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Clinicopathologic Features of Diaphyseal Osteosarcoma
Anne N. Normand, MDPatrick P. Lin, MDNorman Jaffe, MDRobert S. Benjamin, MD Shreyaskumar R . Patel, MDChristopher P. Cannon, MDValerae O. Lewis, MDA. Kevin Raymond, MDAlan W. Yasko, MD, MBA
CTOS Meeting
November 2005
High-grade intramedullary osteosarcoma
• Most common in metaphyseal region of long bones
• Rare in the diaphyseal region– Previously reported to occur <10% of cases– Site of osteosarcoma variants (eg, periosteal,
high-grade surface OS)
Bone: Structural Differences
• Metaphysis– Many trabeculae
– Thin cortices
– Rich vascular supply
– Vascular sinusoids
– Large surface area exposed to circulation
– Extensive remodeling, growth
• Diaphysis– Fewer trabeculae
– Thick lamellar cortical bone
– Nutrient artery & periosteum
– Diffusion
– Slower bone turnover
– Slower healing
Literature
• Sim et al, 1995 – Mayo Clinic
– 51 cases
– 1912-1979
– ~7% of all long bone OS treated during that period
– No chemotherapy protocols
– 73% (38/51) no chemo
– 5-year survival 29%
• Haworth et al, 1981– Bristol Royal Infirmary
– Radiographic review
– Heterogeneous presentation, broad DDx
– 5-year survival 23%
Hypothesis
• Diaphyseal and metaphyseal bone differ anatomically and metabolically.
– Clinicopathologic features of tumors may differ
– Response to treatment may differ
Purpose
• Describe clinicopathologic features of diaphyseal osteosarcoma
• Determine differences in outcome between diaphyseal and metaphyseal osteosarcoma with contemporary treatment
Materials & Methods
Study Design
• Retrospective review
• High-grade intramedullary OS of long bones
• 1980 to 1999
• 5-year potential follow-up
• 51 diaphyseal, 240 metaphyseal
Exclusion criteria
• Surface OS
• Low- and intermediate-grade OS
• Secondary OS
Definition: Diaphyseal OS
• Epicenter within the area between parallel cortices– Radiographic
– Pathologic
Treatment algorithm
• Pre-operative chemotherapy - 4 cycles
• Surgical treatment
• Post-operative chemotherapy - tailored– Good responders (≥90%)
– Poor responders (<90%)
Pre-op chemotherapy
• Intra-arterial cis-platin (120 mg/m2)
• Intravenous doxorubicin (90 mg/m2)
• 4 cycles
Surgical treatment
Diaphyseal Metaphyseal
Amputation 12 42
Limb-salvage
39 198
p = 0.321
Post-operative chemotherapy
• Good responders - short course– IV cis-platin– IV doxorubicin
• Poor responders - extended course– High-dose methotrexate (12.5 g/m2)– High-dose ifosfamide (14 g/m2)
Statistics
• Kaplan-Meier analysis– Disease-specific survival – Log rank test
• Chi-square test
• Independent student’s t test
Results
DemographicsDiaphyseal Metaphyseal p
Number 51 240
Age (yrs)
Mean
Range
22
4-72
19
4-75
0.286
Gender
Male
Female
31 (61%)
20 (39%)
141 (59%)
99 (41%)
0.869
F/u (mo.)
Mean
Range
106
3-288
99
1-283
0.177
Stage
Non-metas
Metastatic
48 (94%)
3 (6%)
225 (94%)
15 (6%)
0.916
Affected sites
p=0.339
Presentation
• Symptoms – Pain most common
– Local swelling, mass
• Pathologic fracture– Diaphyseal 9/51 (18%)
– Metaphyseal 39/240 (16%)
– p = 0.657
Radiographic presentation
Lytic Mixed Blastic
Histology
Metaphyseal
TELANGIECTATIC
SMALL CELL
OSTEOBLASTIC
MIXED
FIBROBLASTIC
CHONDROBLASTIC
Diaphyseal
TELANGIECTATIC
SMALL CELL
OSTEOBLASTIC
MIXED
FIBROBLASTIC
CHONDROBLASTIC
Tumor necrosis
Diaphysis Metaphysis
Good 16 134
Poor 32 96
p = 0.0016
Disease-specific survival
Follow-up (months) (p=0.499)
300240180120600
DSS
1.0
.8
.6
.4
.2
0.0
Metaphyseal
Diaphyseal
Disease-specific survival
Diaphyseal Metaphyseal
5 years 62% 69%
10 years 59% 60%
20 years 56% 60%
DSS & Tumor Necrosis
Follow-up (months)
300240180120600
DSS - Tumor necrosis >90%
1.0
.8
.6
.4
.2
0.0
Metaphyseal
Diaphyseal
Follow-up (months)
300240180120600
DSS - Tumor necrosis <90%
1.0
.8
.6
.4
.2
0.0
Metaphyseal
Diaphyseal
Impact of metastatic disease
Follow-up (months) (p=0.21)
300240180120600
DSS - Metastatic disease
1.0
.8
.6
.4
.2
0.0
MetaphysealDiaphyseal
Discussion
Similarities
• Diaphyseal & metaphyseal OS share many features– Age– Gender– Sites– Presentation– Histological subtypes
Key Difference Response to pre-op chemotherapy
• Diaphyseal OS less sensitive than metaphyseal OS to doxorubicin & IA-cisplatin
– ?Anatomical/vascular/structural differences
Similar outcomes
• Disease-specific survival same
• Supports tailoring of post-op chemotherapy– Switch to HD-MTX & HD-IFX– Historical data
• survival w/ poor response to pre-op chemo significantly worse
Conclusion
• Clinicopathological characteristics of diaphyseal OS are similar to metaphyseal OS
• Diaphyseal OS responds less well to pre-op chemo
• Tailoring of post-op chemo for poor responders to include HD-MTX & HD-IFX may be important to achieve good survival
Thank you