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Anaplastic Thyroid Cancer is the most aggressive thyroid cancer with a median survival of just five months. Long term survival has been reported in locally aggressive cases but has yet to be reported in metastatic disease. This is a report of a 34-year-old male who presented with symptoms of dizziness, confusion, intermittent headaches, and erratic behavior for two weeks found to have metastatic anaplastic thyroid cancer. CT of the head revealed a 1 cm ring enhancing lesion and he was taken to the operating room for a left parietal craniotomy with mass removal. Initial pathology suggested papillary thyroid origin. His neck exam revealed a palpable 3 cm mass in the right thyroid lobe and he subsequently underwent total thyroidectomy. Final pathology revealed anaplastic carcinoma identical to the brain lesion. Post-operatively, he underwent 15 cycles of whole brain radiation therapy. Two additional brain lesions were identified after thyroidectomy and a third was identified after whole brain radiation. He underwent stereotactic radiosurgery of these three lesions less than two months after thyroidectomy. The patient went on to receive modified mantle field irradiation to the neck, thyroid bed, and the upper mediastinum and chemotherapy with doxorubicin for 6-8 weeks and temozolomide for 2 years. Radioactive iodine treatment was not administered. The patient has currently survived 17 years and his persistent, but stable, brain lesions are being followed with serial imaging. He remains clinically and neurologically asymptomatic. This is the first case presenting with long-term survival in a patient with metastatic anaplastic thyroid carcinoma.

120 Background: Data is limited regarding rates of breast cancer and mammography screening within the transgender/non-binary (TGNB) population. Screening recommendations vary and there is no global consensus. TGNB patients face unique challenges that may preclude screening and risk assessment, such as barriers to accessing healthcare, lack of provider education, and limited data regarding hormonal impacts on risk. This study aims to address adherence to current screening mammogram recommendations within the TGNB population at a single hospital system. Methods: A retrospective chart review was performed using ICD codes, sexual orientation and gender identity data, and key words to identify TGNB patients that had contact with the Northwestern Hospital system between March 2019 and February 2021. Patients designated female at birth (DFAB) and age ≥ 40 with breasts at time of screening eligibility were included as well as patients designated male at birth (DMAB) and age ≥ 50 with ≥ 5 years of hormone therapy (HT). Rates of screening mammogram were evaluated along with analysis of demographic factors that may predict for or against adherence to recommendations. ASBrS and USPSTF guidelines, screening mammograms starting at age 40 and 50, respectively, were applied to patients DFAB. UCSF Center for Transgender Health and Fenway Health guidelines (screening mammogram at age 50 and ≥ 5 years of HT) were applied to patients DMAB. Results: The table illustrates screening adherence rates according to guidelines with two definitions of adherence. We evaluated patients who had screening mammogram “on-time” which was defined at age 40 or 50 with a two year grace period. We also defined adherence as having had a screening mammogram within the two year study period regardless of age. Univariate analysis and multivariate analysis evaluating for insurance status, employment status, level of education, and hormone use did not identify any factors associated with likelihood of adhering to screening guidelines in either the DFAB or DMAB population. Conclusions: Adherence to screening mammogram recommendations among the TGNB population at Northwestern Hospital system is low across all sub-groups. In contrast, the ACO rate of adherence to screening mammogram (within the last two years) at our institution for all-comers (age ≥ 50-74) in 2019 was 77.33%. Demographic data failed to elucidate any association with likeliness to undergo appropriate breast cancer screening. This disparity demands the development of initiatives aimed at increasing breast cancer screening rates for the Northwestern TGNB population.[Table: see text]

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