Microarray analysis was performed as follows. Total RNA was extracted by lysing the tissues with
Isogen (Nippon Gene) following homogenization with a TissueLyser (Qiagen AB). Total RNA (500 ng) was used to generate biotin-labeled cRNA using a GeneChip
® 3′ IVT PLUS Reagent kit (Thermo Fisher Scientific, Inc.). The biotin-labeled RNA was hybridized to Human Genome U-219 Array Strips (Thermo Fisher Scientific, Inc.). After washing and staining the strips, the signal was developed and scanned using
GeneAtlas (Thermo Fisher Scientific, Inc.). Data analysis was conducted using
GeneSpring GX 14.9.1 (Agilent Technologies GmbH). The robust multichip average method was used with background correction and normalization. Fold change analysis was performed to identify genes with >3-fold differences, using a moderated t-test (P<0.05) with Benjamini-Hochberg multiple correction. Gene expressions of KRT8, ABCC3, GCLC, RYBP, TMEM97, SLC1A3, IRS2, KYNU, CSAG2, CDA and CCL21 in head and neck SCCs (528 cases) from the cancer genome atlas were analyzed by OncoPrint from cBioPortal. Microarray data have been deposited in the Gene Expression Omnibus (GEO; experiment. no. GSE153918) database using minimum information about microarray experiment guidelines. The algorithm of the clustering method for the microarray data is shown in
Fig. S1.
Hasegawa T., Nakashiro K.I., Fukumoto C., Hyodo T., Sawatani Y., Shimura M., Kamimura R., Kuribayashi N., Fujita A., Uchida D, & Kawamata H. (2021). Oral squamous cell carcinoma may originate from bone marrow-derived stem cells. Oncology Letters, 21(2), 170.