Breast tissue diagnosis by Raman spectroscopy B. Brożek-Płuska* , J.Surmacki*, J. Jabłońska**, R. Kordek**, H. Abramczyk* *Laboratory of Laser Molecular Spectroscopy, Institute of Applied Radiation Chemistry, Technical University of Łódź, Faculty of Chemistry, Poland **Department of Oncology, Medical University of Łódź, Poland
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Breast tissue diagnosis by Raman · PDF fileBreast tissue diagnosis by Raman spectroscopy ... •non-invasive,non-ionizing method that probes with ... carcinoma lobulare infiltrans
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Breast tissue diagnosis by Raman spectroscopy
B. Brożek-Płuska*, J.Surmacki*, J. Jabłońska**, R. Kordek**,
H. Abramczyk*
*Laboratory of Laser Molecular Spectroscopy, Institute of Applied Radiation Chemistry, Technical University of Łódź, Faculty of Chemistry, Poland**Department of Oncology, Medical University of Łódź, Poland
GOAL
Some substances are produced by the organism in response to thecancer’s presence. They are called tumor markers.Tumor markers are molecules occurring in blood or tissue that areassociated with cancer and whose measurement or identification is useful inpatient diagnosis or clinical management. The ideal marker would be a“blood test” for cancer in which a positive result would occur only inpatients with malignancy, one that would correlate with stage and responseto treatment and that was easily and reproducibly measured. No tumormarker now available has met this ideal.
We believe that optical methods including Raman spectroscopy will provide such a marker. Possibly it will help to find the hallmarks of cancer.
•immediate in vivo diagnosis
•reduction the number of biopsies
•combination of biochemical and histopathologicaldiagnosis provides more information because pathology
is intimately related to biochemistry
•method has a potential to remove human interpretation
•non-invasive,non-ionizing method that probes with chemical specificity –vibrations and fluorescence (not just
structure)
• extremaly high spatial resolution (optical imaging)
Why ?
Human speciemens obtained from surgery. Upon removal during the operation, the ex vivo sample is devided by a doctor into two parts, one goes to our lab the second goes to the pathology examination
The ex vivo samples are neither frozen in liquid nitrogen for storage nor fixed in formalin, the fresh tissue is measured immeditely after delivering from the hospital
The samples for pathology measurements are passively thawed at room temperature and kept moist with PBS fixed in formalin
Cut through the marked locations into 5-μm-thick sections, and stained with eosin
normal tissue
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Raman shift in wavennumbers [cm-1]
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Raman shift in wavennumbers [cm-1]
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maligant tissue
Tissue Preparation
carcinoma mammae fibroadenoma mammae
Measurements Parameters
The laser excitation is 514 nm, the spot is d=500 μm in diameter
Light diffusion in the tissue results in a spot of v≈1mm
PCA score plot – mean center, SNV, 1-st derivative
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Samples/Scores Plot of HY
Decluttered
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Malignant tissue
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tissue
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Variables/Loadings Plot for HY
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C-H
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PCA loading plot – mean center, SNV, 1-st derivative
CONCLUSIONSThe results clearly illustrates the ability of Raman spectroscopy to accurately diagnose breast cancer and demonstrates how the diagnostic scheme can be adjusted to obtain the desired degree of sensitivity and specificity (88%,72%)
The normal tissue has a characteristic bands: C-C (1110 cm-1)and C=C (1520 cm-1) stretching bands of carotenoids and at2840-2900 cm-1 for the C-H symmetric and asymmetric bands oflipids (fat) which are not visible in the malignant tissue and inbenign tumor tissue. Moreover, the fluorescence is much higherin the malignant tissue.
We belive that in a very near future a good quality Raman signal will be obtained with the optical fibers coupled with a biopsy needle and incorporated into Raman spectrometer for breast tissue measurements in vivo.