Introduction
Materials and Methods
Patient Population
[18F]FDG PET/CT Imaging
[18F]FDG PET/CT Analysis
Histopathology
Mutational Analysis
Survival Outcomes
Statistical Methods
Results
Characteristics | Total | PIK3CA wild-type | PIK3CA mutation | p value |
---|---|---|---|---|
n = 67 | n = 37 | n = 30 | ||
Age (years) | ||||
Median | 64 | 63 | 66 | 0.49 |
Tumor size (longest diameter in contrast-enhanced MRI) | ||||
Median (mm) | 22 (11–90) | 25 (11–90) | 17.5 (12–75) | 0.06 < 0.01 |
T1c (11–20 mm) | 30 (44.8 %) | 10 (27 %) | 19 (63.3 %) | |
T2 (21–50 mm) | 31 (46.3 %) | 22 (59.5) | 10 (33.3 %) | |
T3 (> 50 mm) | 6 (9 %) | 5 (13.5 %) | 1 (3.3 %) | |
Tumor grade* | ||||
Grade 1 | 9 (13.4 %) | 3 (8.1 %) | 6 (20 %) | 0.07 (0.04**) |
Grade 2 | 30 (44.8 %) | 13 (35.1 %) | 17 (56.7 %) | |
Grade 3 | 24 (35.8 %) | 17 (46 %) | 7 (23.3 %) | |
Grade n/a | 4 (6 %) | 4 (10.8 %) | 0 (0 %) | |
Estrogen receptor | ||||
Low (10–20 %) | 1 (1.5 %) | 1 (2.7 %) | 0 (0 %) | 1 |
Medium (30–70 %) | 4 (6 %) | 2 (5.4 %) | 2 (6.7 %) | |
High (80–100 %) | 62 (92.5 %) | 34 (91.9 %) | 28 (93.3 %) | |
Progesterone receptor | ||||
Negative (< 10 %) | 13 (19.4 %) | 8 (21.6 %) | 5 (16.7 %) | 0.89 |
Low (10–20 %) | 7 (10.5 %) | 4 (10.8 %) | 3 (10 %) | |
Medium (30–70 %) | 21 (31.3 %) | 10 (27 %) | 11 (36.7 %) | |
High (80–100 %) | 26 (38.8) | 15 (40.5 %) | 11 (36.7 %) | |
Ki67 (%) | ||||
< 20 % | 23 (34.3 %) | 11 (29.7 %) | 12 (40 %) | 0.6 |
≥ 20 % | 42 (62.7 %) | 24 (64.9 %) | 18 (60 %) | |
Not applicable | 2 (3 %) | 2 (5.4 %) | 0 (0 %) | |
Nodal status | ||||
Negative | 42 (62.7 %) | 20 (54.1 %) | 22 (73.3 %) | 0.27 |
1–3 positive nodes | 10 (14.9 %) | 4 (10.8 %) | 6 (20 %) | |
4–10 positive nodes | 9 (13.4 %) | 8 (21.6 %) | 1 (3.3 %) | |
> 10 positive nodes | 3 (4.5 %) | 3 (8.1 %) | 0 (0 %) | |
Not applicable | 3 (4.5 %) | 2 (5.4 %) | 1 (3.3 %) | |
Menopausal status | ||||
Premenopausal | 14 (20.9 %) | 10 (27 %) | 4 (13.3 %) | 0.18 |
Postmenopausal | 52 (77.6 %) | 27 (73 %) | 25 (83.3 %) | |
Not applicable | 1 (1.5 %) | 0 (0 %) | 1 (3.3 %) | |
Median follow-up (months) | ||||
Recurrence-free survival | 62 | 63 | 62 | 0.5 |
Disease-specific survival | 64 | 68 | 62 | 0.22 |
Mutational Analysis
PIK3CA Mutational Status, Clinico-Pathologic Factors, and Glycolytic Activity
Association of PIK3CA Mutational Status and Clinico-Pathologic Factors
Association of Glycolytic Activity and Clinico-Pathologic Factors
Histopathology | Number | Median SUVmax (interquartile range) | p value | |
---|---|---|---|---|
Invasive ductal carcinoma grade 1 | 9 | 2.56 |
0.01
|
0.02
|
(2.25–3.69) | ||||
Invasive ductal carcinoma grade 2 | 19 | 3.69 | ||
(2.58–5.74) | ||||
Invasive ductal carcinoma grade 3 | 24 | 5.82 | ||
(3.25–8.42) | ||||
Invasive lobular carcinoma grade 2 | 11 | 2.21 | ||
(1.93–3.74) |
Association of PIK3CA Mutational Status and Glycolytic Activity
PIK3CA
| Number | Median SUVmax (interquartile range) | p value |
---|---|---|---|
Wild-type | 37 | 3.19 | 0.07 |
(2.27–5.1) | |||
Mutation | 30 | 5.09 | |
(2.68–7.16) | |||
Exon 20 mutation | 15 | 5.62 | 0.42 |
(2.87–6.82) | |||
Exon 9 mutation | 10 | 5.09 | |
(2.76–6.9) | |||
Exon 7 mutation | 1 | 1.62 | |
(NA) | |||
Exon 4 mutation | 4 | 5.35 | |
(2.52–8.42) |