The study is designed to evaluate the effectiveness of liquid crystal contact thermography in detecting pathological changes in female breasts compared to standard diagnostic methods.

The study is a multicentre, observational, cross-sectional, open and monitored trial involving approx. 3000 females who will be subject to an examination using liquid crystal contact thermography device as a complementary tool to standard diagnostic imaging procedures of the breast glands. The study is conducted in specialist outpatient clinics. Patients are eligible to participate in the study upon signing the informed consent form. There is no follow up after the thermographic examination.

The study will comprise of a single registration of thermographic images of the breasts which will be subjected to automatic and expert analysis by radiologists.

Primary objective of the study is to determine and compare the diagnostic efficacy of breast thermography using a medical device based on liquid crystal contact thermography to standard of care.

The subjects were divided into three groups based on age and Breast Imaging Reporting and Data System (BI-RADS). Thermography was performed as a complementary modality to standard of care. In group A, the investigators recruited women aged 18-49, who has a breast ultrasound performed and a result of BI-RADS 4b, 4c or 5. In group B, the investigators recruited women over 50 years of age with either a result of BI-RADS 4, 4a, 4b, 4c or 5 on mammography or BI-RADS 4a, 4b, 4c or 5 on ultrasound. If a positive result was present on one of these examinations, the other examination needed to be performed. Lastly, in group C, the investigators recruited women aged 18 and above with a BI-RADS score of 1 or 2 on mammography and/or breast ultrasound.

Predicted duration of the study is approximately 24 months.

Inclusion Criteria:

- a woman aged 18 or above (without any upper age limit) who gives informed consent to the participation in the study by signing the Informed Consent Form and meets one of the below requirements may take part in the study:

1. For women aged 18-49: ultrasound imaging of breasts was performed; category of the final assessment of the study according to the BI-RADS scale 4b, 4c or 5.
2. For women aged 50 or above (in the B group, a mammography examination in the final assessment category according to the BI-RADS scale 4, 4a, 4b, 4c or 5; or the breast ultrasound in the final assessment category according to the BI-RADS scale 4a, 4b, 4c or 5 (but both examinations are obligatory); in the C2 group, mammography or breast ultrasound in the final category of the examination assessment according to the BI-RADS scale 1, 2 (but both examinations are obligatory). -

Exclusion Criteria:

1. Performed invasive diagnostics of changes in breasts (treatment performed less than 12 months before inclusion into the study) - relates to a core- needle and mammotome biopsy (also a fine-needle biopsy performed up to 4 weeks before inclusion to the study).
2. A breast surgery within 12 months before inclusion into the study (including cosmetic surgeries, i.e. aesthetic implants, fat-graft transfer and hyaluronic acid injection into breasts.
3. A visible, considerable breasts asymmetry that makes the examination with an equal number of matrix applications on both breasts impossible.
4. A visible considerable breast deformation including appearance of scarring on the breast skin which makes adjustment of the entire matrix surface to the breast gland impossible.
5. Previous or ongoing anti-tumour treatment due to the breast cancer.
6. Symptomatic acute or chronic breast inflammation, with visible features of inflammation: pain, increased temperature, skin redness, swelling, breast abscesses, breast vessels thrombosis.
7. Injury to the breasts with visible clinical properties of extravasation.
8. A patient is suffering from an active infection with the body temperature equal to or more than 37.5°C.
9. Pregnancy and lactation (pregnancy must be ruled out based on the last period date (< 30 days), or using effective contraception - with regard to women from group A, in case of any doubts performance of the stripe pregnancy test).
10. Alcohol consumption on the day of the visit at the doctor's.
11. Intensive physical effort up to 30 minutes before thermographic examination.
12. Bath/shower (approximately 2 hours before thermographic examination).
13. Using sauna/ steam bath on the day of examination, before thermographic examination.
14. Cosmetic and beauty treatments before examination: peeling within the neckline and breasts, hair removal within armpits, application of cosmetics on the breast skin (approximately 2 hours before thermographic examination).
15. A direct stay close to the heat or cold sources such as heaters or air conditioners 30 minutes before thermographic examination.

The planned number of patients included in the observational study is 3000 women aged 18 and above in which breast ultrasound or mammography were performed as a part of standard breast gland diagnostics, the key element of which is a final assessment of the study with the BI-RADS scale (Breast Imaging Reporting and Data System). Participants of the study will be divided into three cohorts based on age and results from breast ultrasound and/or mammography.