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Table 2 Results of PET/CT imaging (patient-based) and impact on patient’s management

From: 18F-FDG and 68Ga-somatostatin analogs PET/CT in patients with Merkel cell carcinoma: a comparison study

Patient

Pre-PET/CT morphological imaging

18F-FDG PET/CT

68Ga-SRI PET/CT

Change in management

Patient management

Follow-up (months)

Outcome

Type

Result (findings)

Results (findings)

Results (findings)

Expected

Undertaken

1

CT

Positive (residual primary MCC, Lns)

TP (residual primary MCC, Lns, liver)

TP (primary MCC, Lns)

Yes

Local RT

CHT

9

Dead in PD

2a

CT

Positive (Lns)

TP (Lns)

TP (Lns)

No

CHT

CHT

8

Dead in PD

3

CT

Positive/suspicious (lung)

TN

TN

Yes

Individualized treatment

Wait and see

67

Alive, NED

4

CT

Positive (1 residual Ln)

TP (1 Ln)

TP (1 Ln)

No

Surgery + RT (lymph node)

Surgery + RT (lymph node)

34

Dead in PD

5

US

Negative

TN

TN

No

Adjuvant RT (loco-regional lymph nodes)

Adjuvant RT (loco-regional lymph nodes)

54

Alive, NED

6

CT

Positive/suspicious (Lns, liver)

TN

TN

Yes

CHT

Adjuvant RT (loco-regional lymph nodes)

52

Alive, NED

7

CT, MRI

Positive (residual primary MCC)

TP (residual primary MCC)

TP (primary MCC)

No

CHT

CHT

43

Alive, NED

8

CT

Positive (Lns)

TP (Lns)

TP (Lns)

Yes

CHT

SS analogs treatment

8

Dead in PD

9

CT

Negative

FP# (skin)

FP# (skin)

No

Adjuvant RT (primary site + loco-regional lymph nodes)

Adjuvant RT (primary site + loco-regional lymph nodes)

27

Alive, NED

10*

US

Negative

TN

FP§ (liver)

No

Wait and see

Wait and see

66

Dead (MCC-unrelated)

11*

US

Positive/suspicious (Lns)

TP (Lns, skin)

TP (Lns, skin)

No

CHT

CHT

21

Dead in PD

12

CT, US

Negative

TN

TN

No

Wait and see

Wait and see

122

Alive, NED

13

CT, US

Negative

TN

TN

No

Wait and see

Wait and see

118

Alive, NED

14*

US

Positive (Lns)

TP (Lns, thoracic wall, adrenals)

TP (Lns, thoracic wall, adrenals)

No

CHT

CHT

7

Dead in PD

15*

CT

Positive (Lns)

TP (Lns)

TP (Lns)

No

CHT

CHT

9

Dead in PD

  1. PET/CT positron emission tomography/computed tomography, 18F-FDG 18F-fluoro-deoxy-glucose, 68Ga-SRI 68Ga-somatostatin receptor imaging, CT computed tomography, MRI magnetic resonance imaging, US ultrasonography, MCC Merkel cell carcinoma, Lns multiple lymph nodes, Ln lymph node, TP true positive, TN true negative, FP false positive, RT radiotherapy, CHT chemotherapy, SS somatostatin, PD progression disease, NED no evidence of disease
  2. *Patient with recurrent/relapsed MCC
  3. #Radiotracer uptake at the site of primary MCC removal, then attributed to cutaneous post-surgical inflammation
  4. §Focus of liver activity not confirmed at following imaging