CDK4 and squamous cell carcinoma: Among the aberrations co-observed, CDK4 amplification was most commonly noted in patients with soft tissue liposarcoma (9 of 16 patients), and CDKN2A/B loss was seen in one patient each with breast cancer not otherwise specified (NOS), adenocarcinoma of the lung, soft tissue liposarcoma, squamous cell carcinoma of unknown primary, and bladder urothelial carcinoma.