Patient description: A 16-year-old girl came to the clinic complaining of weight gain and abnormal menstrual cycles. Her BMI was 24, but she has gained 5 kg in the past few weeks. She gets tired more frequently and does not have energy to go dancing with her friends. Her lab results were remarkable for high TSH levels (15 mU/L) and low free T4 levels (0.18 ng/dl). Her anti-TPO levels were extremely high (136 IU/ml). She was diagnosed with Hashimoto disease. She does not smoke and she is not sexually active.

Clinical trial eligibility criteria: eligible ages (years): 1.0-21.0,  Recurrent Adrenal Gland Pheochromocytoma Recurrent Ectomesenchymoma Recurrent Ependymoma Recurrent Ewing Sarcoma Recurrent Hepatoblastoma Recurrent Kidney Wilms Tumor Recurrent Langerhans Cell Histiocytosis Recurrent Malignant Germ Cell Tumor Recurrent Malignant Glioma Recurrent Medulloblastoma Recurrent Melanoma Recurrent Neuroblastoma Recurrent Non-Hodgkin Lymphoma Recurrent Osteosarcoma Recurrent Peripheral Primitive Neuroectodermal Tumor Recurrent Rhabdoid Tumor Recurrent Rhabdoid Tumor of the Kidney Recurrent Rhabdomyosarcoma Recurrent Soft Tissue Sarcoma Recurrent Thyroid Gland Carcinoma Recurrent WHO Grade II Glioma Refractory Adrenal Gland Pheochromocytoma Refractory Ependymoma Refractory Ewing Sarcoma Refractory Hepatoblastoma Refractory Langerhans Cell Histiocytosis Refractory Malignant Germ Cell Tumor Refractory Malignant Glioma Refractory Medulloblastoma Refractory Melanoma Refractory Neuroblastoma Refractory Non-Hodgkin Lymphoma Refractory Osteosarcoma Refractory Peripheral Primitive Neuroectodermal Tumor Refractory Rhabdoid Tumor Refractory Rhabdoid Tumor of the Kidney Refractory Rhabdomyosarcoma Refractory Soft Tissue Sarcoma Refractory Thyroid Gland Carcinoma Refractory WHO Grade II Glioma Patient must have enrolled onto APEC1621SC and must have been given a treatment assignment to MATCH to APEC1621M based on the presence of an actionable mutation Patients must have a body surface area >= 0.29 m^2 at enrollment Patients must have radiographically measurable disease at the time of study enrollment. Patients with neuroblastoma who do not have measurable disease but have metaiodobenzylguanidine (MIBG) positive (+) evaluable disease are eligible. Measurable disease in patients with CNS involvement is defined as tumor that is measurable in two perpendicular diameters on magnetic resonance imaging (MRI) and visible on more than one slice Note: The following do not qualify as measurable disease Malignant fluid collections (e.g., ascites, pleural effusions) Bone marrow infiltration except that detected by MIBG scan for neuroblastoma Lesions only detected by nuclear medicine studies (e.g., bone, gallium or positron emission tomography [PET] scans) except as noted for neuroblastoma Elevated tumor markers in plasma or cerebral spinal fluid (CSF) Previously radiated lesions that have not demonstrated clear progression post radiation Leptomeningeal lesions that do not meet the measurement requirements for Response Evaluation in Solid Tumors (RECIST) 1.1  Pregnant or breast-feeding women will not be entered on this study due to risks of fetal and teratogenic adverse events as seen in animal/human studies. Pregnancy tests must be obtained in girls who are post-menarchal. Males or females of reproductive potential may not participate unless they have agreed to use two effective contraceptive methods for the duration of study treatment. Both female subjects and male subjects with female partners of child-bearing potential must agree to use a highly effective method of contraception for 2 weeks prior to protocol therapy, during, and at least 4 weeks after last dose of tipifarnib. In addition, since tipifarnib could induce toxicity of male reproductive organs and cause impairment of fertility, sperm cryopreservation should be recommended for male subjects wishing to preserve their fertility following tipifarnib treatment Patients receiving corticosteroids who have not been on a stable or decreasing dose of corticosteroid for at least 7 days prior to enrollment are not eligible. If used to modify immune adverse events related to prior therapy, >= 14 days must have elapsed since last dose of corticosteroid Patients who are currently receiving another investigational drug are not eligible Patients who are currently receiving other anti-cancer agents are not eligible Patients who are receiving cyclosporine, tacrolimus or other agents to prevent graft-versus-host disease post bone marrow transplant are not eligible for this trial Patients who are currently receiving drugs that are strong inducers or inhibitors of CYP3A4/5 or UGT are not eligible. Strong inducers or inhibitors of CYP3A4/5 or UGT should be avoided from 14 days prior to the 1st dose of tipifarnib to the end of the study. In addition, patients receiving agents that are sensitive or narrow therapeutic range substrates of CYP3A4/5 are not eligible. Note: CYP3A4/5 inducing anti-epileptic drugs and dexamethasone for CNS tumors or metastases, on a stable dose, are allowed Patients with known hypersensitivity to tipifarnib or any components of the tablet are not eligible Patients with hypersensitivity to imidazoles, such as clotrimazole, ketoconazole, miconazole and others in this drug class are not eligible Patients who have an uncontrolled infection are not eligible Patients who have received a prior solid organ transplantation are not eligible