“…Regarding the studies' designs; Eight studies were retrospective in nature [13,16,19,20,22,[24][25][26], four were prospective [14,17,23,27], and two were case-control studies [15,21]. Seven studies included patients with T2DM [16][17][18][19][23][24][25], two studies included patients with T1DM [26,27], and six studies included patients with both type1 and type2 DM [13][14][15][20][21][22]. Lung cancer was reported in two studies [13,19], prostate cancer [16,22], thyroid cancer [21,26], colorectal cancer [18,25], different cancer types [14,27], biliary tract cancer (BTC) [20], breast cancer [15], pancreatic cancer [23], endometrial cancer [24], and bladder cancer [17].…”