{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Cancerous inhibitor of protein phosphatase 2A (CIP2A) is emerging as a multifunctional oncoprotein that plays a central role in malignant transformation by inhibiting PP2A activity and thereby stabilizing key oncogenic drivers. Through its ability to block PP2A‐mediated dephosphorylation, CIP2A prevents proteolytic degradation of proteins such as c‐Myc, leading to sustained proliferative signaling and enhanced tumorigenic potential."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": " In addition, CIP2A contributes to cell transformation by promoting anchorage‐independent growth and by engaging in feedback loops that further amplify oncogenic signaling, such as through interactions with E2F1 and the Akt pathway."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "10"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n CIP2A is overexpressed in a wide range of human malignancies—including cancers of the breast, lung, stomach, ovary, prostate, and head and neck—and its elevated expression often correlates with high tumor grade, increased invasiveness, resistance to apoptosis, and poor patient prognosis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "11", "end_ref": "17"}]}, {"type": "t", "text": " Structural studies further reveal that CIP2A forms homodimers to interact with PP2A subunits, a feature that may be exploitable for targeted therapeutic strategies."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "18"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Beyond c‐Myc stabilization, CIP2A modulates several signaling pathways including those governed by Akt, mTORC1, and MEK/ERK, thereby influencing diverse cellular processes such as mitotic progression, cell survival, epithelial–mesenchymal transition (EMT), and autophagy."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "19", "end_ref": "23"}]}, {"type": "t", "text": " Furthermore, CIP2A overexpression may be driven by oncogenic signaling through transcription factors such as ETS1 and IL-10/PI3K–mediated mechanisms, while also being subject to regulation by microRNAs (e.g., miR-375) and viral oncoproteins like HPV E7 or Helicobacter pylori CagA."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "24", "end_ref": "28"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In clinical settings, high CIP2A expression has been linked to aggressive tumor phenotypes, including advanced stage, lymph node metastasis, and poor overall survival in cancers such as colorectal, cervical, and renal carcinomas."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "29", "end_ref": "32"}]}, {"type": "t", "text": " Importantly, preclinical studies demonstrate that depletion or pharmacological targeting of CIP2A—using agents such as tamoxifen, erlotinib, afatinib, bortezomib, or natural compounds like polyphyllin I and cucurbitacin B—can restore PP2A activity, reduce oncogenic signaling, and sensitize cancer cells to apoptosis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "33", "end_ref": "39"}]}, {"type": "t", "text": " Additionally, CIP2A upregulation by oncogenic pathogens and its role in mediating resistance to radiotherapy further highlight its potential as a clinically relevant biomarker and therapeutic target."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "40", "end_ref": "46"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Finally, proteasome-independent mechanisms—such as those involving autophagy—have also been linked to CIP2A modulation, adding another layer to its regulation of tumor cell homeostasis and survival."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "47"}]}, {"type": "t", "text": " Collectively, these studies underscore the central role of CIP2A in orchestrating oncogenic signaling networks and advocate for its further exploration as a diagnostic and therapeutic target across diverse cancer types.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Melissa R Junttila, Pietri Puustinen, Minna Niemelä, et al. 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