Inclusion Criteria

- INCLUSION CRITERIA

- Diagnosis

- Patient's current disease state must be one for which there is no known curative
therapy or therapy proven to prolong survival with an acceptable quality of life.

- Phase I Portion: Measurable or evaluable refractory or recurrent extracranial solid
tumors, excluding brain tumors and cerebral metastases.

- Phase II Portion adults and children: Refractory or recurrent extracranial Ewing
sarcoma with EWS-FLI1 fusion transcript. Patients enrolled to this cohort must have
measurable disease. Presence of the transcript will be determined during histologic
confirmation of disease with a CLIA approved EWS-FLI paraffin assay in the Laboratory
of Pathology CCR, NCI, unless a pathology report documenting presence of the
transcript using a CLIA approved assay is obtained from the referring institution.

- Histologic confirmation of disease in the Laboratory of Pathology, CCR, NCI, NIH.

- Age

- Phase I Portion: greater than or equal to 12 months to less than or equal to 17
years

- Phase II Portion in adults initially: greater than or equal to 18 years

- Phase II Portion expanded in pediatrics after determination of phase II dose in
children will include children greater than or equal to 12 months to less than or
equal to 17 years

- Performance Score: Karnofsky (> 10-17 years old) or Lansky (less than or equal to
10 years old) greater than or equal to 50%, or ECOG 1 or 2 (adults)

- Prior therapy

- greater than or equal to 2 weeks must have elapsed since local palliative XRT (small
port);

- greater than or equal to 24 weeks must have elapsed since prior TBI, craniospinal
XRT, or if greater than or equal to 50%

- radiation of pelvis;

- greater than or equal to 6 weeks must have elapsed since other substantial BM
radiation;

- greater than or equal to 12 weeks must have elapsed since stem cell transplant or
infusion without TBI and no active graft vs. host disease;

- greater than or equal to 3 weeks must have elapsed from last dose of
myelosuppressive chemotherapy (six

weeks for nitrosoureas);

at least 3 half-lives must have elapsed since monoclonal
antibody1;(https://members.childrensoncologygroup.org/Disc/devtherapeutics/default.asp for
listing of monoclonal antibody half-lives.)

- greater than or equal to 7 days must have elapsed from the last dose of biologic
agents.

- greater than or equal to 7 days since the completion of therapy with a growth factor

- Recovered from acute toxicities of prior therapy to less than or equal to Grade 1;
specifically

a) Hematologic and Coagulation Parameters

i. Peripheral ANC greater than or equal to 1000/mcL

ii. Platelets greater than or equal to 75,000/ mcL (transfusion independent)

iii. Hemoglobin greater than or equal to 8 g/dL (PRBC transfusions permitted)

iv. Normal PT/PTT/fibrinogen with the exception of a lupus anticoagulant, which is
permitted, may be corrected with Vitamin K administration or transfusion.

b) Hepatic Function

i. Bilirubin (total) less than or equal to 1.5 times upper limit of normal (ULN)

ii. ALT (SGPT) less than or equal to 3.0 times ULN

iii. Albumin > 2 g/dL

c) Renal Function

i. Creatinine clearance greater than or equal to 60 mL/min/1.73 m(2), or serum creatinine
base on age and gender as follows:

Age (years) Maximum Serum Creatinine (mg/dL)

2 to < 6 0.8 0.8

6 to < 10 1 1

10 to < 13 1.2 1.2

13 to < 16 1.5 1.4

greater than or equal to 16 1.7 1.4

- Normal calcium, magnesium and phosphorus (can be on oral supplementation

- Cardiac Function: Left ventricular ejection fraction (EF) within normal institutional
limits by Echocardiogram or MUGA

- Ability to give informed consent. For patients < 18 years of age their legal guardian
must give informed consent. Pediatric patients will be included in ageappropriate
discussion in order to obtain verbal assent.

- Female and male patients (and when relevant their partners) must be willing to
practice birth control (including abstinence) during and for two months after
treatment, if of childbearing potential during sexual contact with a female of
childbearing potential.

- A durable power of attorney (DPA) will be offered to all patients greater than or
equal to 18 years old.

- Eligibility criteria for mandatory serial tumor biopsies

- Age: greater than or equal to 18 years old

- Ewing sarcoma with EWS-FLI1 fusion transcript

- Hematologic and coagulation parameters within 2 days prior to each biopsy: Normal
PT/PTT with exception of lupus anticoagulant, platelets greater than or equal to
75,000/mcL, peripheral ANC greater than or equal to 750/mcL

- Willing to undergo biopsies, which will only be performed on tumors amenable to
percutaneous biopsy

EXCLUSION CRITERIA:

- Clinically significant systemic illness (e.g. serious active infections or
significant cardiac, pulmonary, hepatic or other organ dysfunction), that in the
judgment of the PI would compromise the patient's ability to tolerate protocol
therapy or significantly increase the risk of complications.

- Patients with cerebral metastases

- Patients with evidence of active bleeding, intratumoral hemorrhage or history of
bleeding diatheses

- Patients who are receiving anticoagulants other than prophylactic anticoagulation of
venous or arterial access devices, provided that requirements for PT, PTT and
fibrinogen are met, as described

- Investigational Drugs: Patients who are currently receiving another investigational
drug

- Patients who are concurrently receiving agents, which may increase the risk for
mithramycin related toxicities, such as hemorrhage including:

- Thrombolytic agents

- Anti-inflammatory drugs, nonsteroidal (NSAIDs) or aspirin or salicylatecontaining
products, which may increase risk of hemorrhage

- Dextran

- Dipyridamole

- Sulfinpyrazone

- Valproic acid

- Anti-cancer Agents: Patients who are currently receiving other anti-cancer agents

- Lactating or pregnant females (due to risk to fetus or newborn, and lack of testing
for excretion in breast milk).

- Patients with history of HIV, HBV or HCV due to potentially increased risk of
mithramycin toxicity in this population.

- Hypersensitivity to plicamycin (mithramycin)

- Requirement for any of the contraindicated medications: nonsteroidal
anti-inflammatory drugs, aspirin, dextran or other iron containing solutions (due to
incompatibility), dipyridamole, sulfinpyrazone or valproic acid

- Patients who in the opinion of the investigator may not be able to comply with the
safety monitoring requirements of the study.

- Patients receiving concurrently other therapies directed at their cancer.