Radioembolization with Yttrium-90 microspheres, page-3

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cafa

8,918 Posts.

24/04/15

08:58

Post #: 15146558

Originally posted by 6186mark ↑

Thanks cafa, I found this table particularly interesting. Previously I was under the impression that SIR-Spheres were "better" than Theraspheres. This table and the accompanying commentary says otherwise:

Table 1
Characteristics of commercially available Yttrium-90-microspheres for transarterial radioembolization (modified from Sangro et al[72])

1 SIR-Spheres1 TheraSphere2

2 Isotope 90Y Attached to the surface Incorporated into the glass matrix

3 Half-life (h) 64.1 64.1

4 Microsphere material Resin Glass

5 Microsphere diameter (μm) 20-60 20-30

6 Average size (μm) 32.5 25

7 Approximate activity per microsphere (Bq) 50 2500

8 Number of microspheres per 3 GBq 40-80 × 106 1.2 × 106

9 Specific gravity (g/mL) 1.6 3.6

10 Activity per commercially available vial (GBq) 3 (can be divided) 3, 5, 7, 10, 15, 20

11 Activity calculation Compartmental MIRD macrodosimetry or empirical formula based on liver volume and tumor volume Non-compartmental MIRD macrodosimetry

12 Estimated dose to the central vein area (Gy) in the montecarlo simulation3 59 58

13 Embolic effect Moderate Mild

14 Contrast agent injection During infusion None

15 Indication United States (FDA PMA): colorectal liver metastases United States (FDA HDE): hepatocellular carcinoma

Two types of microspheres loaded with 90Y are commercially available, one made of resin (SIR-Spheres; Sirtex Medical, Sidney, N.S.W., Australia) and an alternative made of glass (TheraSpheres, MDS Nordion, Toronto, Ont, Canada); the differences include the amount of activity contained in each microsphere and the number of microspheres injected in a single treatment (< 5 million to 10-30 million for glass and resin microspheres, respectively); however, their efficacy, toxicity and clinical outcome are similar (Table 1).

My comment - it appears that if Sirtex are going to be penetrate the HCC market they are going to have to fight off a reasonably strong incumbent - difficult if the outcomes are similar?

Expand

Correct - there is little difference. At he end of the day they both do the same job.

It will come down to marketing and that does rely to some extent on being first mover into any centre. SRX has a very good footprint on centres in the US and EU. Future markets are up for grabs.

However as long as we get some good data, then having a competitor is not the end of the world

The major difference is;

Column 1 Column 2 Column 3

0 Approximate activity per microsphere (Bq) 50 2500

The 'hotness' of any given bead. Any bead going off target will tend to cause more damage with the Thera as they are considerably hotter. Only time will tell if this is an issue or not.

	Column 1	Column 2	Column 3
0	Approximate activity per microsphere (Bq)	50	2500

SRX Price at posting: $23.13 Sentiment: Hold Disclosure: Held

1 Upvote

0 Great analysis

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1	SIR-Spheres1	TheraSphere2
2	Isotope 90Y	Attached to the surface	Incorporated into the glass matrix
3	Half-life (h)	64.1	64.1
4	Microsphere material	Resin	Glass
5	Microsphere diameter (μm)	20-60	20-30
6	Average size (μm)	32.5	25
7	Approximate activity per microsphere (Bq)	50	2500
8	Number of microspheres per 3 GBq	40-80 × 106	1.2 × 106
9	Specific gravity (g/mL)	1.6	3.6
10	Activity per commercially available vial (GBq)	3 (can be divided)	3, 5, 7, 10, 15, 20
11	Activity calculation	Compartmental MIRD macrodosimetry or empirical formula based on liver volume and tumor volume	Non-compartmental MIRD macrodosimetry
12	Estimated dose to the central vein area (Gy) in the montecarlo simulation3	59	58
13	Embolic effect	Moderate	Mild
14	Contrast agent injection	During infusion	None
15	Indication	United States (FDA PMA): colorectal liver metastases	United States (FDA HDE): hepatocellular carcinoma

Radioembolization with Yttrium-90 microspheres, page-3

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