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PASS predicts with high accuracy (>80%)  up to 3750 biological activities for your compounds. As input you only need the 2D structure. Since it is trained against a huge number of activities it can be used for many different projects. This is one of the most successful programs giving you early indications if your compounds might be useful. This is a very easy tool for in silico screening. 

A typical example:

PASS was trained on a special set of compounds. There were 5000 compounds containing 200 hits. With PASS 50 structures were selected, 25 were hits. Assume one test is 1 dollar. If the distribution of the hits would be equal in the database of 5000, you need to spend 5000/200*25 = 625 dollars to find 25 hits. With PASS you would need 50 dollars. This is a saving of 625/50 = 1250%!

Why should you use PASS?

• Find out possible biological effects of a compound.

• Find out unwanted side effects, quickly.

• Buy compounds that are promising candidates (click here to see an application).

• Select the most likely candidates for screening.

• Adjust your screens according to the predicted activities.

• Find new therapeutic areas for compounds with known activity.

• Analyze your dataset:
  • drug versus non-drug like (see reference Anzali et.al.)
  • cluster the dataset using the PASS parameters or the MNA descriptor keys
  • select compounds that belong to an activity class

All you require is the structure in the form of a MOL or SDFile. The prediction goes very fast. Calculation of biological activity spectra for 10,000 compounds on an ordinary IBM PC takes about 5 min. So you can do it for large data sets. 

The training set includes at the moment ca. 205'873 substances with more than 5462 biological effects. PASS predicts simultaneously the probabilities of presence (Pa)/absence (Pi). PASS Pro is open; therefore the user can add to the training set some new biologically active compounds and new activities. Mean accuracy of prediction in LOO cross-validation is ~95%.

Go an read about applications of PASS in R&D.

New features of release 2012:
•	Improved structure-activity relationship (SAR) Base contains 313,345 substances and 75,875 descriptors.
•	Number of predictable activity types has increased by more than 3000 terms, and number of recommended activity types has increased by more than 2000 terms.
•	The number of predictable effects on gene expression has considerably been increased by more than 1500 terms.
•	The number of predictable mechanisms of action has been increased by more than 470 terms.
•	New functionality has been added, enabling now direct communication between PASS and structure-drawing programs, e.g. MarvinSketch – Copy any individual structure from PASS directly to clipboard, as Bitmap or as MOL file – Open a structure in PASS directly from clipboard