Melanoma Clinical Trial
Official title:
Tumor Oximetry Using Electron Paramagnetic Resonance (EPR) With India Ink (Using Carbon Particulates From Carlo Erba [CE])
It has been well established that malignant tumors tend to have low levels of oxygen and that
tumors with very low levels of oxygen are more resistant to radiotherapy and other
treatments, such as chemotherapy and immunotherapy. Previous attempts to improve response to
therapy by increasing the oxygen level of tissues have had disappointing results and
collectively have not led to changing clinical practice. Without a method to measure oxygen
levels in tumors or the ability to monitor over time whether tumors are responding to methods
to increase oxygen during therapy, clinician's reluctance to use oxygen therapy in usual
practice is not surprising.
The hypothesis underlying this research is that repeated measurements of tissue oxygen levels
can be used to optimize cancer therapy, including combined therapy, and to minimize normal
tissue side effects or complications. Because studies have found that tumors vary both in
their initial levels of oxygen and exhibit changing patterns during growth and treatment, we
propose to monitor oxygen levels in tumors and their responsiveness to hyperoxygenation
procedures. Such knowledge about oxygen levels in tumor tissues and their responsiveness to
hyper-oxygenation could potentially be used to select subjects for particular types of
treatment, or otherwise to adjust routine care for patients known to have hypoxic but
unresponsive tumors in order to improve their outcomes.
The overall objectives of this study are to establish the clinical feasibility and efficacy
of using in vivo electron paramagnetic resonance (EPR) oximetry—a technique related to
magnetic resonance imaging (MRI)—to obtain direct and repeated measurements of clinically
useful information about tumor tissue oxygenation in specific groups of subjects with the
same types of tumors, and to establish the clinical feasibility and efficacy of using
inhalation of enriched oxygen to gain additional clinically useful information about
responsiveness of tumors to hyper-oxygenation. Two devices are used: a paramagnetic charcoal
suspension (Carlo Erba India ink) and in vivo EPR oximetry to assess oxygen levels. The ink
is injected and becomes permanent in the tissue at the site of injection unless removed;
thereafter, the in vivo oximetry measurements are noninvasive and can be repeated
indefinitely.
The study design uses consecutively enrolled patients. Patients can participate as long as
they are willing, fit the criteria for being assigned to a cohort, and the India ink spot
remains measurable by EPR. Patients whose ink spot is resected during usual care and who do
not have or are not willing to obtain additional injections will be withdrawn. Otherwise,
patients can be re-measured using the previously injected ink at any time during the course
of the study.
The study is split into four cohorts, with a minimum of 1-5 patients expected to be enrolled
annually in each cohort, and a total of approximately 10 subjects expected for each cohort.
The cohorts are defined by the type of tumor and by scenarios when our measurements will be
made relative to the patient's standard therapies: 1) intraoral tumors with planned resection
and adjuvant radiation therapy; 2) cutaneous malignant tumors receiving surgical resection
only, receiving radiation therapy only, or receiving both surgical resection and adjuvant
radiation therapy; 3) breast tumor receiving radiation therapy following surgery; and 4)
other tumors receiving radiation therapy. The diagnosis for patients in all cases assumes
that an eligible tumor (or the postsurgical area receiving radiation) occurs within
approximately one-half centimeter of the surface, as determined by physical exam or imaging
if available. All potentially eligible subjects are approached by their treating physician;
those who agree to be contacted and are subsequently consented are assigned to the cohort for
which they qualify. There is no randomization and no stratification within the cohorts.
Our interest in in situ tumor oxygenation relates to the clinical need to measure oxygen in
tumors prior to therapy, to understand tumor oxygen dynamics over the course of therapy, and
to assess the effectiveness of oxygen modulation therapy during treatment. Our interest in
the postsurgical radiation field relates to the clinical need to understand whether the
temporal dynamics of oxygen within the postsurgical radiation field has the potential to
enhance the effectiveness of adjuvant therapies, and to understand how changes in short and
long term oxygenation within the postsurgical radiation field may facilitate diminishment of
late side effects from surgery and/or radiotherapy.
Following enrollment in the study, each subject will receive an initial placement of one or
more geographically separate injections of India ink into the tissue of interest (i.e., tumor
and/or tumor bed and/or adjacent tissue) using the established procedures for the injection
of the ink. The subject is expected to agree to periodic measurements of all injection sites
(unless the ink injection has been surgically removed); the subject will be told to expect
six or more visits for measurements during treatment, but must agree to have at least one
measurement per injection site. Each measurement will typically consist of 3 ten minute
consecutive periods during which the subject initially breathes room air, then 100% oxygen
delivered through a non-rebreather face mask followed by a period breathing room air.
Patients will be evaluated during clinical and oximetry appointments with respect to the
presence of any adverse events.
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