e23255 Background: Breast cancer affects a considerable proportion of women of childbearing age making it important to provide options for fertility preservation. At Chihuahua's State Cancer Center, a state-federal-funded institution providing free oncological care, and ensuring access to fertility preservation measures is integral to the multidisciplinary approach for young cancer survivors. Recognizing chemotherapy's impact on fertility, implementing fertility preservation measures is key. Assessing adherence to these guidelines is essential for comprehensive care and holistic well-being in young breast cancer patients at our center. Methods: In this retrospective study at the Chihuahua´s State Cancer Center, we examined adherence to fertility preservation guidelines among breast cancer patients aged 18 to 40 years. The primary method used for fertility preservation was the administration of GnRH analogs, such as triptorelin and goserelin. Data on GnRH analog use, chemotherapy regimens, and patient demographics were collected from medical records. The study aimed to assess the integration of fertility preservation measures, particularly GnRH analogs, into treatment plans for young breast cancer patients. Additionally, we aimed to identify barriers to accessing fertility preservation services in this population. Results: The study findings revealed that out of the 749 registered breast cancer patients, 95 (12.6%) were 40 years old or younger. Among these, 75 (79%) received adjuvant and/or neoadjuvant chemotherapy, with 58 (77.3%) being in locally advanced clinical stages. Of the 75 patients who underwent chemotherapy, 20 (26.7%) also received GnRH analogs, while 55 (73.3%) did not. Among the 75 chemotherapy recipients, 16 (p = 0.046) were estrogen receptor-positive and received analogs. Furthermore, out of the 20 patients with triple-negative breast cancer, only 1 (1.3%) received an analog. Conclusions: The study indicates that GnRH analogs usage in breast cancer patients is significantly associated with estrogen receptor positivity. While estrogen receptor status is crucial for determining treatment suitability, GnRH analog utilization was notably low among triple-negative breast cancer patients. This suggests that triple-negative status alone should not preclude GnRH analog use. The findings underscore the need to raise awareness and improve adherence to ovarian suppression recommendations to enhance clinical outcomes and quality of life for breast cancer patients.