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2018 ; 9
(33
): 22976-22985
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Carbon ion radiotherapy for inoperable pediatric osteosarcoma
#MMPMID29796166
Mohamad O
; Imai R
; Kamada T
; Nitta Y
; Araki N
Oncotarget
2018[May]; 9
(33
): 22976-22985
PMID29796166
show ga
BACKGROUND: Unresectable pediatric osteosarcoma has poor outcomes with
conventional treatments. RESULTS: Twenty-six patients aged 11-20 years (median
16) had inoperable osteosarcoma of the trunk (24 pelvic, 1 mediastinal and 1
paravertebral) without any other lesion at initial examination. There were 22
primary, 1 locally recurrent and 3 metastatic cases. Median CIRT dose was 70.4 Gy
RBE (relative biological effectiveness) delivered in 16 fractions. Median
follow-up was 32.7 months. Overall survival was 50.0% and 41.7% at 3 and 5 years,
respectively. Ten patients survived for more than 5 years (range 5-20.7 years).
Local control was 69.9% and 62.9% at 3 and 5 years, respectively and
progression-free survival was 34.6% at 3 and 5 years. Only largest tumor diameter
correlated with 5-year overall survival and local control. There were 4 grade 3-4
CIRT-related late toxicities, 1 case of bone fracture and no treatment-related
mortalities. All patients (except 1) were able to ambulate after CIRT.
CONCLUSIONS: CIRT was safe and efficacious in the treatment of inoperable
pediatric osteosarcoma with improved local control and overall survival compared
to conventional treatments. METHODS: We retrospectively reviewed the records of
pediatric and adolescent patients who received carbon ion radiotherapy (CIRT) for
inoperable osteosarcoma between 1996 and 2014.