TABLE 2.

Frequency of Each PET/CT Indication in Different Cancer Types

Indication no.	Clinical indication	BC	NHL	HD	CRC	Melanoma	Lung cancer
18F-FDG PET/CT for diagnosis of tumor recurrence
1	Prior clinical suspicion of tumor recurrence	15	19	6	4	7	5
2	Prior rising tumor markers or abnormal laboratory tests suggesting tumor recurrence	14	1	0	8	0	2
3	Prior suggestive imaging (CT or MRI) for tumor recurrence	23	6	6	23	7	26
4	Prior indeterminate or suggestive PET/CT scan for tumor recurrence	17	21	8	25	19	41
18F-FDG PET/CT before starting therapy for tumor recurrence
5	Restaging after confirmation of tumor recurrence	5	0	2	2	7	2
6	If the extent of disease will alter therapy or if a new baseline was needed before change in therapy	13	6	4	12	3	8
18F-FDG PET/CT to assess therapy response for tumor recurrence
7	Therapy response assessment of recurrence	38	30	35	70	40	53
8	Intratreatment assessment of recurrence	38	3	39	36	47	47
9	Follow-up scan to assess the previous equivocal response	10	1	1	6	7	6
Follow-up 18F-FDG PET/CT after completion of treatment for tumor recurrence
10	Follow-up for stable disease	96	17	3	4	1	11
11	Follow-up for disease progression	62	7	3	21	12	17
12	Follow-up of disease in remission or per clinical trial protocol	95	97	75	75	121	68
Total		426	208	182	286	271	286

BC = breast cancer; NHL = non-Hodgkin lymphoma; HD = Hodgkin disease; CRC = colorectal cancer.