Identifying drug-pathway association pairs based on L₁L_2,1- integrative penalized matrix decomposition

The traditional methods of drug discovery follow the "one drug-one target" approach, which ignores the cellular and physiological environment of the action mechanism of drugs. However, pathway-based drug discovery methods can overcome this limitation. This kind of method, such as the Integrative Penalized Matrix Decomposition (iPaD) method, identifies the drug-pathway associations by taking the lasso-type penalty on the regularization term. Moreover, instead of imposing the L₁-norm regularization, the L_2,1-Integrative Penalized Matrix Decomposition (L_2,1- iPaD) method imposes the L_2,1-norm penalty on the regularization term. In this paper, based on the iPaD and L_2,1-iPaD methods, we propose a novel method named L₁L_2,1- iPaD (L₁L_2,1-Integrative Penalized Matrix Decomposition), which takes the sum of the L₁-norm and L_2,1-norm penalties on the regularization term. Besides, we perform permutation test to assess the significance of the identified drug-pathway association pairs and compute the P-values. Compared with the existing methods, our method can identify more drug-pathway association pairs which have been validated in the CancerResource database. In order to identify drug-pathway associations which are not validated in the CancerResource database, we retrieve published papers to prove these associations. The results on two real datasets prove that our method can achieve better enrichment for identified association pairs than the iPaD and L_2,1-iPaD methods.