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Review ArticleReviewsR

Sensitivity, Specificity and the Diagnostic Accuracy of PET/CT for Axillary Staging in Patients With Stage I-III Cancer: A Systematic Review of The Literature

JUDI KASEM, UMAR WAZIR and KEFAH MOKBEL
In Vivo January 2021, 35 (1) 23-30; DOI: https://doi.org/10.21873/invivo.12228
JUDI KASEM
1London Breast Institute, Princess Grace Hospital, London, U.K.;
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UMAR WAZIR
1London Breast Institute, Princess Grace Hospital, London, U.K.;
2Department of General Surgery, Khyber Teaching Hospital, Peshawar, Pakistan
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KEFAH MOKBEL
1London Breast Institute, Princess Grace Hospital, London, U.K.;
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  • For correspondence: kefah.mokbel@hotmail.com
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Abstract

Background/Aim: Axillary lymph node (ALN) status plays a key role in the staging of breast cancer. Positron Emission Tomography/Computed Tomography (PET/CT) using 18-Fluorodeoxyglucose (18FDG) can visualise ALN metastasis. However, its utility compared to current methods is unclear. We systematically reviewed the role of 18FDG PET/CT in breast cancer staging. Materials and Methods: PubMed, Ovid and Cochrane were searched systematically up until August 2020. Included papers had true positive (TP), false positive (FP), true negative (TN) and false negative (FN) rates, sensitivity, specificity, accuracy, positive (PPV) and negative predictive value (NPV). Results: Nine studies (n=1486) were included, showing: i) sensitivity=52.2%, ii) specificity=91.6%, iii) PPV=77.8%, iv) NPV=77.2, and v) accuracy=77.3%. Conclusion: 18FDG-PET/CT has a low sensitivity but high specificity for ALN disease. Therefore, ultrasound-guided biopsy could be considered in a positive CT/PET. Modest accuracy prohibits the use of 18FDG-PET/CT alone in axillary staging. Prospective research using standardised protocols and quantitative cut-off points is warranted.

  • Breast cancer
  • CT/PET
  • imaging
  • sentinel node biopsy
  • axillary disease

Axillary lymph node (ALN) assessment plays a key role in the staging and upstaging of breast cancer. It is an important predictor of the survival and disease recurrence in patients (1), thus determining prognosis and treatment (2). Axillary staging can also be used for therapeutic response monitoring (3). Current guidelines suggest sentinel lymph node biopsy (SNB) as the preferred technique for axillary staging, followed by axillary lymph node dissection (ALND) in patients with positive SNB results (4). SNB is not without surgical risk, and thus, a non-invasive alternative is highly desirable (3, 5).

Positron Emission Tomography (PET) using 18-Fluorodeoxyglucose (18FDG) highlights metabolically active locations in the body. When combined with Computed Tomography (CT) as 18FDG-PET/CT, this imaging modality could increase diagnostic accuracy significantly (6). A PET/CT scan could be assessed by one of two methods: one method being a qualitative, visual assessment and the other, by calculating the maximum standardized uptake value (SUVmax), which is a semi-quantitative method (7). When using visual assessment alone, experienced personnel provide a rating of suspected tumours, such as using a scale of “0 for normal, 1 for equivocal, 2 for probably abnormal and 3 for abnormal detecting subclinical nodal metastasis” (8) or simply deciding on whether uptake was higher than background activity (9).

SUVmax is calculated by dividing maximum activity in a region of interest (MBq/mL) by injected dose (MBq) divided by body weight (g) (10). SUVmax cut-off ranges across different studies from 0.8 to 3 (1, 2, 8). SUVmax can serve as an adjunct for reference when using visual assessment (1, 2, 11).

PET/CT is not only useful for the detection of locoregional lymph node involvement but also distant metastases (12). It has been suggested as potentially replacing other methods for detecting distant metastatic involvement (12), however when assessing axillary lymph node involvement, low sensitivity and high specificity have been reported (13). PET/CT has a reasonable overall accuracy with high specificity, hence it can be used for selecting patients for either SNB or ALND (10), thereby avoiding unnecessary procedures (14). In addition, most studies have only focused on a small number of tumour types, especially invasive ductal carcinoma (7), therefore more research is required to assemble the findings of the current literature on this topic.

Current literature is limited due to variations in study design, variety in breast cancer subtypes included, as well as methods of determining malignancy in scans (13). PET/CT is comparatively less sensitive in detecting ALN status when the primary tumour has a low uptake of 18FDG (7). Similar issues have been reported for small lesions (12) due to its restricted spatial resolution (3). False-negative (FN) results are associated with a higher T stage (15). An increased likelihood of FNs can be influenced by i) increased age, ii) positive oestrogen receptor status and iii) mixed tissue histology, whereas being HER-2 positive can decrease the likelihood (16).

There is currently no consensus on the role of PET/CT in guiding therapy. Whilst a preponderance of authors do not believe it to be a substitute for SNB or ALND (2) with no role in the management of early breast cancer patients (17), some believe that it could determine whether SNB or ALND is required (10, 14) and potentially screen out patients with non-suspicious nodes (18).

We aim to systematically review the literature regarding the diagnostic performance of 18FDG PET/CT in the assessment of lymphatic metastasis in stage I-III breast cancer, and discuss the potential role this modality could have in the management of breast cancer.

Materials and Methods

Data search. PubMed, Ovid and Cochrane library databases were searched to identify any relevant publications. The PubMed search was conducted on 29th July 2020. The Ovid database was searched on the 29th July 2020. This search included the Embase, Emcare and Ovid MEDLIE(R) and Epub Ahead of Print, In-Process & Other Non-Indexed Citations, Daily and Versions (R). The search terms used were as follows: “PET OR positron emission tomography” AND “CT or computerized tomography OR computerised tomography” AND “axillary” AND “staging”.

The Cochrane library search was conducted on 15th August 2020 using the terms “PET/CT” and “axilla” including any associated terms.

Inclusion & exclusion criteria. Both prospective and retrospective studies were included. Papers were included if they assessed the sensitivity, specificity and diagnostic accuracy of PET/CT for axillary lymph node metastases. Only studies with full text articles published in English were included. In addition, studies were included if they focused on either visual assessment or using SUVmax of PET/CT scans. Finally, the participant cohort had to be limited to patients with Stage I-III cancer.

Studies were excluded if they did not specify their standard of reference or method of evaluation of PET/CT scans. Papers were also excluded if they did not compare PET/CT to histopathological findings. Studies with sample sizes of below 50 were excluded. Papers were excluded if true positive (TP), false positive (FP), true negative (TN) or false negative (FN) rates could not be extracted to form a 2 by 2 contingency table. Papers were excluded where participants had a PET/CT after or during neo-adjunctive therapy. Other exclusion criteria involved Stage IV breast cancer patients. Data extraction and management. Papers were reviewed and information including authors, publication date, time, location and study type, was collected. Participants’ average age was extracted, along with breast cancer subtype. Standard of reference and information on 18FDG dose were also included. All papers had true positive (TP), false positive (FP), true negative (TN) and false negative (FN) rates excerpted, along with sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) and diagnostic accuracy. This extracted data were combined to calculate overall pooled means for sensitivity, specificity, PPV, NPV and accuracy for papers using visual assessment. Pooled values were calculated by combining the overall results for TP, FP, TN, and FN from each respective study.

A pooled analysis could not be carried out for the SUVmax method as studies used different SUVmax cut offs.

Quality analysis. The quality of the studies included in this review was assessed using Section A and B of the CASP critical appraisal tool for diagnostic studies.

Results

Overall, 1,106 articles (PubMed: 255, Ovid: 830, Cochrane: 21) were identified and two further articles were found through assessing article bibliographies. Following removal of duplicates 892 remained. After screening of abstracts, 117 full text articles were assessed, 37 full texts were not available, shorting the assessment to 80 articles. Studies were excluded due to not focussing on either axillary lymph node metastases (n=5) or evaluation of diagnostic accuracy (n=24). One article was excluded for using a different tracer (not 18FDG). Other excluded studies did not have primary data and were general reviews of the use of PET/CT in axillary staging (n=9).

Finally, ten studies were selected for this systematic review (Figure 1) (Table I). Eight studies (2, 7, 9, 16, 19-22) were retrospective and two were prospective (1, 8). Seven papers used both visual assessment as well as SUVmax (1, 7-9, 16, 20, 22), whereas one used SUVmax as a concomitant only indicator (21, 23). Two studies used only SUVmax (2) or visual (19) assessment, while all studies used histopathology assessment as the standard of reference. Most studies included patients with ductal or lobular carcinomas (1, 2, 9, 19, 20), and one study did not define what other cancer subtypes were included (8). Another paper did not specify what breast cancer subtype was included (22). Doses of 18FDG differed across the papers but the most common one was 3.7 Mbq/kg (1, 7, 9). Overall, 1,484 patients underwent PET/CT with visual assessment being the main criterion for ALN assessment, whereas 373 underwent SUVmax as the main criterion.

Figure 1.
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Figure 1.

A PRISMA flowchart of data collected and selected studies.

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Table I.

A summary table of papers included in this review.

Quality assessment. The critical analysis of the studies is outlined in Table II. Some studies only included tumour and node staging rather than overall staging (8, 9, 16, 19, 21, 22). These were concluded to be Stage I-III as no mention of peripheral metastasis occurred.

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Table II.

A CASP critical analysis of the papers included in this review.

Diagnostic accuracy. Most papers only reported diagnostic accuracy for visual assessment (8, 9, 16, 19-21, 24) (Table III), whereas only three papers offered diagnostic accuracy on the SUVmax method (1, 2, 22). The sensitivity for visual analysis ranged from 18.5-85% (9, 22), whereas specificity ranged from 77.9-97.1% (9, 16). Overall specificity was high, with seven studies finding it above 90% (7-9, 12, 19, 21, 22). PPV was generally above 70% (1, 8, 16, 19, 22), however, Jeong et al. (20) have found it to be 37%. Overall accuracy was above 70%, with the exception of Jeong et al., who reported an accuracy of 69.1% (20).

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Table III.

A summary of diagnostic accuracy 18FDG-PET/CT scans for ALN metastasis when using visual, qualitative assessment. Where values or 95% confidence intervals were not provided the authors calculated these.

Regarding SUVmax (Table IV), when the cut off was set at 1.1 for Mori et al. (21), overall accuracy was 94% whereas Ueda et al. (1) have found that even when SUVmax was set at different cut off points, overall best accuracy was at a cut off of 0.8, with a diagnostic accuracy of 80.9%.

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Table IV.

A summary of diagnostic accuracy 18FDG-PET/CT scans for ALN metastasis when using SUVmax assessment. Where values or 95% confidence intervals were not provided the authors calculated these.

When assessing for the pooled analysis for papers using visual qualitive assessment as the PET/CT criteria, 1,486 axillae were included in the analysis. PET/CT correctly identified malignancy in 281 axillae, however, it missed malignancy in 257 of them. Hence, pooled sensitivity was 52.2%. Pooled specificity was 91.6%, as PET/CT correctly declared 868 axillae as clear of lymph node metastasis. Overall, pooled diagnostic accuracy was 77.3%.

Discussion

This study systematically reviewed the diagnostic performance of 18FDG PET/CT in the assessment of ALN metastasis in patients with stage I-III breast cancer. Overall, across the papers included in this review, many studies found similar findings for sensitivity and specificity. PET/CT was shown to have high specificity but low sensitivity, leading to a moderate overall accuracy (10).

Our calculated pooled sensitivity of 52% is similar to that reported in a meta-analysis performed by Zhang et al. [56%; 95% confidence interval (CI)=47%-63%] (13). The sensitivity in our pooled analysis ranged from 18.5% to 85% (9, 22). The likelihood of FNs can be influenced by old age, primary tumour characteristics and volume of axillary disease (16).

Mori et al. (22) did not state the tissue histology of the cancer included in their study, which could have affected their sensitivity. However, they did also use Time-Of-Flight 18FDG PET/CT, which performs better than normal PET/CT (25).

Jeong et al. (20) have found sensitivity to be 20.8%, however, the study participants had tumours that were in their early stage and micrometastatic nodes. As PET/CT has a small spatial resolution, small ALN metastasis can be left undetected (3, 16, 20, 26-29) leading to an increased false-negative rate and a decreased sensitivity. This especially occurs for micrometastases as observed by Kutlutürk et al. (16), who have found that these accounted for 32% of FNs, as 18FDG uptake depends on the nature of the tumour (9). A review of the recent literature suggests that such deposits may not warrant ALND, and could be treated using adjuvant chemotherapy and endocrine therapy (30).

We have observed a relatively high specificity of 91.6% with a range from 77.9% to 97.1% (9, 16). This finding is consistent with the prior meta-analysis by Zhang et al. (13), who have reported an overall specificity of 91% (95%CI: 87%-93%) for visual analysis. Wahl et al. (28) have found in a prospective multicentre study that FN findings occur in patients with reduced tumour burdens (28). Due to its relatively high specificity, PET/CT could be used to avoid SNB and ALND in those with a negative result (28). A positive axilla on PET/CT is considered a good indication of ALN involvement (31), due to the relatively high specificity.

Most studies in this review have only reported diagnostic performance when using only qualitative visual analysis of PET/CT scans of the axilla (7-9, 16, 19-21). Kitajima et al. (3) have found that diagnostic performance was not significantly different between visual assessment and SUVmax analysis. When applying 18FDG PET/CT for the use of ALN staging, both visual and semi-qualitative analysis should be used (16).

Zhang et al. (13) have also found that when SUVmax is used separately, pooled sensitivity can increase slightly and specificity decreases significantly (p<0.05) (13), however, similar to this review only a small number of papers could be included in their analysis. Higher ALN SUVmax can decrease false positive rates (16) as seen in a study by Ueda et al.’s (1), whereas SUVmax cut off points increase past 1.8, with specificity at 100% but sensitivity decreased to 36%. Kim et al. (29) have suggested that lowering the SUVmax threshold to less than 1.05 can lead to sensitivity being 100%, hence omitting all FNs. Potentially, false positive rates could be reduced by using SUVmax analysis (28). Visual analysis has been shown to be accurate and suggested as being easier to implement in practise (24).

Generally, it has been found that 18FDG PET/CT has a moderate sensitivity and a high specificity for ALN metastasis (10), and we found pooled diagnostic accuracy to be 77.3%. The current literature, including studies in this review, is equivocal regarding the utility of 18FDG PET/CT. 18FDG PET/CT could be used to determine whether patients require SNB or ALND (10, 18), thereby avoiding a potentially unnecessary invasive procedure (10, 14). Some authors suggest that when 18FDG PET/CT is positive patients could be offered ALND immediately (8, 28, 32), whereas a negative finding on 18FDG PET/CT indicates the continued need of SNB. This is due to the high FN rate observed (8). The FNR of 48% for PET/CT (sensitivity=52%) compares with 10% for SNB (33). Therefore, we could not rely on a negative PET scan to avoid axillary surgery.

In contrast, other authors do not believe PET/CT should be routinely used (17) and could not replace current approaches for axillary staging (19), especially in view of its poor lesion-by-lesion-based sensitivity (19). Most studies we analysed did not directly compare PET/CT scan results with histological findings in a node-to-node manner, thereby limiting the conclusions that could have been drawn (13).

Some authors have suggested that PET/CT scans of the axilla could assist in therapeutic decision-making by revising the disease stage (34).

The limitations of this study are that it included mostly retrospective papers, hence a selection bias might have occurred when selecting patients. In addition, as most papers did not include a lesion-by-lesion analysis, it is more difficult to ascertain the true diagnostic accuracy of this staging method. Lastly, we did not perform a heterogeneity test; however, we did assess the quality of the papers included through the use of a critical analysis tool.

Further research is required to find a consensus on the use of 18FDG PET/CT scans in axillary staging. Specifically, there is a need for prospective studies assessing whether it could help in deciding whether a patient should have an SNB or proceed directly to ALND, thus, avoiding unnecessary invasive procedures.

In addition, further research is necessary to ascertain whether the qualitive visual method is comparable to the semi-qualitative method using SUVmax. Furthermore, clinically useful SUVmax thresholds need to be delineated. Finally, it needs to be clarified whether primary tumour size is a determinant of the efficacy of 18FDG-PET/CT in axillary staging.

In conclusion, it was observed that overall 18FDG-PET/CT offers low sensitivity but high specificity for axillary lymph node metastatic disease. Visual analysis proved to be a fair method when assessing PET/CT scans, however, it cannot be used as the sole method to evaluate the ALN status nor can it replace the current staging procedures. 18FDG-PET/CT could potentially be used to direct whether a patient requires SNB prior to ALND, however, additional prospective research should be conducted before guidelines for a conclusive recommendation could be made.

Acknowledgements

This work was made possible by support from the Breast Cancer Hope Foundation, UK.

Footnotes

  • Authors’ Contributions

    KM supervised and initialised the project. JK drafted the initial manuscript. UW performed the literature search and produced the final draft of the manuscript.

  • This article is freely accessible online.

  • Conflicts of Interest

    The Authors do not have any conflicts of interest to declare in relation to this article.

  • Received October 13, 2020.
  • Revision received November 4, 2020.
  • Accepted November 6, 2020.
  • Copyright© 2021, International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved

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In Vivo: 35 (1)
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Vol. 35, Issue 1
January-February 2021
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Sensitivity, Specificity and the Diagnostic Accuracy of PET/CT for Axillary Staging in Patients With Stage I-III Cancer: A Systematic Review of The Literature
JUDI KASEM, UMAR WAZIR, KEFAH MOKBEL
In Vivo Jan 2021, 35 (1) 23-30; DOI: 10.21873/invivo.12228

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Sensitivity, Specificity and the Diagnostic Accuracy of PET/CT for Axillary Staging in Patients With Stage I-III Cancer: A Systematic Review of The Literature
JUDI KASEM, UMAR WAZIR, KEFAH MOKBEL
In Vivo Jan 2021, 35 (1) 23-30; DOI: 10.21873/invivo.12228
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