Prepared by: Tatjana Kofol Bric, Jona Bambič 
Date of last change: March 2018

Purpose and justification of the indicator

Breast cancer is the most common cancer in women in the developed world. In total, it accounts for about 20% of cancers in women. It is one of the most important causes of premature mortality. Risk factors for the occurrence of breast cancer are: demographic factors, maternity factors, hormones, alcohol, obesity, ionizing radiation, mammographic breast opacity and heredity.
Women over the age of 50 get sick more often, about 20% are younger. The probability of an individual born in 2014 to get cancer by the age of 75 is 7.4%
In Slovenia, in the period 2010-2014, an average of 1,265 women were diagnosed with breast cancer annually, and 402 of them died. The relative five-year survival of breast cancer patients is improving and in the period 2010-2014 was 85.1% for women of all ages.
The chance of a cure is high if breast cancer is detected in time, when it is still in the early stages of development. For the purpose of early detection, the National Breast Cancer Screening Program DORA is organized in Slovenia, as part of which women aged 50-69 are invited to undergo screening mammography. Mammography is the most reliable and accurate method for identifying initial cancerous changes in the breast, which can detect cancer when it is not yet detectable.
Breast cancer can be prevented and its frequency reduced with appropriate preventive measures. Encouraging responsiveness to the screening program, raising awareness of the importance and education of self-examination and promotion of a healthy lifestyle - preventing the development of risk factors such as obesity, smoking, excessive alcohol consumption and exposure to harmful environmental factors.

Definition of indicator

The incidence rate of breast cancer shows the average annual incidence of breast cancer per 100,000 inhabitants during the observed five-year period. An age-standardized rate is calculated, which enables mutual comparison of populations with different age structures.

Unit of measure

Age-standardized rate per 100,000 women.

Calculation of the indicator

The incidence rate of breast cancer is the ratio of the number of new cases of breast cancer in the observed population of women in one calendar year to the number of women in the observed population at the middle of the same calendar year, multiplied by 100,000.
The disease category according to the ICD-10 classification, which is included in the calculation, is C50.
New cases of breast cancer
<math xmlns="http://www.w3.org/1998/Math/MathML"><mo>=</mo><mfrac><mrow><mi>T</mi><mi>h</mi><mi>e</mi><mo>&#160;</mo><mi>n</mi><mi>u</mi><mi>m</mi><mi>b</mi><mi>e</mi><mi>r</mi><mo>&#160;</mo><mi>o</mi><mi>f</mi><mo>&#160;</mo><mi>n</mi><mi>e</mi><mi>w</mi><mo>&#160;</mo><mi>c</mi><mi>a</mi><mi>s</mi><mi>e</mi><mi>s</mi><mo>&#160;</mo><mi>o</mi><mi>f</mi><mo>&#160;</mo><mi>b</mi><mi>r</mi><mi>e</mi><mi>a</mi><mi>s</mi><mi>t</mi><mo>&#160;</mo><mi>c</mi><mi>a</mi><mi>n</mi><mi>c</mi><mi>e</mi><mi>r</mi></mrow><mrow><mi>N</mi><mi>u</mi><mi>m</mi><mi>b</mi><mi>e</mi><mi>r</mi><mo>&#160;</mo><mi>o</mi><mi>f</mi><mo>&#160;</mo><mi>w</mi><mi>o</mi><mi>m</mi><mi>e</mi><mi>n</mi><mo>&#160;</mo><mi>i</mi><mi>n</mi><mo>&#160;</mo><mi>t</mi><mi>h</mi><mi>e</mi><mo>&#160;</mo><mi>o</mi><mi>b</mi><mi>s</mi><mi>e</mi><mi>r</mi><mi>v</mi><mi>e</mi><mi>d</mi><mo>&#160;</mo><mi>p</mi><mi>o</mi><mi>p</mi><mi>u</mi><mi>l</mi><mi>a</mi><mi>t</mi><mi>i</mi><mi>o</mi><mi>n</mi></mrow></mfrac><mo>&#215;</mo><mn>100</mn><mo>.</mo><mn>000</mn></math>
The direct standardization method is used to calculate the age-standardized rate, where the Slovenian population from 2014 is used as the standard population. The incidence rate of breast cancer is shown as an average of five consecutive years.

Data sources for Slovenia

Cancer Registry of the Republic of Slovenia, Institute of Oncology
Population, Statistical Office of the Republic of Slovenia.

Time availability

Data on the incidence of breast cancer are published annually.

Men in literature

<ol>
<li>Zadnik V, Primic Žakelj M. SLORA: Slovenia and cancer. Cancer Epidemiology and Registry. Oncology Institute Ljubljana. <a href="http://www.slora.si" target="_blank" rel="noopener">www.slora.si</a> (February 20, 2018).</li>
</ol>
2. Cancer in Slovenia 2014. Ljubljana: Oncology Institute Ljubljana, Cancer Epidemiology and Registry, Cancer Registry of the Republic of Slovenia, 2017.
3. Regular screening program for breast cancer ( <a href="http://dora.onko-i.si/" target="_blank" rel="noopener">http://dora.onko-i.si/</a> )

Notes

We do not add disease categories to the incidence of breast cancer according to IKB-10 classification D05 &ndash; breast, in situ.

Health status

Prepared by: Metka Zaletel 
Date of last modification: September 2016

Residents and community

Prepared by: Mojca Simončič and Metka Zaletel 
Date of last change: January 2018

Prepared by: Mojca Simončič and Metka Zaletel 
Date of last change: September 2016

Prepared by: Mojca Simončič 
Date of last change: March 2017

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Date of last modification: September 2016

Health risk factors

Prepared by: Gregor Starc, Kristina Orožen 
Date of last change: September 2016

Prepared by: Tina Lesnik 
Date of last change: March 2021

Prepared by: Andreja Belščak 
Date of last change: September 2016

Prepared by: Mateja Rok Simon and Tina Zupanič 
Date of last change: March 2017

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Date of last modification: March 2019

Prepared by: Victoria Zakrajšek 
Date of last change: March 2021

Prepared by: Martin Ranfl, Jona Bambič 
Date of last change: November 2017

Prepared by: Victoria Zakrajšek, Tatjana Kofol Bric 
Date of last change: March 2019

Prepared by: Jasmina Staroveški Anderlič 
Date of last change: March 2020

Prepared by: Victoria Zakrajšek 
Date of last change: November 2021

Prepared by: Victoria Zakrajšek 
Date of last change: March 2023

Prepared by: Tatjana Kofol Bric 
Date of last modification: September 2016

Preventive

Prepared by: Victoria Zakrajšek and Sonja Tomšič 
Date of last change: March 2017

Prepared by: Bonia Miljavac 
Date of last change: March 2017

Prepared by: Sonja Tomšič 
Date of last change: November 2019

Prepared by: Sonja Tomšič 
Date of last change: March 2021

Prepared by: Victoria Zakrajšek 
Date of last change: March 2017

Prepared by: Aleš Korošec 
Date of last change: September 2016

Prepared by: Aleš Korošec
Date of last change: September 2016

Prepared by: Tatjana Kofol Bric 
Date of last change: March 2019

Prepared by: Aleš Korošec and Sonja Tomšič 
Date of last change: September 2016

Prepared by: Mojca Simončič and Metka Zaletel 
Date of last change: October 2019

Prepared by: Kristina Orožen 
Date of last change: March 2019

Prepared by: Victoria Zakrajšek, Tatjana Kofol Bric 
Date of last change: February 2020

Prepared by: Ema Ahačič 
Date of last change: April 2023

Prepared by: Ema Ahačič 
Date of last change: March 2023

Mortality

Prepared by: Sonja Tomšič, Tatjana Kofol Bric 
Date of last change: March 2019

Prepared by: Sonja Tomšič 
Date of last change: March 2019

Prepared by: Tina Lesnik 
Date of last change: March 2019

Prepared by: Tina Lesnik 
Date of last change: March 2020