Researchers at Universidade Kitasato, at Japão, demonstrated that the circular polarized light scattering (CiPLS) imaging technique can identify dysplastic cells located in deeper layers of the cervical epithelium, even when covered by normal tissue. The study, published on February 6, 2026 in Journal of Biomedical Optics, highlights the possibility of evaluating the distribution and depth of these precancerous lesions non-invasively and without the need for staining. Essa approach represents a significant advance for the early diagnosis of cervical cancer, which often progresses from cervical intraepithelial lesions (CIN).
The research involved collaboration between Departamento of Física of Faculdade of Ciências of Kitasato University, Departamento of Líderes of the group include teacher Nozomi Nishizawa, lecturer Toshihide Matsumoto and teacher Takahiro Kuchimaru. The results were selected as the cover image for the edition of the scientific magazine.
Advancement in optical detection of occult lesions
CiPLS uses circular polarized light to measure changes in scattering caused by enlarged cell nuclei typical of tumor cells. Núcleos of dysplastic cells are about twice the size of normal cells. Essa difference generates measurable variations in the degree of circular polarization (DOCP).
Tests on artificial samples with simulated layers of healthy and cancerous tissue confirmed the sensitivity of the method. The technique achieves light penetration of up to 2 mm in biological tissue. Isso encompasses the typical thickness of the cervical epithelium in early stages of CIN, which ranges from 0.3 to 0.7 mm.
Results on model samples
The experiments employed wavelengths of 617 nm and 850 nm to analyze the propagation of light. At the shorter wavelength, DOCP decreases with increasing depth of the cancerous layer. Já at the longest length, an increase in DOCP is observed under similar conditions.
The ΔDOCP difference eliminated influences from superficial reflections and focused on the depth of the lesion. Essa metric demonstrated high sensitivity to the vertical position of dysplastic cells, regardless of the exact thickness of the affected layer. The data indicate feasibility for application to real cervical tissues.
Future application in clinical practice
The technique does not require cell collection or application of dyes, reducing discomfort for patients. Especialistas hope to integrate the method into colposcopes or flexible endoscopes for routine examinations. Isso would facilitate monitoring of low-grade injuries without repeated interventions.
Researchers plan to validate the findings in human cervical tissue samples. Correlações with traditional pathological analysis will be performed to confirm accuracy. The development of wearable devices is also anticipated to expand clinical use.
Research collaboration and funding
The work was supported by several Japanese funding sources. Grants of JSPS Kakenhi (numbers 19H04441, 22H03921, 23K25175 and 25K03438) supported the project. Adicionalmente, Fundação of Ciências of
The research integrates efforts in medical-dental bioengineering. Equipes multidisciplinary teams combined knowledge of optical physics and medical hygiene. Essa integration allowed advances in the detection of subtle cellular changes.
CiPLS technical details
Circular polarized light vibrates in a rotating pattern as it propagates through the tissue. Larger Partículas, such as hypertrophied tumor nuclei, alter this polarization in a specific way. The DOCP index quantifies this change and allows mapping the depth of the lesions.
At CIN1 and CIN2 stages, dysplastic cells often form in the basal layers of the epithelium. Conventional cytological examination detects only superficial cells, limiting accuracy. CiPLS overcomes this barrier by evaluating deep structures without direct contact.
The study demonstrates that the CiPLS technique offers potential for early diagnosis of cervical precancerous lesions in a non-invasive manner. Pesquisadores continue to refine the method for practical application in gynecological examinations.