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16 18F-FES
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16.4 Clinical Indications
16.4.1 Predictive andPrognostic Biomarker
[18F]-FES has been demonstrated to distinguish tumors with intrinsically good or poor prognosis, alone [35, 36] or in combination with [18F]-FDG [37–39], and to determine which therapies could be effective in which patients [35, 37, 38, 40–55]. Measurements of SUVmax of [18F]-FES PET/CT serial images could be used to predict the patient progression-free survival (PFS) receiving ER antagonist therapy, such as fulvestrant [35, 46]. While the combination of [18F]-FES and [18F]-FDG is shown to be particularly useful in identifying ER heterogeneity in BC bone metas­tases, which signicantly associated with sur­vival. Moreover, the extension of the FDG-avid component correlates with the risk of disease progression [39]. The most important clinical impact is the ability of [18F]-FES to predict patients who can be treated successfully by hor­monal therapies. Despite ER+ breast cancer on IHC, most of the patients respond to rst-line hormonal therapies, and less than half respond to second- or third-line hormonal therapies [41]. Only a functional ER able to bind estrogen ligand, visualizable using [18F]-FES as PET radiotracer, is a good predictive biomarker [43]. Several studies have demonstrated the predictiv­ity of this radiotracer for selecting patients that will benet from different kinds of therapies, such as unspecic hormonal and chemotherapy [
43] or tamoxifen and hormonal therapies fol-
lowing progression on tamoxifen [44, 45]. Also, in the case of novel hormonal therapies, such as SERDs (fulvestrant), which degrade ER and thus block estrogen binding to ER, aromatase inhibi­tors (AI), which block estrogen production, and cyclin-dependent kinase (CDK) 4/6 inhibitors, which block downstream ER effects, [18F]-FES seems to be a good predictive biomarker. The results of Fig.16.6 show how only a three-way PET classier ([18F]-FES heterogeneous, Fig. 16.6a, low [18F]-(FES/FDG) and high [18F]-(FES/FDG) groups, Fig. 16.6b) remained the only independent, statistically signicant
prognostic factor for PFS (Fig. with ER-positive metastatic breast cancer under fulvestrant therapy [56].
16.6c) in patients
16.4.2 ER Assessment
In France, the [18F]-FES is approved for the whole-body evaluation of recurrent ER-positive breast cancer in place of biopsy [17]. While the FDA strongly encourages bioptic conrmation of [18F]-FES PET ndings, in line with prevailing practices that biopsy is the best practice for treat­ment whenever possible (5). However, in the case of the brain or deep osseous spinal lesions where the biopsy is difcult, impossible, or only possi­ble with substantial risks, the use of [18F]-FES to assess a functional ER is very useful. Bonapati [57] et al. reported how in two representative cases the use of [18F]-FES PET/CT improves the detection of intraorbital metastases in ER-positive BC (Fig.16.7a, b). Abnormal intense [18F]-FES activity in the right posterior orbit (A, arrow) and normal physiologic 18F-FDG activity in the right extraocular muscles (B, arrow). Adopted from [57].
16.4.3 Problem-Solving Clinical Dilemmas
In a recent retrospective study, Boers [58] etal. investigated the value of [ management of clinical dilemmas in BC patients, not solvable with standard workup. They ana­lyzed 100 scans performed on 83 patients in Groningen between 2009 and 2019. The clinical dilemma, as described in Table16.1, was solved in 87 of 100 scans (87%). Most of the frequency of solved dilemmas was related to whether scans were 18F-FES–positive (n=63) or [18F]-FES neg­ative (n=37; P<0.001) rather than to itself clini- cal dilemma category (P=0.334) [58].
Similar results were reported [59–61] using [18F]-FES to solve a clinical dilemma in the case of inconclusive results from other diagnostic studies. Even if van Kruchten etal. found FES PET solved clinical problems and led to therapy
18
F]-FES PET in the
278
a
b
Months
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F-FDG
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M. R. Ruggiero et al.
P < 0.001
Heterogeneous group (n = 12)Low FES/FDG (n = 11)
High FES/FDG (n = 12)
F]-FES/FDG SUVmax (0.96); (c) Kaplan–
18
F]-FES positive metastatic lesions were divided
18
010203040
1. 0
0.8
0.6
0.4
0.2
0.0
c
progression-free survival (proportion)
Meier curves of PFS stratied by the three classications groups. (Adopted and modi-
ed from [56])
group. Patients with 100% of the [
into two groups by the median ratio of [
F-FDG
18
Heterogeneous group
F]-(FES/FDG)
18
F-FES
18
F-FES
18
F-FDG
18
F]-FES.His PFS was 3.7months with any clinical
18
F]-FES positive and negative lesions. The left rib shows signicant
18
F]-FDG but not on [
18
F-FES
18
Low FES/FDG High FES/FDG
uptake on [
Fig. 16.6 (a) Representative cases of a heterogeneous group. A 50-year-old female
patient has both [
benet from fulvestrant treatment; (b) representative cases of the [
ab
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Fig. 16.7 Abnormal intense [18F]-FES activity in the right posterior orbit (a, arrow) and normal physiologic [18F]-FDG activity in the right extraocular muscles (b, arrow). (Adopted from [57])
279
Table 16.1
performed on BC patients [
The clinical dilemma category was modied from the original paper [58]
Inability to determine the extent of metastatic disease or suspected metastatic disease with the standard workup
Unclear ER status of the tumor 31 Inability to determine which primary
tumor caused the metastases
The clinical dilemma category in 100 scans
58]
Number of cases
52
17
comparison of the performance of both radiotracers [18F]-FES PET and [18F]-FDG PET.Figure16.8 is an example of this compari­son [62]. Some studies demonstrated not only comparable sensitivities [62–64] but also the change in clinical management in 26% of patients [64]. A retrospective analysis of six prospective trials where [18F]-FES and [18F]-FDG PET were performed in close relation identied patients with invasive lobular breast cancer (ILC) as a
changes in 48% of patients, the detection of liver metastases by [18F]-FES PET was poor conrm-
subset of ER-positive breast cancer where FES PET compared favorably to FDG PET [
ing the biggest issue of the use of FES in clinical practice [59].
16.4.5 Correlation ER-Targeted
18
Therapeutics and[
F]-FES
16.4.4 Systemic Staging
In the era of improving personalized medicine the
There are ongoing prospective clinical trials of [18F]-FES PET for the staging of ER-positive breast cancer in Europe (Clinicaltrialsregister. EU) and the USA (ClinicalTrials.gov). Current standard-of-care imaging for systemic staging of breast cancer is CT/bone scan and the FDG PET/ CT.So, the aim of most ongoing projects is the
use of [18F]-FES PET not only to assess ER block­ade in patients on ER antagonists, especially in patients who fail to respond, but also in the early stages of drug development is increasing and many groups reported the success of this paradigm.
In 2011, Linden etal. evaluated estrogen binding changes in patients with metastatic ER-positive BC
65].
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a b
c
d
e
Fig. 16.8 [18F]-FDG and [18F]-FES PET/CT images of a 46-year-old female with lobular carcinoma and histologi­cally conrmed ER-positive recurrence in the left axillary level II lymph node (Allred score=8). Maximum inten­sity projection (a) and transaxial [ show equivocal uptake in the left axillary lymph node
18
F]-FDG images (b–e)
after different kinds of endocrine therapy [48], such as the receptor blocking agents (tamoxifen and ful­vestrant) and aromatase inhibitors. The [18F]-FES SUV (dened as [18F]-FES SUV≤1.5) allowed to discriminate between complete and uncomplete tumor ER blockade [48]. Indeed, Van Kruchten et al. determined the fulvestrant dose needed to abolish ER binding of estrogen ligands using [18F]-FES [46]. In a multicenter phase I trial, the biologic effective dose (BED) of a novel ER-targeted was determined using [18F]-FES [66]. They hypoth­esized that the coupling of optimal dose and maxi­mum
pharmacologic effect could best assess ER blockade through baseline and post-therapy imag­ing. In early-phase, clinical trials of novel ER-targeting therapeutics, the use of [18F]-FES PET has now become common to successfully deter­mine the BED for multiple agents [67–69].
f
g
h
i
j
(arrows) and physiologic bone uptake in the thoracic spine (dotted arrows). However, positive [ seen in the axillary lymph nodes (f–h; arrows) and the rst thoracic vertebra (f, i, j; dotted arrows). (Adopted from
62])
[
18
F]-FES uptake is
cers, such as uterine cancers. It is well known that
18
the uptake of [
F]-FES and [18F]-FDG is espe­cially useful for the differential diagnosis of endo­metrial hyperplasia in low-grade and high- grade endometrial cancer. In particular, the characteris­tics of low-grade endometrial carcinomas are decreased uptake of [18F]-FES, increased uptake of [18F]-FDG, with an increased ratio of [18F]-FDG to [18F]-FES uptake [70, 71]. On the opposite high-grade carcinomas show an increased [18F]-FDG to [18F]-FES uptake ratio. In the same manner, malignant uterine sarcomas demonstrate
18
lower [
F]-FES uptake and a higher [18F]-FDG to [18F]-FES uptake ratio allowing differentiation between benign uterine leiomyomas and malig­nant uterine sarcomas [72, 73]. Additionally, other studies show the use of [18F]-FES to imaging the majority of ovarian cancers that express ER [74–76].
16.4.6 Utilization of18F-FES inOther Populations
As analogous to estradiol, [18F]-FES PET can use as a PET radiotracer for other ER-expressing can-
16.5 Clinical Cases
Case 1 [77] (Fig.16.9)
Case 2 [78] (Fig.16.10)
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Fig. 16.9 A 73-year-old female underwent lymphatic node ultrasonography, and core-needle biopsy showed carcinoma invasive NST G1 (Ki67 1%), ER (3+) 100%, and HER-2 negative in both breasts. PET/CT with 18F­FES showed pathological uptakes in both breast tumors, but lymph node packages in the left axilla and enlarged cervical nodes were not estrogen-positive metastasis from breast cancer. Therefore, a core-needle biopsy of the left
axilla lymph node was done with the result of DLBCL Ki67 90%. For DLBCL staging, PET/CT with [
18
F]-FDG was performed. The pathological uptakes were present in the left axilla tumor and enlarged cervical nodes. In this case, PET/CT with [
18
F]-FDG and [18F]-FES performed along with FNA or core-needle biopsy allows for estab­lishing the right diagnosis and the stage of both diseases. Case 1 [77]
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Fig. 16.10 A 64-year-old female with multiple metasta­ses from breast cancer showed the same degree of accu­mulation of [ lymphadenopathy, whereas higher 18F-FES uptake than
18
[
F]-FDG uptake was detected in right supraclavicular lymphadenopathy. In patients with multiple metastases from breast cancer, the combination of [
18
[
F]-FDG-PET imaging studies has the potential to reect
18
F]-FDG as [18F]-FES in left hilar
16.6 PET/CT Acquisition Protocol
Prior recommendations for [18F]-FES use can be found in Venema etal. [79] and Kurland et al. [80]. Thus prescribing information is available from the FDA label [18]. Before administering [18F]-FES, it is important to conrm the patient is
18
F]-FES and
tumor heterogeneity and characterize the in vivo tumor phenotype. The index of the [ ratio could be used as a determinant of hormonal therapies such as tamoxifen and aromatase inhibitor for breast can­cer and pregestational agents and gonadotropin-releasing hormone agonists for gynecological tumors. Case 2 [78]
18
F]-FDG: [18F]-FES SUV
not pregnant and not using selective estrogenic receptor modulators, such as tamoxifen, or selec­tive estrogenic degraders (SERDs), such as ful­vestrant. Current guidelines suggest withdrawal from tamoxifen for 8weeks and withdrawal from fulvestrant for 28 weeks. The recommended administered dose is 111–222MBq of FES (often
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185 MBq), administered over 1–2 min. PET imaging is to begin 20–80 min (often 60min) after radiopharmaceutical administration.
16.7 Variants andPitfalls
In the clinical practice, the main limitation of the use of [18F]-FES is hard detection of liver metas­tases due to high hepatic uptake. Rapid blood clearance, leading to lower tumoral uptake, and low selectivity for ERα and ERβ, resulting in reduced specicity of the procedure, are other undeniable pitfalls of this radiotracer. For this reason, additional estradiol analogs have been developed. Most relevant for the clinical practice may be radiopharmaceuticals such as 4-uoro­11β -methoxy-16α -[18F]-fluoroestradiol (4FM-[18F]F-FES) [81] and 1-(2-(2-(2-[18F]uo­roethoxy)ethoxy)ethyl)-1H-1,2,3-triazole­estradiol ([18F]F-FETE) [82] to improve target selectivity. As detector of functional ER, [18F]-FES could not detect unfunctional ER, still expressed in tumors. Thus, the lower sensitivity for predicting the response to endocrine therapy in breast cancer patients is strongly correlated with [18F]-FES uptake and the degree of stromal components [40]. Therapy like selective estrogen receptor modulators or degraders (e.g., SERMs or SERDs) must be discontinued before the PET imaging to avoid interference with [18F]-FES uptake [18].
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