This is a large phase 2 trial (3,000+ patients screened) with a variety of solid tumors. It will involve a biopsy sample being genetically sequenced to find specific mutations. If mutations are found that have a specific targeted therapy, patients, regardless of tumor source), will be enrolled in that arm of the trial. This means that whether a tumor is from a lung, a breast or the pancreas, if it has a targetable mutation it will be treated for that mutation.

Here are a couple of links that describe it further:

cancer.gov - NCI - MATCh

oncotherapynetwork - Precision Medicine Reaches New Level

There are already quite a few sites enrolled, and eventually there will be many more added:
NCI MATCh - Site List

You can scroll up in the site list and find eligibility requirements, etc..