This is a validation study of the italian language for the Female Sexual Function Index-Breast Cancer questionnaire.

The validation of the instrument in Italian will allow the identification of possible issues related to sexual health and enable the provision of adequate medical and psychosexual counseling to these patients, both in clinical practice and in research studies.

The original version of the questionnaire will be validated in two phases: a) translation, b) reliability.

1. Translation of the items and administration to a small sample of volunteers to assess usability.

   In the first phase, the questionnaire will be translated following the 5 steps:

   1. forward translation by two independent translators (from English to Italian);
   2. synthesis (discussion between translators to resolve any discrepancies);
   3. backward translation (from Italian to English) by two additional independent translators;
   4. expert committee (translators, psychologists, sexology consultants) comparing the two versions of the questionnaire; 5) testing the first version of the questionnaire with a sample (N=20) of native Italian speakers to evaluate the adequacy of content and clarity of terms used and proceeding to the final version.

2. Reliability of the questionnaire. To assess the reliability of the questionnaire, it will be administered again after a 2-week interval to a smaller sample compared to the recruited patient sample.

Inclusion Criteria:

1. Women with operable breast cancer;
2. Operated on between 2012 and 2020;
3. Randomly selected from the institutional database; 18 years of age (Age stratification: equally represented women aged <50 years and women aged ≥50 years);
4. Signing of the informed consent.

Exclusion Criteria:

1. Severe psychiatric or cognitive illness;
2. Ongoing psychological treatment.

Patients treated at European Institute of Oncology for a operable breast cancer between 2012 and 2020