The purpose of this study is to compare, in patients with prostate or breast cancer, the accuracy of 18F-NaF PET imaging to 99mTc whole body bone scans with single-photon emission computed tomography (SPECT).

Technetium-99m (99mTc) is the most widely used radionuclide in diagnostic nuclear medicine studies. It is used in 20 million diagnostic procedures worldwide annually. It became popular as a radioisotope because of its easy availability from a 99Molybdenum (99Mo)/99mTc generator, historic low costs, and previous high availability.

The National Research Universal (NRU) reactor at Chalk River Laboratories (Ontario, Canada) was shut down unexpectedly in May 2009 following a leak of heavy water. The NRU reactor supplied approximately a third of the world's demand of 99Mo for 99Mo/99mTc generators used diagnostic nuclear medicine tests. Given the fragility of 99Mo supply, alternative radiopharmaceuticals, such as 18F-Sodium Fluoride (18F-NaF), are attractive options to replace 99mTc bone scans. Several studies suggest that 18F-NaF may be more accurate and more sensitive in the detection of bone metastases than 99mTc bone scans.

All Subject Inclusion Criteria

• All subjects must have a WHO performance status 0-2.
• Subjects ≥ 18/19 years of age (depending on the age of majority in the province where the trial is conducted)

For Prostate Cancer:

Male subjects requiring a bone scan for evaluation of bone metastasis with one (or more) of the following criteria:

• Symptomatic subjects with clinically suspected bone metastases based on a history of non-joint skeletal pain or non-joint skeletal tenderness on physical examination. The physician must have a high index of suspicion based on history or physical examination, such as night time pain or new onset of pain unexplained by trauma. Such subjects must have a measurable PSA level ≥ 4 ng/mL.
• Subjects with findings on other examinations (such as plain x-ray, CT, MRI or bone scintigraphy and others) that are suspicious for bone metastases but not conclusively diagnostic of bone metastases.
• Asymptomatic subjects with newly diagnosed localized prostate cancer[1] and biopsy Gleason sum 8 -10 (e.g. scores 3+5, 5+3, 4+4, 4+5, 5+4 or 5+5) prior to treatment.
• Asymptomatic subjects with newly diagnosed localized prostate cancer[1] and biopsy Gleason score (4+3) and either PSA level ≥ 20 or palpable disease (cT2b or greater) prior to treatment.
• Asymptomatic subjects with newly diagnosed localized prostate cancer[1] with PSA level ≥ 20 and palpable disease (any cT2 or greater) prior to treatment.
• Asymptomatic subjects with a prior history of treated prostate cancer, and rising PSA, with a PSA doubling time < 6 months, and a minimum PSA level ≥ 4 ng/mL
• Asymptomatic subjects with a prior history of treated prostate cancer, and rising PSA while under androgen deprivation therapy, with a clearly measurable PSA doubling time < 6 months (treatment does not need to be discontinued for eligibility).

Notes:

[1] Subjects with newly diagnosed prostate cancer who receive androgen deprivation therapy, for a duration of < 6 months at the time of enrolment, prior to radiation therapy or surgery, remain eligible to participate in this study if they meet these inclusion criteria.

For Breast Cancer:

Subjects (male or female) requiring a bone scan for evaluation of bone metastasis with one (or more) of the following criteria (19-23):

• Symptomatic subjects with clinically suspected bone metastases based on a history of non-joint skeletal pain or non-joint skeletal tenderness on physical examination. The physician must have a high index of suspicion based on history or physical examination, such as night time pain or new onset of pain unexplained by trauma.
• Subjects with findings on other examinations (such as plain x-ray, CT, MRI or bone scintigraphy and others) that are suspicious for bone metastases but not conclusively diagnostic of bone metastases.
• Asymptomatic subjects with newly diagnosed extra-skeletal metastatic breast cancer (stage IV).
• Asymptomatic subjects with elevated serum cancer antigen (CA) 15.3 or alkaline phosphatase and newly diagnosed locally advanced breast cancer (Stage III).
• Asymptomatic subjects with nodal or extra-skeletal metastatic relapse during follow-up after curative-intent therapy.
• Asymptomatic subjects with new elevation of CA 15.3 or alkaline phosphatase during follow-up after curative-intent therapy.

Subject Exclusion Criteria

• Pregnancy.
• Inability to lie supine for the duration of the imaging studies.
• Subjects previously known for bone metastasis diagnosed by imaging or biopsy.