Question: Using Varscan without a matched normal
gravatar for sugus
18 months ago by
China Pharmaceutical University
sugus50 wrote:

Hi there,

I got an extremely incredible use of varscan.

You see, typically, we need a matched-normal sample as an input for varscan for somatic mutation calling.

However, if I used a matched-primary tumor as so-called normal baseline, and another matched-metastasis tumor sample, does it mean anything when I use this combination to call mutation?

Excuse me for this weird question, I just wondering if it means anything.

Many thanks advanced.

wes varscan • 628 views
ADD COMMENTlink modified 18 months ago by Chris Miller21k • written 18 months ago by sugus50
gravatar for Chris Miller
18 months ago by
Chris Miller21k
Washington University in St. Louis, MO
Chris Miller21k wrote:

Somatic calling is essentially just calling differences between two samples. If you use a tumor as your control and a metastasis as your case, then you'll call metastasis-specific mutations (but will miss any somatic mutations shared between the tumor and met).

ADD COMMENTlink written 18 months ago by Chris Miller21k

Thank you, I just need to confirm this is worth trying.

ADD REPLYlink written 18 months ago by sugus50

I think you will need to have several rounds of analysis and discussion for your projects.

So, having exposure to a certain amount of ideas is important, but you also need first-hand experience to be confident in your results. In other words, if you think something is worth trying, then you should proceed with that test and use that experience to guide future decisions :)

However, I am very grateful for the wonderful feedback that I have received on Biostars, and I hope this helps give you the confidence to design tests / experiments to help you understand phenomenon better (based upon criteria that you understand and feel comfortable with). Best of luck for your project!

ADD REPLYlink written 18 months ago by Charles Warden8.0k

Yeah, i am working on this. Thanks for this sweet encouragement :)

ADD REPLYlink written 18 months ago by sugus50
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