TOPIC: Velpatasvir - Everything you ever wanted to know and more

The European Medines Agency public assessment report provides some intersting ingights into Sof+Vel

www.ema.europa.eu/docs/en_GB/document_li...4210/WC500211152.pdf

p55

Velpatasvir was relatively rapidly absorbed with a tmax of 3 h after administration of the SOF/VEL FDC
tablet in healthy volunteers. The solubility is pH dependent (41 mM at pH 2 and <0.11 mM at pH 5) and
in FaSSIF and FeSSIF the solubility was <11 µM and 11 µM, respectively.

Co-administration of velpatasvir with sofosbuvir has an effect on exposure of sofosbuvir (approx. 2-fold
increase).

pp60

Female subjects had a lower CL/F of VEL and SOF compared to male subjects, resulting in an
approximately 50% and 20% higher exposure, respectively, compared to male subjects.

pp61

The solubility of VEL is pH dependent and therefore medical products that increase gastric pH are
expected to decrease plasma concentration of VEL.

pp91

Thanks for posting this Dr. Freeman.

A quick read shows that the addition of ribavirin (RBV) to VEL/SOF when NS5A RAVs are present yields significantly better results (GT1).

I recall reading about similar trends when RBV is added to DCV/SOF – wonder if this is correct. And I also wonder if the same applies to LDV/SOF.

The GT3 results with the addition of RBV are also interesting - even considering the small number of patients.

Page 85:

Prevalence of NS5A RAVs and Impact on Treatment Outcome

In genotype 1 HCV-infected patients, the SVR12 rates in patients with or without pre-treatment RAVs were similar in the SOF/VEL+RBV 12 Week group, in contrast to the SOF/VEL 12 and 24 Week groups, where patients with baseline RAVs had lower SVR12 rates (80% and 90%) compared to patients without RAVS (96% and 98%), respectively.

Interpretation of the results in patients with genotype 3 HCV infection is limited by the small number of patients with NS5A RAVs in each treatment group. In GT3 patients without baseline NS5A RAVs, SVR12 rates were superior in the SOF/VEL/RBV group (91%) compared to the two SOF/VEL groups (60 and 50%, in the 12 and 24 week groups, respectively).

All patients with genotype 2, 4, or 6 HCV infection achieved SVR12 irrespective of the presence of pre-treatment NS5A RAVs.
__________

Have had my share of RBV to be sure – and have planned to include it yet again for retreatment. Results like this seem to bolster the decision.

J

Thanks Dr Freeman,

Very heartening - particularly for us harder to treat folk. A couple of sentences for the non-experts like me sound pretty good "unprecedented SVR rates in chronic HCV infection" and "the adverse effect profile of SOF/VEL does not stand out as different from placebo".

"Interpretation of the results in patients with genotype 3 HCV infection is limited by the small number of patients with NS5A RAVs in each treatment group. In GT3 patients without baseline NS5A RAVs, SVR12 rates were superior in the SOF/VEL/RBV group (91%) compared to the two SOF/VEL groups (60 and 50%, in the 12 and 24 week groups, respectively)."

So this is for Gt3 relapsers that have RAV?

Hi Split,

Those percentages were in relation to the Astral-4 trial where all patients had decompensated cirrhosis. But the report also goes on to state:


My reading of that is they are recommending addition of Riba for those with cirrhosis, relapse or both. But I'm learning on the job so run it past someone with better qualifications than me.

So if I add Riba to the Sof/Vel, that would push it to, what, 98%?

I think it will depend on your fibrosis levels and which RAVs you have if any. How long was your previous Tx, was it just 12 weeks or some extension of that?

(Personally, while I share your enthusiasm about Velpatasvir's potential I'm still researching my situation and gathering my thoughts at the moment and will post in my relapse thread once I have but my situation may be a little different in that I have cirrhosis and two 24 week Tx fails that included Riba already so feel the need for caution to ensure I don't lock out future possibilities.)

I did 16 weeks to be safe. (Sof/Dac)
I think I will order RAV and fibrosis test this time around.

Thank you for information!
J. Eugene, RAVs matter mostly in those with fibrosis.
The study found that baseline RAVs significantly influence SVR in people with decompensated cirrhosis. Baseline RAVs do matter for non-cirhotic people, esp. for 3 patients (and slightly, for gen 1a). But for other genotypes (like 2,4,1b) they matter less. It's not all black-and-white, of course, and baseline RAVs do have an influence for certain combinations of genotype and fibrosis level, but the statistics in the EMA report was for participants with decompensated cirhosis.