Breast Cancer
Conditions
Keywords
Fluorescence Imaging, Breast Tumor Margins, Real-time Assessment
Brief summary
Breast cancer is the most commonly occurring cancer in women. Currently, breast conservation surgery (BCS) is the treatment most often prescribed. BCS involves removing the tumor while conserving the greatest amount of healthy breast tissue. Under standard white light, tumor borders are difficult for the surgeons to visualize. Therefore, between 30-70% of patients require a second operation to remove remaining cancerous tissue that wasn't detected during the initial surgery. Thus, there is an urgent clinical need for a new imaging tool that improves tumor visualization during the first surgery. PRODIGI, a new hand-held optical imaging device, uses a safe violet-blue light to detect fluorescence signals in the tissue. Different tissues are associated with specific fluorescent colors and therefore the device can be used to differentiate between tumor and healthy breast tissue. Based on previous clinical data, PRODIGI can distinguish some tumors from normal tissues, but is not specific enough to detect a difference across all breast tumor types. The fluorescent contrast drug 5-aminolevulinic acid (5-ALA) accumulates in tumors naturally and previous research has shown that 5-ALA increases tumor-normal tissue fluorescence contrast. In this observational clinical study, PRODIGI and 5-ALA will be used to visualize tumor borders during BCS. 5-ALA induced fluorescent images from the surgical sample and the surgical bed obtained by PRODIGI will be compared retrospectively with the images taken under standard white light and/or autofluorescence. The technology's ability to accurately identify tumor borders better than conventional practice will be confirmed by tissue pathology.
Detailed description
The investigators hypothesize that 5-ALA will selectively increase breast tumor-to-normal fluorescent contrast and therefore increase tumor margin delineation using the PRODIGI device compared to standard white light or autofluorescence visualization. The goal of this observational study is to use intraoperative fluorescence imaging across all three patient cohorts (control, 15mg/kg 5-ALA, 30mg/kg 5-ALA) to determine if there is an increase in tumor-specific fluorescence contrast, and to select the optimum 5-ALA contrast agent dose. All patients across each cohort will receive conventional BCS and care independent of contrast agent dose. Data from this preliminary study will be used to guide the design of future statistically powered randomized controlled trials involving PRODIGI and 5-ALA. However, at this early stage our initial aim is to develop a baseline understanding of the 5-ALA fluorescent signatures in normal and tumor breast tissues in the surgical setting. This technology has the potential to guide surgeons during BCS and reduce the re-incision rates by ensuring that the surgeons can properly identify tumor from normal tissue during surgery. If successful, this new fluorescence imaging technology may improve patient outcomes by reducing the likelihood of cancer recurrence, accelerating the recovery process and decreasing healthcare costs by eliminating the need for a second surgery.
Interventions
None listed
Sponsors
University Health Network, Toronto
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
FEMALE
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
1. Female patients with breast cancer 2. 18 years or older 3. Have consented for their standard surgeries for primary invasive breast cancers, with or without auxiliary procedure. 4. Have existing biopsies banked at the hospital (for ALA patients)
Exclusion criteria
1. Pre-operative therapy (including chemotherapy, endocrine therapy and radiotherapy) 2. Inability to consent 3. Prior history of photosensitivity, liver disease, or recurrent disease 4. Pregnancy 5. Absence of in-house core biopsy in tissue bank
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| The sensitivities and specificities for the two (oral) doses of 5-ALA (15 mg/kg and 30 mg/kg) and control (0 mg/kg ALA) in differentiating cancer/normal tissue. | The fluorescence and white-light images will be evaluated and compared to histopathology within an average of 2 months after the surgery. The sensitivities and specificities will be calculated within 4 months of achieving a full dataset (45 patients). | The sensitivity and specificity of fluorescence imaging for differentiating cancer from normal tissue in the breast will be evaluated by tissue histopathology and compared to standard white-light imaging. The sensitivities and specificities for auto-fluorescence (Cohort 1: 0 mg/kg 5-ALA) will be compared to the sensitivities and specificities of the two doses of 5-ALA (Cohort 2: 15mg/kg and Cohort 3: 30mg/kg). In addition, the sensitivities and specificities between the two 5-ALA dosing cohorts will be compared. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| A catalogue of the fluorescence signatures associated with the major tissue biological components comprising the breast (e.g. adipose, connective, etc.). | The fluorescent signatures will be compared to biological components within an average of 2 months after each surgery. The fluorescence catalogue will be created within approximately 4 months of achieving a full dataset (45 patients). | The fluorescent signatures from punch biopsies taken from the tumour and in normal tissue will be determined using fluorescence point spectroscopy. The biological components of the corresponding punch biopsies will be determined by tissue histopathology. The fluorescence signatures of the different types of tissue (adipose, connective, etc.) will be correlated for all punch biopsies taken as part of the study. |
Countries
Canada
Contacts
Primary ContactRalph S DaCosta, PhD
Outcome results
None listed