Chronic Pain Clinical Trial
Official title:
A Prospective, Randomized Study of the Possible Pain Relieving and Scar Tissue Modifying Properties of Lipotransplantation in a "Post Breast Therapy Pain Syndrome" Setting
Background
In Denmark, breast cancer is the most common fatal cancer in women with more than 4700 new
cases annually. Unfortunately, up to 60% of women who are treated surgically for breast
cancer, will experience chronic pain as a consequence of the treatment. This state of
chronic neuropathic pain is termed "Post Breast Therapy Pain Syndrome" or PBTPS.
The purpose of the study
The purpose of this study is to investigate whether transplantation of fat cells
(lipotransplantation) to the pain affected mastectomy area, could have an analgesic effect
in women who have developed PBTPS. Secondary, we wish to investigate if lipotransplantation
has a beneficial effect on the quality of the skin and the scar in the area where the
transplanted fat cells are placed.
Hypotheses
- Lipotransplantation to the area under the scar tissue and the area under the
pain-afflicted area reduces the pain in women with PBTPS.
- The neuropathic pain in PBTPS is correlated to the number of free nerve endings
crossing the border between the dermis and the epidermis
- Lipotransplantation have a beneficial effect on the scar tissue structure and improves
the skin quality.
Patients
Women who have undergone treatment for breast cancer and subsequently developed PBTPS. A
total of 32 patients with PBTPS will be included.
Methods
Patients will be randomly assigned to receive either lipotransplantation or no active
treatment. At three follow-up visits, the perceived pain of the patient and the skin and
scar quality will be scored. In addition, a 3-mm biopsy will be taken from the skin on both
the missing and the healthy breast, and from the mastectomy scar.
The scoring of the perceived pain and the quality of the skin and the scar, allows us to
investigate if the lipotransplantation have an effect on pain, and skin/scar quality.
Additionally, the skin and scar biopsies will be examined on a microscopic level, in order
to investigate why lipotransplantation has these effects.
Conclusion
In summary, the results of this project could help to increase our understanding of why some
patients develop chronic neuropathic pain after mastectomy and radiotherapy. It is our hope
that our results may contribute to the development of better and more effective treatment
that will be beneficial for the project participants and future patients.
Background
In Denmark, breast cancer is the most common fatal cancer in women with more than 4700 new
cases annually. All patients are treated according to national guidelines developed by the
Danish Breast Cancer Cooperative Group (DBCG). Treatment primarily consists of surgical
removal of all or parts of the breast and simultaneous removal of one-or lymph nodes in the
ipsilateral axilla. Subsequently, there may be a need for additional treatment with
chemotherapy, radiation and / or anti-hormonal therapy, in order to reduce the risk of
recurrence.
Up to 60% of women who are treated surgically for breast cancer, will experience chronic
pain as a consequence of the treatment. This condition was previously referred to as "Post
Mastectomy Pain Syndrome", but because the condition is also seen after less extensive forms
of breast cancer surgery, the condition is now termed "Post Therapy Breast Pain Syndrome"
(PBTPS). PBTPS is defined as a neuropathic pain condition with pain localized to the axilla,
the medial part of the upper arm, chest and or chest wall of the side of surgery, lasting
more than three months after surgery and / or the end of treatment.
In 2011 Caviggioli et al. published a study where lipotransplantation to the mastectomy area
was found to have a significant analgesic effect. The aforementioned study is to date the
only published study in the field. However, it is not a randomized study. In order to obtain
further evidence of the apparent beneficial effect of lipotransplantation on pain, the
present study has been initiated.
Lipotransplantation is a fast and relatively non-invasive technique which is described in
detail by Coleman et al.. Additionally, in a study from 2008, Klinger et al. found that
lipotransplantation to burn scars in the face resulted in a significant improvement in the
patient's skin and scar quality and also reduced pain in the treated areas. The theoretical
basis for the scar and skin modifying effects of lipotransplantation has not yet been
finally understood. To the best of our knowledge, no studies have systematically
investigated and analysed the effects of lipotransplantation on the irradiated mastectomy
area on a histological level.
The purpose of the study
The purpose of this study is to investigate whether lipotransplantation to the pain affected
mastectomy area, could have an analgesic effect in women affected by Post Breast Therapy
Pain Syndrome. Secondary, we wish to investigate the scar and skin modulating effects of
lipotransplantation to the same area.
By carrying out immunohistochemical staining and subsequent stereoscopic microscopy of free
nerve endings in the skin biopsies taken before and after lipotransplantationen we wish to
determine whether changes in the number and type of free nerve endings is part of the
mechanism of pain reduction.
Hypotheses
- Lipotransplantation to the area under the scar tissue and the area under the
pain-afflicted area reduces the pain in women with PBTPS.
- The neuropathic pain in PBTPS is correlated to the number of free nerve endings
crossing the border between the dermis and the epidermis
- Lipotransplantation have a beneficial effect on the scar tissue structure and improves
the skin quality.
Patients
Women who have undergone unilateral mastectomy for breast cancer at Aarhus University
Hospital, Aarhus, Denmark and, if applicable, has finished their adjuvant postoperative
radiation therapy at least 6 months ago. Patients must have had pain localized to the area
of the missing breast for at least three months after adjuvant radiation therapy ended. A
total of 32 patients with PBTPS will be included.
Methods
Patients with PBTPS are randomly assigned to receive either lipotransplantation or no active
treatment.
Regardless of randomization, the patient will be invited to three follow-up visits,
respectively 3 and 6 months after inclusion/surgery. At each of the outpatient visits the
participant will be asked to complete the DoloTest ® , VAS pain score and the Patient Scar
Assessment Scale. The clinician will complete the Observer Scar Assessment Scale and record
the consumption of pain medication. DoloTest ® is a validated, visual analogue questionnaire
designed to assess the patients experienced pain and impact on the patients daily life.
Three 3-mm punch biopsies will be taken at inclusion, one from the mastectomy scar, one from
the skin 2 cm above the mastectomy scar in the medioclavicular line, and one from the
healthy skin on the health breast in an area corresponding to the other skin biopsy.
The skin punch biopsies from the pain afflicted area will be fixed in 4% phosphate buffered
paraformaldehyde. After freezing, the tissue samples are cut into 50-micron thick sections.
Systematically sampled sections immunostained with rabbit anti-human Protein Gene Product
9.5 (a neuron-specific protein), and DAB-marked goat anti-rabbit as the secondary antibody.
The sections are then microscoped in an Olympus BX51 light microscope with an Olympus DP71
digital camera and Prior motorized board connected to a computer with Newcast stereology
software. Two goals can then be calculated: 1) the number of free nerve endings, which
crosses the border between dermis and epidermis per mm 2) the average nerve fibre length
density in the epidermis and / or dermis.
The skin punch biopsies from the mastectomy scar are fixed in formaldehyde for embedding in
paraffin. The tissue samples are cut into 1-2 micron thick sections and stained with
Picrosirius red (PR) colour. By using polarized light microscopy, the various subtypes of
collagen fibres may be visualized and differentiated. The thicker collagen fibres (type I)
are red-orange-yellow and the thinner collagen fibres (type III) are green. Furthermore, the
sections will be stained for elastin. Quantitatively, by means of the above-mentioned
method, changes in the volume fraction of collagen type I and III, and elastin may be
measured.
Statistical analyzes
The minimal clinically relevant difference the study is looking for, is a Visual Analog Pain
score difference of 3. The common standard deviation was estimated from a similar study by
Caviggioli et al. in 2011, and set to be 2.96 on the Visual Analog Pain scale. We assume
that our standard deviation (SD) will be the same. Using the following formula: N = (Za +
Zb)2 x SD2 / dif2 where Za and Zb are the standardized normal deviations corresponding to
the selected levels of significance, SD is Standard Deviation and dif is the minimal
clinically relevant difference the study is looking for. The result is 16 patients in each
arm, totalling 32 patients, when the significance level is set at 5% and the power of the
study is set to 80%. Statistical analyzes will be performed in collaboration with a
biostatistician from the Health Sciences Institution, Aarhus University, Denmark.
Economic Conditions
The project is supported by: Faculty of Health Sciences, University of Aarhus with three
full time equivalents, which is used to pay for full-time academic staff. Other project
expenses are to be covered by independent foundations and endowments that do not have an
influence on the study. None of the personnel in the project have a financial interest in
the project.
Compensation to the participating patients
The participating patients in the study will not receive any financial compensation.
However, documented travel expenses will be reimbursed.
Recruitment of participants
Patients are primarily recruited from a previous study, were a questionnaire was sent to all
women having received an unilateral mastectomy at Aarhus University Hospital, in the period
from 2009 to 2013. In the questionnaire, patients were asked to evaluate their pain in the
different areas pertaining to PBTPS, and if they would allow our department to contact them
in regards to the present study. If patients fulfilled the inclusion criteria, they are
contacted by the primary investigator by telephone, and a meeting were the details of the
study are presented is arranged. Patients with PBTPS could also be recruited during their
routine visits at the department of oncology.
The patients will always be offered at least 24 hours of consideration before deciding to
give written consent to participate in the study. With the signing of the consent form, the
patient accepts the terms and conditions in the study. The patient may at any time and
without justification withdraw her consent to participate, without her decision affecting
her present or future treatment or any other rights the patient may have.
Publication of results
Negative, inconclusive and positive results from the study will be published in
internationally recognized, peer-reviewed, English-language journals with an interest in the
field.
Ethical statement, side effects and risks
In the present project, data will be treated confidentially in accordance with the Danish
Act on Processing of Personal Data. Participants shall be informed both in writing and
orally prior to deciding to participate in the study. The participants are thus fully aware
of the projects purpose, background and methods, as well as what is expected from the
patient's role as a participant.
The participating patients are in the lipotransplantation group, offered an active
treatment, which if the current study program can confirm the foreign study, hopefully
reduces their daily pain and discomfort and thereby also their consumption of analgesia. If
the project provides positive results, the control group will, after the study has ended, be
offered the same active treatment.
The patients, which only after informed consent, is part of the project will, in connection
with:
1. Lipotransplantation in general anaesthesia; only be exposed to the risk associated with
general anaesthesia. The patients in the present study have in relation to their
previous surgery for breast cancer been exposed to one or more interventions in general
anaesthesia.
2. Risks related to the actual lipotransplantation. At the donor site, there is a risk for
short-term tenderness and temporary discolouration. In the long term, a slightly rough
surface of the skin may arise. The advantage of the harvest of the fat graft is that
the patient achieves a visible improvement of the contour at the donor site.
3. The risk related to the skin punch biopsies: apart from a small scar 1-3 mm
corresponding to the place where the biopsy is collected, there is not assessed to any
risk of permanent injury or damage.
All interventions are carried out by experienced specialists in plastic surgery with several
years experience with lipotransplantation. The general anaesthesia is performed by
specialists in anaesthesiology, which are all part of the permanent team at the plastic
surgery department and therefore familiar with providing anaesthesia during the described
procedures.
;
Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment
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