Lymphoscintigraphy detecting alterations of upper limb lymphatic flow following early sentinel lymph node biopsy in breast cancer
Authors Sarri AJ, Tinois da Silva E, Vieira RAC, Koga KH, Cação PHM, Sarri VC, Moriguchi SM
Received 31 December 2016
Accepted for publication 15 March 2017
Published 19 April 2017 Volume 2017:9 Pages 279—285
Checked for plagiarism Yes
Review by Single-blind
Peer reviewers approved by Dr Amy Norman
Peer reviewer comments 2
Editor who approved publication: Professor Pranela Rameshwar
Almir Jose Sarri,1 Eduardo Tinois da Silva,2 Rene Aloisio da Costa Vieira,3 Katia Hiromoto Koga,2 Pedro Henrique Moriguchi Cação,4 Vitor Coca Sarri,5 Sonia Marta Moriguchi2
1Department of Physical Therapy, Barretos Cancer Hospital, Barretos, Sao Paulo, 2Department of Tropical Diseases and Diagnostic Imaging, Botucatu Medical School, Sao Paulo State University – UNESP, Botucatu, 3Department of Mastology and Reconstructive Surgery, Barretos Cancer Hospital, Barretos, 4Department of Radiology – Faculdade de Medicina de São José do Rio Preto (FAMERP), 5Medical School, University of Franca, Sao Paulo, Brazil
Purpose: To evaluate early variations in lymphatic circulation of the arm pre- and post-sentinel lymph node biopsy (SLNB) and conservative breast surgery by lymphoscintigraphy (LS).
Patients and methods: Between 2005 and 2012, 15 patients underwent LS before and after the SLNB (total=30 studies). The pre-SLNB study was considered the control. Early images within twenty minutes (dynamic and static images) and delayed images within ninety minutes of arms and armpits were acquired using a gamma camera. The LS images before and after the SLNB of each patient were paired and compared to each other, evaluating the site of lymphatic flow (in the early phase) and identifying the number of lymph nodes (in the late phase). These dynamic images were subjected to additional quantitative analysis to assess the lymphatic flow rate using the slope assessed by the angular coefficient of the radioactivity × time curves in areas of interest recorded in the axillary region. The variations of lymphatic flow and the number of lymph nodes in the post-SLNB LS compared to the pre-SLNB LS of each patient were classified as decreased, sustained or increased. The clinical variables analyzed included the period between performing the SLNB and the subsequent LS imaging, age, body mass index, number of removed lymph nodes, type of surgery and whether immediate oncoplastic surgery was performed.
Results: The mean age was 54.53±9.03 years (36–73 years), the mean BMI was 27.16±4.16 kg/m2 (19.3–34.42), and the mean number of lymph nodes removed from each patient was 1.6±0.74 (1–3). There was significant difference in the time between surgery and the realization of LS (p=0.002; Mann–Whitney U test), but in an inverse relationship, the higher was the range, the smaller was the lymphatic flow, indicating a gradual reduction of lymphatic flow after surgery (Spearman’s p=0.498, with p=0.013).
Conclusion: Upper limb lymphatic flow gradually decreased after the SLNB and conservative breast surgery in this study, but these results are exploratory because of the small sample size. Further studies are needed to confirm and to investigate more in depth these findings.
Keywords: lymph node sentinel biopsy, lymphoscintigraphy, nuclear medicine, lymphedema, breast cancer
Breast cancer is one of the most common causes of death in women, with increasing incidence in developed and developing countries.1 It requires more aggressive and costly treatments in advanced stages,2,3 which can cause more immediate or delayed posttreatment complications, including bleeding, infection, seroma, axillary web syndrome, chronic pain, paresthesia due to intercostal brachial nerve injury, decreased range of motion and muscle weakness in the shoulder and, especially, lymphedema.4,5 The latter is the largest and most important morbidity,6,7 with increased incidence when associated with complementary radiation therapy.8–10
Lymphedema is difficult to diagnose, especially in the early stages.9,11 It is incurable when established. Studies show that surgery and drug therapies are unsuccessful,12,13 although lymphedema may be avoided, treated and controlled by daily preventive measures.14,15 Improper diagnosis always causes delayed therapy and at a more advanced stage of morbidity. Early treatment leads to fast improvement and prevents lymphedema progression.9,16
Lymphedema prevention has been attempted using more conservative intraoperative methods of approach to the axillary chain, including the sentinel lymph node biopsy (SLNB). The authors have introduced innovative methods in recent decades, accounting for a new standard of care for early-stage patients.17,18 These improvements enable selective, safer and less mutilating resections with satisfactory results and a substantial reduction of surgical morbidity,19,20 albeit restricted to patients with clinically negative axilla.21,22
The sentinel lymph node (SLN) is the first node receiving lymphatic drainage from the primary tumor.23,24 Increasing focus on morbidity triggered by axillary lymph node dissection (ALND) and toward increasing the capacity of detection of small tumor cells in the SLN have increased the indication of SLNB25 because this method is safe and less invasive, with reduced treatment costs.26,27
The primary goals of SLNB were to generate information on the stage of the axillary chain and to avoid unnecessary axillary dissection, decreasing upper limb morbidities. These morbidities are lesser in SLNB than in ALND,28–30 improving the patient’s quality of life.31 Although the application of SLNB has increased, its use reduces but does not eliminate the risk of developing lymphedema,32,33 with the incidence ranging from 0% to 15.8%.34–36 The transection of arm lymph vessels during SLNB37,38 and obesity38,39 may trigger lymphedema. Britton et al40 also found a small number of patients with a coincidental SLN draining the breast and upper limb, the removal of which causes the disruption of lymphatic drainage of the upper limb, consequently increasing the risk of developing lymphedema. Several authors are using axillary reverse mapping to avoid injuring coincidental lymph vessels.41–44
Lymphoscintigraphy (LS) is an available, inexpensive, easily performed, low-morbidity complementary imaging method. It is based on the principle that radiocolloids and radiolabeled macromolecules of appropriate size and properties injected in the interstitial tissue reach afferent lymph vessels and are transported to lymph nodes, mapping the lymphatic system. Colloids labeled with 99mTc are the most used radiotracers and can effectively assess the lymph systems of the upper and lower limbs, although most publications focus their lymphatic studies on the lower limbs.33,45 The introduction of nuclear medicine concept in mastology for SLN identification is widespread. The use of vital dyes or radiopharmaceuticals alone or in combination is very effective for the accurate identification of lymph nodes.46–48
LS of the upper limbs after mastectomy was used to evaluate treatment efficacy after physical therapy of the arm with lymphedema already established. Recently, we conducted a study to assess lymph flow in the upper limbs with and without physical therapy stimulation in recently mastectomized patients submitted to ALND and without lymphedema. LS effectively illustrated the improvements in poststimulation lymph flow, directing early physical therapy behaviors in the group of patients at potential risk of developing late lymphedema.49 We have found no evidence for evaluation of the lymphatic circulation following immediate conservative breast surgery with SLNB in the literature.
The objective of this study was to evaluate early variations in lymphatic circulation of the arm pre- and post-SLNB and conservative breast surgery by LS.
Patients and methods
This longitudinal observational study included 26 patients aged >18 years with unilateral breast cancer who were submitted to SLNB between 2005 and 2012. A total of 11 patients were excluded, including four submitted to ALND during surgery, given the identification of lymph node metastases in the biopsies, two with no good quality of LS images and five who withdrew their consent during the study. The final sample consisted of 15 patients who underwent LS before and after the SLNB for a total of 30 studies; the pre-SLNB study was considered the control. None of the patients submitted to previous chemotherapy or radiation therapy with knowledge of lymphatic pathology prior to SLNB and with the presence of inflammatory or infectious processes associated with the upper limbs were included. The patients were informed about the study and freely signed the informed consent form; the study received approval from the Research Ethics Committee of Barretos Cancer Hospital, Brazil.
LS images were acquired and processed according to the protocol proposed by Sarri et al49 using a two-headed, low-energy collimator and high-resolution nuclear gamma camera (GE Medical Systems Israel Ltd, Millennium VG Hawkeye, Tirat Hacarmel, Israel), with acquisition of early images of the arms and armpits (dynamic phase [DYNAMIC] – one frame/minute for 20 minutes); the static immediate phase (STATIC, images of the arms and axillary regions for 10 minutes each) started immediately after the dynamic phase, and the delayed-phase whole-body scan (WBS) images were acquired 90 minutes after the injection of 0.5 mL of 37 MBq (99m)Tc-phytate (Nuclear and Energetic Research Institute – IPEN, FITA-TEC fitato de sódio [99m Tc], São Paulo, Brazil), which was administered subcutaneously (fan technique) into the second interdigital space.49 The LS images before and after the SLNB of each patient were paired and compared to each other, evaluating the site of lymphatic flow (in the early phase) and identifying the number of lymph nodes (in the late phase). The sequential ordinal classification from the injection site in the hand to the farthest site reached, which ranged from 0 to 14, as proposed by Sarri et al49 and as shown in Figure 1, was used to locate the site of the afferent lymphatic inflow junction in the upper limb. The dynamic images were subjected to additional quantitative analysis to assess the lymphatic flow rate using the slope assessed by the angular coefficient of the activity × time curves in areas of interest recorded in the axillary region.49 The variations of lymphatic flow and the number of lymph nodes in the post-SLNB LS compared to the pre-SLNB LS of each patient were classified as decreased, sustained or increased.
Figure 1 Lymphoscintigraphy including the area from the hand to the abdominal region.
Notes: Sequential ordinal classification of the site reached by lymphatic flow from the injection site (minimum classification) to the spleen (maximum classification). Reprinted with permission from Spandidos Publications UK Ltd. Sarri AJ, Moriguchi SM, Dias R, et al. Physiotherapeutic stimulation: early prevention of lymphedema following axillary lymph node dissection for breast cancer treatment. Exp Ther Med. 2010;1(1):147–152. Copyright © 2010, Spandidos Publications.49
The mean age of the analyzed sample (n=15) was 54.53±9.03 years (36–73 years), the mean body mass index (BMI) was 27.16±4.16 kg/m2 (minimum – maximum: 19.3–34.42), and the mean number of lymph nodes removed from each patient was 1.6±0.74 (minimum – maximum: 1–3).
The tumors were predominantly in the left breast (n=11; 73.4%) compared to the right breast (n=4; 26.0%). Quadrantectomy was the procedure of choice (n=13; 86.0%), followed by simple mastectomy (n=2; 14.0%). An immediate oncoplastic surgery was performed in three patients.
Comparisons between the site of the afferent lymphatic inflow junction and the total number of lymph nodes identified and the subsequent classifications into decreased, sustained or increased for each group of images were made after pairing the dynamic, static and WBS images from the pre- and post-SLNB studies of each patient. Only two subgroups were formed for statistical analysis purposes: patients with decreased (decreased group, DG) versus patients with sustained/increased (sustained/increased group, SIG) lymphatic flow and number of lymph nodes post-SLNB. The clinical variables analyzed included the period between performing the SLNB and the subsequent LS imaging, age, BMI, number of removed lymph nodes, type of surgery and whether immediate oncoplastic surgery was performed.
Dynamic image analysis identified eight patients with decreased (DG=8) and seven with sustained/increased lymphatic flow rates (SIG=7). No statistically significant differences were observed between the variables, as shown in Table 1. Both patients submitted to simple mastectomy showed a decreased lymphatic flow rate, seven of the 13 patients submitted to quadrantectomy showed an increased lymphatic flow rate and six showed a decreased rate without significant lymphatic variation associated with the surgical approach (p=0.467, Fisher’s exact test). The lymphatic flow rate increased after the SLNB in the three patients submitted to immediate oncoplastic surgery, which proved to be a key factor (p=0.07, Fisher’s exact test).
Analysis of the static image (STATIC) revealed a significant difference between DG (n=6) and SIG (n=9) with regard to the variable site of the afferent lymphatic inflow junction and the time period between the SLNB and the post-SLNB LS scan (p=0.002, Mann–Whitney U test), albeit in an inverse relationship: the longer the period is, the smaller the site of the afferent lymphatic inflow junction will be, indicating a gradual decrease of lymphatic flow post-SLNB (ρ=−0.498, with p=0.013; Spearman’s rank correlation coefficient – Spearman’s ρ). No statistically significant differences were noted in that image regarding the other variables analyzed, as shown in Table 2. The representative figure depicts the data in a box plot (Figure 2).
When analyzing the clinical variables, no statistically significant differences were observed between the subgroups formed using the criterion decreased (DG) versus sustained/increased (SIG) variation of the total number of lymph nodes identified in each study phase. One to three axillary lymph nodes were identified, although the uptake intensity changed in WBS images.
An SLNB in patients submitted to early-stage breast cancer treatment is a strategy to minimize the risk of morbidities associated with therapy, primarily upper limb lymphedema.3,4,50 Currently, the decrease in practice of ALND after positive SLN for micrometastases or an isolated tumor suggests that ALND is more prognostic than therapeutic.51–53 Although SLNB reduces the risk of developing lymphedema, other factors, including disruption of arm lymphatic vessels37,38 and obesity,38,39 may lead to the onset of this condition, especially when associated with adjuvant radiation therapy.8,9 McLaughlin et al54 verified that 50% of patients submitted to SLNB were concerned with the development of lymphedema, in contrast to 75% of those submitted to ALND in their study. This concern is understandable in this group of patients, although it is unfounded in the SLNB group, given the low risk of developing lymphedema. Our study showed no early change in lymphatic flow related to BMI.
Nuclear medicine technology has a key role in the evaluation of the lymphatic system.55 Considering the system’s complexity, X-ray images remain a challenge because the lymphatic system is not an organ; instead, it connects different structures from small lymphatic capillaries to main ducts through lymph nodes and valves. Thus, each of those structures may be visualized in separate images from each other. The lymphatic system may also be involved in various diseases, including cancer and infectious diseases.33,56 This study chose to analyze lymphatic circulation by LS for recording physiological changes at different time periods following radiopharmaceutical injection to map lymph flow until reaching lymph nodes with immediate and delayed images. The visualizations of both the total number of evidenced lymph nodes and more axillary lymph nodes were also more representative in the most delayed images, corroborating the study by Sarri et al;49 the authors showed that the acquisition time determined the site of the afferent radiopharmaceutical inflow junction, identifying more lymph nodes in delayed images in patients with breast cancer submitted to surgery and axillary lymphatic approach. The inclusion of the quantitative analysis of the lymphatic flow rate using the angular coefficient (slope) aimed to identify small and still unnoticeable changes in the images and also to minimize errors of subjective interpretations in the qualitative analysis. Celebioglu et al57 used LS with qualitative and quantitative analyses to monitor patients submitted to SLNB. The second examination was performed 2–3 years after surgical treatment and radiation therapy, comparing the operated with non-operated arms, and no differences were detected between the limbs. We have found no other similar studies in the literature, with the exception of the study described above, conducted by Sarri et al.49 The three patients in our study who were submitted to immediate oncoplastic surgery exhibited an increased lymphatic flow rate in the early postoperative period. The compensation of lymphatic flow into the inflammatory area should be considered.58 The lymphatic system serves a key immunological function during the inflammatory process, promoting the influx of immune cells and specific antigens and draining into the lymph nodes with an increased drainage volume.59,60 We have found no studies for comparison that are similar to ours that assess the lymphatic circulation in the immediate pre- and postsurgical period of patients submitted to SLNB. Patients submitted to prophylactic mastectomy on whom SLNB was performed showed no significant increase in the risk of developing lymphedema.61 Further studies using early and delayed postsurgery LS imaging should be conducted to identify the actual damage from SLNB to the lymphatic flow, especially when combined with more extensive breast surgery, including oncoplastic surgery.
This study showed no variation in the total number of lymph nodes identified pre- and post-SLNB. Probably, it can be explained by the small number of patients with a coincidental SLN draining the breast and upper limb, as described by Britton et al,40 and that will not have an impact on the development of late lymphedema. Perhaps, the association of many studies, including axillary reverse mapping too, can avoid injuring coincidental lymph vessels41–44 and identify patients who may benefit from early physiotherapeutic stimulation49 after SLNB.
We have observed that the period between the SLNB and the LS was crucial to identify any variations in lymphatic flow, and that the period had an inverse relationship with flow: the longer the period between the SLNB and the monitoring of LS imaging is, the lower the lymphatic flow will be. These findings are exploratory. We studied only one patient following SLNB later. The lymphatic flow was evaluated at three different time periods by LS. The first scintigraphy was performed 15 days before the surgical procedure. The second examination was performed 22 days after surgery and the third one 6 months later. The immediate postoperative scintigraphy showed that the intensity of radiopharmaceutical uptake increased in the axillary lymph node, but the late postoperative study (6 months) showed a relatively lower uptake in this lymph node compared to the two previous studies. Maybe, these findings can be related to the acute inflammatory process after local manipulation and damage to the lymphatic chain in early postoperative evaluation and fibrosis in later evaluation. Further studies, focusing on different time periods between the SLNB and the LS combined with limb measurement, should be conducted to identify the actual impact of such a finding on conservative surgery. It would be important to assess which is the right timing to perform the lymphoscintigraphic study of the upper limb after conservative breast surgery and SLNB, in order to have the greater prognostic value in patients with an increased risk of lymphedema, such as obesity and radiotherapy.
Upper limb lymphatic flow gradually decreased after an SLNB in this study, but these results are exploratory because of the small sample size. Further studies are needed to confirm and to investigate more in depth these findings.
AJ Sarri is the father of VC Sarri. SM Moriguchi is the mother of PHM Cação, and they are both physicians in diagnostic imaging.
All authors contributed toward data analysis, drafting and critically revising the paper, gave final approval of the version to be published, and agree to be accountable for all aspects of the work.
The authors report no conflicts of interest in this work.
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