EARLY DETECTION of HPV-Related Head and Neck Cancers with a Saliva Test

Wang and colleagues reported in Journal of Molecular Diagnostics a method analyzing saliva for an oropharyngeal, mouth and throat, cancer subtype involving human papillomavirus type 16 (HPV-16) using acoustofluidics . It detected oropharyngeal cancer in saliva in % 40 of tested patients and % 80 with confirmed disease. Worldwide incidence is approximately 115 thousand new cases annually. In Western countries, increasing HPV-associated cancer incidence, especially in younger patients, makes it one of the fastest-rising cancers cancers. Developing screening to improve early detection and outcomes is very important. Duke University Mechanical Engineering and Materials Science lead researcher Tony Jun Huang, “Considering these factors, successfully detecting HPV from salivary exosomes isolated by our accordion fluid platform offers advantages including early detection, risk assessment, and screening.” It may also help predict which head and neck patients respond well to radiation therapy may be predicted to respond well, or whose cancer may follow a milder course, with the help of this technique.

Acoustofluidics

Exosomesare cell-derived microparticles secreted into fluids, containing DNA, RNA, and proteins. Believed to communicate between cells, their numbers rise with various cancers. Acoustofluidics combines acoustics, sound waves, and microfluidics in an advanced technology. A small chip analyzes liquid samples, isolating salivary exosomes by removing unwanted size-dependent particles and leaving concentrated, exosome-rich samples for easier tumor biomarker detection.

Figure Explanation: Device schematic and mechanism.

A: Device for salivary exosome separation, with two modules using 20 MHz and 40 MHz surface acoustic waves to separate micrometer and micrometer particles.

B: Optical image of the integrated device, with a penny for scale.

C: Size-based separation occurs in each module. Larger particles enter a sheath flow under acoustic radiation force (Fr) from a surface acoustic wave field and fluid drag (Fd), while smaller ones remain in the primary sample stream. PBS: phosphate-buffered saline.

Results

Researchers analyzed saliva from 10 HPV-associated oropharyngeal cancer patients using conventional methods. Combined with droplet cascade polymerase chain reaction, the technique identified in % 80 of cases the tumor biomarker HPV-16 DNA. Independent of sample variability from salivary viscosity and collection methods, it may suit clinical use. Dr. Huang highlighted automated rapid isolation, compared with approximately 8 hours using benchmark technologies, less than 5 minutes processing . Analyses can be relatively inexpensive in clinics. Unlike conventional biopsy , it suits repeated continuous monitoring of progression and response. It surpasses industry standards, shortens testing, addresses unmet needs, and may accelerate exosome research and biomarker discovery. In conclusion, salivary exosome liquid / fluid biopsyis an effective early detection and risk assessment approach for oropharyngeal cancer. Acoustofluidic separation offers fast, biocompatible, high-throughput, pure, label-free isolation. Researchers say blood, urine, and other fluids could also be analyzed.

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