to 90% of pancreatic adenocarcinoma cases—the most common subtype, accounting for 90% of all pancreatic cancers—and often in over half of early-stage tumors, discovered only during surgery. 71 Recent Brazilian research from the University of São Paulo (USP) has pinpointed a critical player in this process: the protein periostin, produced by pancreatic stellate cells, which remodels the extracellular matrix (ECM) to create pathways for tumor invasion.

The study, conducted at USP's Center for Research on Inflammatory Diseases (CRID), underscores Brazil's growing role in global cancer research, potentially opening doors for precision medicine therapies. For academics and researchers eyeing opportunities in oncology, platforms like higher-ed research jobs list positions at leading Brazilian institutions such as USP.

🔬 The Science Behind Perineural Invasion in Pancreatic Cancer

Perineural invasion (PNI) is a hallmark of pancreatic ductal adenocarcinoma (PDAC), where cancer cells migrate along nerve sheaths, evading immune detection and promoting distant metastases. This process step-by-step involves: tumor cells signaling nearby stromal cells, inducing a desmoplastic reaction—intense fibrosis that stiffens tissue—and exploiting nerves as "highways" for dissemination.

The dense, inflamed microenvironment not only shields tumors from chemotherapeutics and immunotherapies but also causes severe pain, a common symptom driving late diagnoses. Helder Nakaya, principal investigator and professor at USP's School of Pharmaceutical Sciences, notes, "Periostin participates in this remodeling, paving the way for tumor cells to invade." 70

PNI's prognostic weight is significant; its presence correlates with reduced survival and higher recurrence rates, making early targeting essential.

Breakthrough Findings from the USP-Led Study

Published in Molecular and Cellular Endocrinology on January 22, 2026, the study titled "Periostin-positive stellate cells associated with perineural invasion in pancreatic adenocarcinoma" analyzed 24 pancreatic cancer samples using advanced spatial transcriptomics. 71 This technique maps gene expression at cellular resolution, revealing how stellate cells—normally quiescent fibroblasts—activate to secrete periostin.

• Stellate cells reprogram under tumor influence, producing periostin that alters ECM composition.
• This remodeling softens barriers around nerves, enabling tumor infiltration as early as initial stages.
• High periostin levels directly associate with PNI sites, confirmed across samples.

First author Carlos Alberto de Carvalho Fraga and team at CRID (FMRP-USP) integrated multi-omics data, uncovering novel interactions overlooked in prior analyses. Oncologist Pedro Luiz Serrano Uson Junior explains, "PNI is a sign that cancer cells have gained mobility... facilitating metastases." 70

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Periostin: The Key Protein in Tumor-Stroma Crosstalk

Periostin (POSTN), a matricellular protein, is upregulated in stellate cells within the tumor stroma. It binds integrins on cancer cells, promoting migration and survival signaling via pathways like FAK/PI3K. In PDAC, this creates a vicious cycle: tumors induce periostin secretion, which in turn supports invasion.

Unlike direct tumor mutations, this stromal dependency offers a therapeutic window. Blocking periostin could disrupt PNI without harming healthy tissue. Ongoing trials in breast and colorectal cancers test anti-periostin antibodies, paving the way for pancreatic applications. 71

Brazilian institutions like USP are at the forefront, fostering collaborations that attract international talent. Check Brazil university jobs for faculty and postdoc roles.

Implications for Brazilian Cancer Research and Treatment

This USP discovery has profound implications for Brazil, where pancreatic cancer burdens the public health system via SUS (Unified Health System). Targeting periostin could improve outcomes in high-incidence regions like the Southeast, home to USP.

• Precision diagnostics: Biomarker assays for periostin to stratify high-PNI risk patients.
• Novel therapies: Stellate cell depletion or periostin inhibitors combined with chemotherapy.
• Clinical trials: Potential for FAPESP-funded studies at Brazilian centers.

"If we can develop antibodies... we'll have tools to prevent invasive capacity early," says Uson Junior. 70 Read the full FAPESP report.

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Brazil's Higher Education Role in Oncology Advances

Universities like USP, with its CRID and FCF, exemplify Brazil's research prowess. FAPESP funding supports cutting-edge work, producing publications in top journals and training next-gen scientists. Ribeirão Preto's FMRP-USP hosts multidisciplinary teams blending bioinformatics, pathology, and clinical oncology.

Einstein Hospital's involvement highlights public-private synergies. Such ecosystems create jobs for PhDs in clinical research jobs and beyond.

Challenges and Future Outlook in Pancreatic Cancer Research

Despite progress, challenges persist: PDAC's heterogeneity, diagnostic delays (often stage III/IV at diagnosis), and therapy resistance. Future strategies include:

Nakaya emphasizes, "Precision medicine is advancing... based on molecular changes." Brazilian trials could lead globally, with INCA coordinating efforts.

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Career Opportunities in Brazilian Cancer Research

This study spotlights demand for experts in transcriptomics, oncology, and bioinformatics at Brazilian universities. USP and peers like UNICAMP offer lecturer jobs, postdocs, and faculty positions. FAPESP grants fuel innovation, attracting talent amid rising cancer burdens.

• Postdoctoral fellowships in molecular oncology.
• Research assistant roles in spatial biology.
• Clinical trials coordinators at university hospitals.

Platforms like university jobs connect professionals to these opportunities.

Conclusion: A Hopeful Path Forward

The USP periostin discovery heralds a new era for pancreatic cancer research in Brazil, promising targeted therapies against PNI. As precision oncology evolves, collaborations between universities, hospitals, and funders like FAPESP will drive breakthroughs. Aspiring researchers, rate your professors at Rate My Professor, explore higher-ed jobs, and seek career advice. Stay informed and engaged in this vital field.

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