This study will be a non-randomized pilot trial using Cyclophosphamide and Sirolimus for the treatment of metastatic differentiated thyroid cancer. Patients will be treated with Sirolimus 4 mg, PO, days 1-28 as well as Cyclophosphamide 100 mg, PO, days 1-5 and 15-19. Cycle length will be 28 days. Patients will be monitored closely for toxicity and undergo imaging to evaluate efficacy once every 2 cycles.
Histologically documented differentiated thyroid cancer with or without metastases, not amenable to curative treatment; or the patient has documented refusal of curative treatment
Measurable disease (>10 mm) and have progression of disease based on RECIST criteria. Previously irradiated tumor lesions are not considered measurable unless they have progressed since radiation.
Previous failure of Iodine-131 (131I) therapy or not candidates to receive 131I as assessed by treating physician.
Age ≥ 18 years
Inability to obtain Foundation One testing on archival tissue, or, lack of previous Next Generation Sequencing
Chemotherapy, tyrosine kinase inhibitor, or radiation therapy within 4 weeks
Prior experimental therapy within 4 weeks of planned start of this trial
131I therapy within 24 weeks before entry (4 weeks if negative post-treatment scan)
Single group
Cyclophosphamide
DrugCyclophosphamide 100 mg, PO, days 1-5 and 15-19
Sirolimus
DrugSirolimus 4 mg, PO, days 1-28
Percentage of patients that respond to treatment
The primary measure of efficacy will be the overall response rate (ORR) which is defined as those achieving either complete response (CR) or partial response (PR). Partial response is defined as at least a 30% decrease in the sum of the longest diameter (LD) of target lesions. Complete response is defined as Disappearance of all target lesions, determined by two separate observations conducted not less than 4 weeks apart (there can be no appearance of new lesions) and the disappearance of all non-target lesions and normalization of tumor marker level.
The number of patients that experience toxicity
The number of patients that experience toxicity by type will be reported.
Median overall survival time
The median duration of time from start of treatment until death
Median progression free survival time
The median duration of time from start of treatment until progression. Progression is defined as at least a 20% increase in the sum of the LD (longest diameter) of target lesions, taking as reference the smallest sum LD recorded since the treatment started, or the appearance of one or more new lesions and/or unequivocal progression of existing non-target lesions.
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