[Sifat Mekanik Komposit Sandwich dengan Kulit Polyester/Woven Roving E Glass dan Inti Honeycomb Polypropylene Menggunakan Teknik Fabrikasi VARI dan Adhesif Cold-Press = Mechanical Properties of Sandwich Composite with Polyester/Woven Roving E Glass Fiber Skin and Polypropylene Honeycomb Core Using VARI and Cold-Press Adhesive Fabrication Techniques, Deteksi Gen CK20 pada Circulating Tumor Cells (CTC) dan Serum Darah dari Penderita Kanker Kolorektal = Detection of CK20 Gene in the Circulating Tumor Cells (CTC) and Blood Serum of the Colorectal Cancer Patients]