Abstract
In patients with breast cancer surveillance strategies play an important role. The aims of any follow-up are to detect early local recurrence or contralateral breast cancer and to diagnose and treat cancer and/or therapy-related diseases such as metastases and osteoporosis. Mammography every 1–2 years is the only recommended evidence-based imaging modality during follow-up. Current guidelines recommend against routine use of laboratory or imaging tests to detect asymptomatic metastases during staging or follow-up after breast cancer diagnosis. The purpose of this chapter is to address the role and effectiveness of imaging modalities in the staging and surveillance of patients with breast cancer after primary therapy.
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Keywords
FormalPara Learning Objectives-
To learn about the strengths and weaknesses of the different imaging modalities for local surveillance of patients with a personal history of breast cancer.
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To understand that mammography is the only routinely recommended imaging modality with which to detect local recurrence or contralateral breast cancer.
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To discuss the role and effectiveness of imaging modalities in the staging and surveillance of patients with breast cancer after primary therapy.
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To show that there is little justification for imaging to detect metastasis in asymptomatic breast cancer patients.
14.1 Introduction
Breast cancer is the leading cause of cancer-related death among women worldwide, with variable incidence and mortality rates. Fortunately, mortality has decreased because of advances in screening and treatment [1, 2]. The 10-year survival rate of breast cancer ranges from 70 to 80%, with up to 90% for local and 60% for regional disease [3]. The annual hazard of recurrent disease (local and or metastases) ranges between 2 and 5% in years 5–20 after diagnosis. The yield for recurrent disease is likely to be higher in patients with advanced stages of disease [4]. Recent studies have demonstrated that the onset of local recurrence is an independent predictor for survival [5]. Thus management of patients with breast cancer during surveillance plays an important role. The aims of any follow-up are to detect early local recurrence or contralateral breast cancer and to diagnose and treat cancer and/or therapy-related diseases such as metastases and osteoporosis [3]. Considering these facts a well-defined, evidence-based surveillance protocol is needed to manage patients with breast cancer after the initial diagnosis, including staging and follow-up. Currently mammography every 1–2 years is the only recommended evidence-based imaging modality. In asymptomatic patients, there are no data to indicate that any imaging or laboratory test leads to a survival benefit. In symptomatic patients or in case of clinical findings appropriate tests should be performed immediately [3,4,5,6,7,8].
The purpose of this chapter is to address the role and effectiveness of imaging modalities in the staging and surveillance of patients with breast cancer after primary therapy.
14.2 Surveillance Recommendations for Local Recurrence
Local recurrence in breast cancer can be defined as recurrent disease to the ipsilateral breast, chest wall, or regional lymph nodes. Most local recurrences in breast cancer can be treated with curative intent and early detection of local recurrence will improve the overall prognosis of the patients [9]. Overall, the incidence of an ipsilateral breast recurrence (including ipsilateral new primary cancers) in women with spontaneous early-stage breast cancer treated with breast-conserving therapy will be around 0.5–1% per year and may especially in estrogen-receptor-positive tumors remain elevated well beyond 10 years after diagnosis [9, 10]. However, a variety of factors will influence the likelihood and timing of local recurrence. In particular, involved surgical margins, nonadherence to adjuvant therapy guidelines, large size, and aggressive biology of the primary tumor, young patient age at diagnosis, and presence of familial or genetic risk factors may substantially increase recurrence rates.
14.2.1 Surveillance After Breast-Conserving Surgery
The backbone of surveillance of the ipsilateral breast in asymptomatic women with a personal history of breast cancer and who were treated with breast-conserving surgery is mammography [11,12,13]. However, specific recommendations vary substantially between countries and institutions regarding the optimal time to begin of mammographic surveillance after local treatment (e.g., 6–24 months after surgery) and the frequency (from semiannual mammography of the ipsilateral breast during the first 2 or 3 years after surgery to mammography only every 2–3 years) [9]. As sensitivity of mammography in the treated breast may be lower due to posttreatment changes [9], mammography is usually accompanied by a clinical exam and in many European countries by breast ultrasound [3]. This has the advantage that the axilla and regional lymph nodes can be evaluated at the same time. Digital breast tomosynthesis (DBT) has the potential to improve screening accuracy compared to 2D mammography; however data regarding DBT in the follow-up of patients with breast cancer is limited [14]. Contrast-enhanced magnetic resonance imaging (MRI) has the highest sensitivity regarding ipsilateral breast cancer recurrence. MRI is therefore an excellent tool for surveillance of asymptomatic high-risk women with a personal history of breast cancer as well as for problem-solving in otherwise indeterminate cases. However, the available evidence is currently insufficient to recommend for or against MRI as routine surveillance method in all normal-risk women with a personal history of breast cancer [15].
14.2.2 Follow-Up After Mastectomy
Most women treated with mastectomy with or without reconstruction can safely be followed by clinical exam alone or in conjunction with ultrasound. As long as the breast parenchyma has been completely removed during mastectomy, routine mammography on the affected side will not be necessary [16]. However it should be noted that some centers will ignore this advice and perform regular mammography in asymptomatic women after mastectomy with or without reconstruction [17]. If there is suspicion of significant residual breast parenchyma after mastectomy, breast MRI can reliably confirm or exclude residual parenchyma. Ipsilateral remaining breast tissue after mastectomy in women who have not received radiation therapy substantially increases the risk for local recurrence and may require re-excision or careful imaging surveillance [18]. In patients with mastectomy and implant reconstruction, MRI is superior to mammography and palpation regarding detection of recurrent disease [19]. MRI will be especially valuable in cases with prepectoral positioning of the implant to exclude pectoral recurrence behind the implant, as this area will not be accessible to clinical exam and ultrasound.
14.2.3 Imaging Patients with Local Symptoms
Any locoregional symptom such as a palpable lump, new pain, changes in breast configuration, or skin changes in a patient with a personal history of breast cancer should be carefully evaluated by a thorough clinical exam and tailored imaging. Many palpable abnormalities are readily accessible to targeted ultrasound. Additional imaging such as mammography and/or MRI can be added as needed. Positron emission tomography-computed tomography (PET/CT) can be very helpful in cases with suspected axillary recurrence, especially if the findings are not accessible to percutaneous biopsy.
14.2.4 Strengths and Weaknesses of Different Surveillance Methods
14.2.4.1 Clinical Exam
The value of a thorough clinical exam that consists of history-taking, inspection, and palpation of the breast and regional lymph nodes for the detection of local breast cancer recurrences should not be underestimated. Skin changes detected during clinical inspection may be the only sign of a local recurrence around the surgical scar or even for the existence of skin metastases. Palpation of the regional lymph nodes is also an important part of the clinical exam, especially if mammography only (no accompanying ultrasound) surveillance regimes are employed. About half of all ipsilateral breast recurrences will have a positive finding on clinical exam, and about a one-third of ipsilateral breast recurrences will be detected by the clinical exam with negative mammography [9]. This proportion is substantially higher than for healthy women undergoing routine mammography screening. Most guidelines therefore recommend clinical follow-up visits for breast cancer patients in the first 5 years after diagnosis at shorter intervals than the imaging surveillance (e.g., every 3–6 months) [3]. These visits also provide psychological support, motivate to follow adjuvant treatments recommendations, and help to detect treatment related problems early.
14.2.4.2 Mammography
Regular, usually annual mammography is the foundation of every surveillance regime in women after breast-conserving therapy. Ultrasound (US) and/or MRI can be used to supplement, but not to replace mammography in this situation. Between 50 and 80% of ipsilateral breast recurrences will be detectable by mammography. Key to this is the detection of suspicious microcalcifications by mammography, often an early sign of residual or recurrent disease (Fig. 14.1). High breast density as well as postoperative changes such as hematoma, seroma, fat necrosis, or scarring may reduce the sensitivity of mammography. There is hope that DBT will be able to overcome these limitations at least in part, by reducing problems due to superposition.
Key Point
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The detection of suspicious microcalcifications by mammography plays a crucial role in the early detection of not only in situ but also invasive ipsilateral breast cancer recurrence.
14.2.4.3 Ultrasound
Breast US is an ideal complementary technique to the clinical exam and mammography. It enables direct correlation with and work-up of clinical as well as mammographic findings. In addition, US is able to evaluate the chest wall or the reconstructed breast after mastectomy. Breast ultrasound is also an excellent tool to evaluate the regional lymph nodes. In contrast to mammography, the detection performance of US is not affected by dense breast tissue. The main limitation of US is the high number of non-specific or false-positive findings, although this is less of a problem if US is performed on a regular basis during follow-up.
14.2.4.4 MRI of the Breast
MRI of the breast has by far the highest sensitivity for invasive breast cancer of all available imaging modalities. This translates into a very high negative predictive value approaching 100% and makes MRI the ideal problem-solving tool. If no relevant contrast enhancement is found on MRI in the area of an equivocal clinical, mammographic, or sonographic finding, clinically relevant changes can be excluded with sufficient certainty, and the patient can safely be placed on short-term follow-up. With the exception of the immediate postoperative phase, MRI can also reliably differentiate between postoperative changes/scarring and recurrence. However, it is important to realize that local recurrence may lack typical malignant features at imaging such as irregular borders or rapid contrast uptake on MRI. Therefore histological confirmation, if necessary by open excisional biopsy, is advisable for all new solid lesions with enhancement on MRI (Fig. 14.2). The disadvantage of MRI is that many otherwise occult benign breast changes (including high-risk lesions) will also show enhancement on MRI. For MRI to have the highest benefit in routine surveillance/screening, the underlying incidence of malignant changes has to be high enough, or the positive predictive value of an abnormal MRI finding will be too low. This is the reason why routine surveillance with MRI is currently recommended only in the high-risk setting [15].
Key Point
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Any new solid enhancing lesion in the ipsilateral breast or chest wall should be considered suspicious for recurrence regardless of size, morphology, or enhancement characteristics.
14.2.4.5 Other Imaging
Contrast-enhanced mammography is an emerging technology, which may serve as an alternative if MRI cannot be performed (e.g., due to claustrophobia). Positron emission technologies such as PET/PEM are not recommended for routine surveillance of the breast due to the relatively high associated radiation dose associated with these modalities. However, PET/CT may be helpful in the evaluation of a possible regional lymph node recurrence or if there is the possibility of additional distant metastasis.
14.3 Imaging of Distant Metastases
14.3.1 Initial Staging
Once breast cancer is diagnosed, staging of the axilla must be performed. Currently, sentinel lymph node biopsy is recommended because imaging is not accurate enough [7]. Several guidelines recommend against the routine use of imaging modalities to stage asymptomatic metastases in newly diagnosed breast cancer [4]. Modern imaging technologies have improved the detection capability; thus the current NCCN guidelines [8] recommend against routine staging of patients with stage I and II disease but recommend CT (lung plus abdomen) or MRI (abdomen/liver) in addition to bone scintigraphy for stage III and IV disease. The use of FDG-PET/CT is viewed with caution though several studies demonstrate more accurate breast cancer staging with PET/CT. The use of FDG-PET/CT changed the clinical stage in 30% and found unsuspected metastases in 21% of patients with stage IIA and IIIC disease. Particular in younger patients (<40 years of age), an upstaging of 17% was seen in stage IIB disease [20]. Even more in bone metastases FDG-PET/CT outperforms CT or bone scintigraphy, with accuracies of up to 90%. The role of PET/CT may be less clinically relevant in extensive metastatic disease; however there are cases where a single metastasis is detected which affects the prognosis and the therapy (Fig. 14.3). The results of FDG-PET/CT are excellent; however it should be noted that its utility depends on cancer type being less sensitive in lobular breast cancer disease. Nevertheless it can be expected that PET/CT with more specific tracers than FDG will enhance the ability to stage breast cancer more accurately and will allow better prediction and assessment of treatment response during targeted therapy [7].
Key Point
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NCCN guidelines recommend against routine staging of patients with stage I and II disease but recommend CT or MRI in addition to bone scintigraphy for stage III and IV disease [8].
14.3.2 Distant Metastases
Distant recurrence (metastasis) is the main cause of breast cancer death. Mastectomy or lumpectomy followed by radiation therapy does not influence this risk [21]. The most common sites for breast cancer metastases are the skeleton, lung, liver, and brain [22]. In a Cochrane review by Rojas et al., which included 3055 women, there was no difference in overall or disease-free survival rates for patients who underwent intensive laboratory and imaging testing compared to those managed with clinical visits and mammography were seen [22]. Similar results were observed in two multicentric randomized surveillance studies performed in Italy in asymptomatic breast cancer patients. In both studies patients were randomized in two groups. One group had intensive follow-up, including bone scintigraphy, chest x-ray, and ultrasound of the liver, whereas the control group was examined only with imaging and laboratory test when clinical symptoms were present. In both studies intensive testing found more metastases; however, there was no significant difference seen in the overall survival between the two groups [23, 24]. As a consequence [3, 5, 6], several guidelines (Table 14.1) do not recommend intensive surveillance that would include routine blood tests, blood tests for tumor markers, chest x-ray, ultrasound of the liver, CT, MRI, or even PET/CT [5]. Nevertheless, surveillance programs vary among countries, organizations, and physicians. Physicians and patients favor intensive surveillance. In addition patients overestimate the role of laboratory and imaging tests and often incorrectly perceive the significance of a normal test [25, 26]. Keating et al. showed that patients who received care from oncologists had higher rates of testing than patients who were followed by their primary care physicians [25]. Grunfeld et al. [27] saw similar results were seen be in a retrospective study of 11,219 asymptomatic breast cancer survivors. Twenty-five percent of all patients had fewer than the recommended surveillance mammograms, and 50% had more than the recommended surveillance for metastatic disease (including bone scans, chest x-ray, CT, or MRI). Higher morbidity (more mastectomies) and seeing both an oncologist and primary care physicians increased the odds of having more intense imaging testing. Other studies found similar results, with the overuse of blood tests although rising tumor markers (i.e., CA 15-3 and CEA) suggest recurrence in asymptomatic patients [28]. Recently several studies demonstrated that in breast cancer patients with rising CA 15-3 and CEA levels the use of FDG-PET/CT would be of high diagnostic value, reporting an accuracy of up to 92% [29, 30]. Although FDG-PET/CT is not recommended for follow-up, suspected cases of recurrence that have equivocal conventional studies would be the best candidate for PET/CT [29]. In a recent study, Parmar et al. [5] assessed the role of imaging modalities in follow-up programs. Surprisingly, only 55% of patients showed strict adherence to the surveillance program. During the study period (2011–2007), the use of bone scans and mammograms decreased (21% to 13% and 81% to 75%, respectively), whereas use of MRI and FDG-PET/CT increased significantly (0.5% to 7% and 2% to 9%, respectively).
Overall, when imaging and laboratory tests are ordered in asymptomatic patients during follow-up surveillance, the cost-effectiveness and accuracy of applying supplemental testing must be considered. In addition efforts should be made to a more intensively educate of physicians to reduce to use of non-guideline conforming surveillance testing. Nevertheless, it has been evidentially seen that physicians and patients are not confident in the current surveillance programs with mammography as the only imaging modality considering the development of new and promising imaging technologies [29, 30]. Currently there is no evidence that early detection of metastases during follow-up improves survival. However, early detection may allow more accurate and curative intervention, and this may be the cause for the current trends, in which advanced imaging modalities other than mammography are used [5, 29].
Key Point
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Breast cancer patients who receive intensive screening and surveillance with imaging and laboratory studies have no survival benefit compared to those who undergo testing after clinical symptoms are evident.
14.3.3 Imaging for Bone, Lung, and Liver Metastases
Current guidelines (Table 14.1) recommend against the routine use of laboratory or imaging tests to detect asymptomatic metastases during staging or follow-up after breast cancer diagnosis. This paragraph describes briefly which imaging modalities should be used to detect distant metastases if clinical symptoms are present [6]. To detect skeletal metastases, bone scintigraphy is more effective than conventional radiography. Several recent studies suggest that FDG-PET/CT, PET/MRI, or whole-body MRI is significantly more accurate than bone scintigraphy, but both can still miss some metastases, particularly sclerotic ones. It is expected that these new imaging techniques will replace current technologies (Fig. 14.4). To detect lung metastases chest x-ray and CT are recommended. Chest x-ray is considered the most reasonable approach because of the low costs. In case of any questionable findings, CT is recommended as a baseline for monitoring and for follow-up. Liver metastases are not as common as lung or bone metastases; however, their appearance is associated with the worst prognosis. In symptomatic patients CT or MRI is recommended as more lesions can be diagnosed with a higher accuracy compared to US. Particularly for follow-up during therapy MRI should be advantageously used. Breast cancer is second only to lung carcinoma as a cause of brain metastases. Contrast-enhanced MRI has largely replaced CT for the detection and evaluation of brain lesions because of its high sensitivity (Fig. 14.5) [6].
14.3.4 Assessing Treatment Response of Distant Metastases
Once a breast cancer patient has been diagnosed with metastases, accurate assessment of treatment response is of the uppermost importance. Currently follow-up assessment is based on anatomic imaging (CT or MRI) (Fig. 14.6). Treatment response, particularly in clinical trials, is evaluated by the RECIST (Response Evaluation Criteria in Solid Tumors) 1.1 criteria. A change in the size of a given metastasis during treatment is a measure of response. In soft tissue metastases (e.g., liver, lung, and brain), this approach is currently acceptable. However, in bone metastases – the most common site of metastatic disease – this approach is problematic unless there is an extra-osseous soft tissue mass associated with the bone lesion. If FDG-PET/CT is used metabolic activity can be assessed and thus determine the response to treatment [7, 29, 30]. By comparing FDG-PET/CT with conventional anatomic CT, Vranjesevic et al. showed that the PPV (93% vs. 85%) and NPV (84% vs. 59%) of FDG-PET/CT were higher than with conventional imaging [7]. Other PET tracers (e.g., 18F-fluorothymidine) predict response at an early time point, and thus treatment change can be determined earlier which may lead to a better outcome with respect to disease burden and morbidity. Such approaches have been seen in lymphoma patients and should be implemented for breast cancer as well [7]. In addition PET/CT shows great promise in the assessment of patients who have various responses in different sites of metastases due to tumor heterogeneity. Several studies have reported discordant responses between bone and non-bone metastases in 30–43% [7]. Further FDG-PET/CT demonstrated response in patients who had no change at anatomic CT and predicted progression-free survival and disease-specific survival significantly better than CT [7].
14.4 Concluding Remarks
A well-defined evidence-based surveillance protocol is needed to manage patients with breast cancer after the initial diagnosis, as well as during staging and follow-up. The aims of any follow-up are to detect early local recurrence and to diagnose and treat cancer and/or therapy-related diseases such as metastases. Currently, mammography every 1–2 years is the only recommended evidence-based imaging modality. In asymptomatic patients, there are no data to indicate that any imaging or laboratory test leads to a survival benefit; thus these tests are not recommended during surveillance. Recent guidelines recommend CT or MRI in addition to bone scintigraphy for stage III and IV disease at the time of diagnosis. In the near future, it can be expected that sensitive imaging tests (whole-body MRI or PET/CT/MRI) will enhance the ability to stage breast cancer more accurately and will allow better prediction and assessment of treatment response during targeted therapy.
Take-Home Messages
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Regular, usually annual mammography is the cornerstone of surveillance of the ipsilateral breast in patients with a personal history of breast cancer who were treated with breast-conserving therapy.
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Local breast cancer recurrence may lack the typical imaging features of primary breast cancer, and reliable diagnosis is often based on the combination of a thorough clinical exam and tailored multimodality imaging.
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Current guidelines do not recommend intensive surveillance in asymptomatic breast cancer patients, which includes routine blood tests, chest x-ray, ultrasound of the liver, CT, MRI, or even PET/CT. At time of diagnosis, CT or MRI in addition to bone scintigraphy is recommended in stage III and IV disease.
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More sensitive imaging tests (e.g., whole-body MRI or PET/CT/MRI) will enhance the ability to stage breast cancer more accurately and may change current guidelines.
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Bick, U., Helbich, T.H. (2019). Follow-Up of Patients with Breast Cancer: Imaging of Local Recurrence and Distant Metastases. In: Hodler, J., Kubik-Huch, R., von Schulthess, G. (eds) Diseases of the Chest, Breast, Heart and Vessels 2019-2022. IDKD Springer Series. Springer, Cham. https://doi.org/10.1007/978-3-030-11149-6_14
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