Issue
4open
Volume 2, 2019
Disruption of homeostasis-induced signaling and crosstalk in the carcinogenesis paradigm “Epistemology of the origin of cancer”
Article Number 6
Number of page(s) 8
Section Life Sciences - Medicine
DOI https://doi.org/10.1051/fopen/2019005
Published online 25 April 2019

© B.L.D.M. Brücher & I.S. Jamall, Published by EDP Sciences, 2019

Licence Creative Commons
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Introduction

According to the American Cancer Society (ACS), the 5-year relative survival rate differs significantly according to cancer type with higher rates ≥90% for prostate cancer, melanoma, skin and female breast cancer compared to lower rates ≤18% in liver, lung, and pancreatic cancer [1]. Despite success in some cancer survival rates, these numbers differ by race, ethnicity, socioeconomics, health policy, geography, and age so the overall survival numbers ignore the large variations within any given group. According to the World Health Organization (WHO), the proportion of people over 60 years of age will increase to about 2 billion by 2050 [2]. Epidemiologically, cancer is an age-related disease which will be a major burden to healthcare worldwide along with neurologic, cardiovascular diseases, and diabetes [3]. While more advanced cancer stages reveal significantly lower survival rates [1] they may just represent clinical empiricism [4, 5] and do not explain the origin of cancer. “From a “birds-eye” view, it may appear that we have made little progress in eradicating cancer and that outcomes are largely based on the merits, or lack thereof, of any selected therapy” meaning to reach the proposed vision “Imagine a world without cancer” [6], we need to work much harder to understand the as yet unanswered questions that surround the origins of most cancers.

We have no clear information about the latency until cancer as a disease is first diagnosed. Fournier et al. proposed nearly 40 years ago that it would take some 16 years until breast cancer begins [7]. On the other hand, the growth rates especially in early cancers are extraordinarily slow [8]. Depending on when we observe cancer cells and what the latency period is, we describe cancer cells as being low, moderate or highly differentiated and anaplastic [4, 5]. Cell differentiation itself is not the only goal as human myeloid leukemia cells can differentiate into mature granulocytes by various agents such as butyrate, phorbol diesters, retinoic acid hypoxanthine, or dimethyl sulfoxide [9 reviewed in 10]. Even the proliferation rate does not provide a clue as one of the most rapid cell proliferations occurs during embryonic growth but humans do not have most cancers in utero. Even our understanding of precancerous lesions is limited. Kohler et al. [11 pointed out that some 50% of individuals will develop colorectal adenomas during their lifetime [12, 13], while over that same period, an increase of colorectal carcinomas without any genetic predisposition in individuals under 50 years of age was observed [1416]. Is the contribution of the environment undervalued here? We do not know when and how so-called precancerous lesions continue to develop until eventually forming a cancer cell. Low-grade gastric dysplasia even regresses in up to 50% of patients while higher grades of gastric dysplasia progress to cancer in up to 81% [17].

Until now, the main focus in cancer research has been on the somatic mutation theory (SMT) and the cancer stem cell (CSC) theory.

However, it makes a big difference if a normal cell undergoes cell transition until the first cancer cell (carcinogenesis) occurs compared to how cancer cells progress, migrate, and result in metastasis. An underestimated, but extremely significant bias in science is the difference between correct observations versus their interpretation, as the conclusion of proper findings can be wrongly labeled as being causative for a disease as for example, in the case of somatic mutations. The quote and metaphor “an apple found in a car is not synonymous of proof that apples grow in cars” [18] by using an image (Fig. 1) [18, 19] illustrates why “genetic studies have not led to a breakthrough in either the diagnosis or the treatment of cancers” [20].

thumbnail Figure 1

An apple found in a car is not synonymous of proof that apples grow in cars [18, 19].

Findings in biotechnology and genetics have, without question, stimulated our knowledge in biology. The popularity of the SMT increased since its grandfathers proposed it more than 100 years ago [21, 22].

The coincidence with the increase of the global biotech market may not just be accidental. The biotech market in the United States of America (USA), Canada, United Kingdom (UK), Germany, Japan, China, Brazil, and South Africa was estimated to be about $370 billion in 2016 and is expected to reach $727 billion by 2025 with a per annum growth rate of 7.4% [23]. This does not include the Indian biotech market which alone is expected to be $100 billion by 2025 [24] or the one in Russia which is expected to double to about $39 billion by 2021 [25]. Australia’s biotech market was about $7 billion in 2017 [26] and the United Arabian Emirates (UAE) market is projected to increase to $5.7 billion by 2020 [27]. Thus, by extrapolation the global biotech market could be somewhere between $880 billion and $1 trillion worldwide by 2025.

Somatic mutation theory (SMT)

Significant concerns arose in the 1960s as transplanted nuclei containing the genetic information from frog renal cancer cells into enucleated eggs resulted in various normal tissue without cancer [28] and that this was not due to primary “irreversible changes that prevent them from responding to the host environment” [29]. The weakness in the SMT was pointed out some 40 years ago and again more recently [30, 31]. Psychologists may would refer it as a kind of “Psychology of the crowd-effect” according to Gustave Le Bon [32].

For example, one inch of cancer tissue from the liver can have more than 100 million mutations and an identical mutation can result in different phenotypes [33]. This makes it very unlikely that somatic mutations by themselves are causative of most cancers [34]. A minority of cancers has been proven to be caused by mutations but these involve germline mutations, not somatic mutations. Mutations are found in cancerous tissues and in normal tissues and “many (perhaps most) mutations observed in cancer cells occurred prior to somatic evolution and may not contribute to the cell’s malignant phenotype” [35]. There is increasing evidence that the occurrence of “oncogenic” mutations is insufficient to explain cancer incidence [36]. It is evident that the process of cancer development, i.e., carcinogenesis, is not just derived from “simply clonally evolved epithelial cells that have accumulated a critical number of mutations but rather act as dysfunctional tissues where the mesenchymal component plays a critical role in tumour pathogenesis” [37 reviewed in 38]. An estimated 3.9% of deleterious germline mutations were found by sequencing 32 genes in an investigation of normal and cancer tissue in 854 patients with sporadic pancreatic ductal adenocarcinoma [39]. Furthermore, cancers do not need mutations to develop [40].

The observed somatic mutations in cancerous tissues appear to be later events and epiphenomena after the multistep sequence known as carcinogenesis has progressed beyond the precancerous niche (PCN) stage [31, 41, 42]. We now know that an identical mutation can result in different phenotypes [33] and there are even spontaneous in vivo reversion of mutations in non-cancer diseases [43, 44], revertant mosaicism of germline telomerase RNA component (TERC) mutations in the precancerous dyskeratosis congenita [45] or of an angiogenic phenotype to a non-angiogenic and dormant state in cancer [46]. The microenvironment itself can induce re-expression of E-cadherin and consequently result in mesenchymal to epithelial transition in breast cancer [47, 48].

The association of somatic mutations of tet methylcytosine dioxygenase 2 (TET2) in both humans and mice and the increase of hematopoietic stem cells with a net developmental bias towards the myeloid lineage was reported a decade ago [49]. However, the proof is still missing that such a mutation is mandatory for the creation of a pre-leukemic state and/or that a mutation is created by bacterial infections and events promoting the disruption of intestinal barrier function [50]. It was recently demonstrated that not just extrinsic non-cell-autonomous factors were required but that primary microbial-dependent inflammation was necessary for the creation of pre-leukemic myeloproliferation, which could be reversed by antibiotic treatment [51]. This suggests that no mutation is needed to induce even the pre-leukemic state.

Intratumor genetic heterogeneity is hard to distinguish from artifacts. Whole exome sequencing was shown to be unreliable with a false positive somatic mutation rate of 69% and 34%–80% of somatic variants are just noise [52]. The SMT is increasingly not seen any more to be the reason causing the majority of cancers [53]. The following should be noted: during development, DNA damage is associated with DNA replication resulting in inflammation [54].

Most recently, the breast cancer type 1/2 susceptibility protein (BRCA1/2) mutation prevalence in 5122 unselected Swedish breast cancer patients was shown to be <2% [55] and the prevalence of BRCA1/2 and partner and localizer of BRCA2 (PALB2) germline mutations in 2769 unselected breast cancer patients the Chinese population were 2.7% (BRCA1), 2.7% (BRCA2) and 0.9% (PALB2) [56]. The scientific community should be asking how it can be justified that BRCA genetic testing is already demanded by some biotechnology companies?

It was reported that in a healthy 59-year old man 129 582 spontaneous, genome-wide somatic mutations were observed in 140 single cell-derived hematopoietic stem and progenitor colonies with an estimation of the numbers of hematopoietic stem cells that are actively making white blood cells at any one time to be in the range of 50 000–200 000 [57]. Now, why is this healthy man not ill with dozens of diseases?

It was even pointed out that radiation cannot serve as the example to prove the SMT [31]. This is strongly supported by most recently findings, that the linear no-threshold hypothesis (LNT) from A-bombs elongated lifespan and reduced cancer mortality relative to non-irradiated individuals [58].

Even though we have known for decades that another cancer dogma “the cancer phenotype is permanent irreversible” is wrong and that established cancers can undergo spontaneous reversions, we still do not understand why and how. However, if genetic changes were causal, why might we observe cancer regressions? Not another mutation? We stretch the bounds of credibility to fit the observed facts to an incorrect theory! [5965].

Warburg theory

Another cancer dogma that also failed includes the assumption that cancer is caused by the Warburg effect, a term coined in 1972 [66] when Warburg and Cori observed that lactic acid is produced by cancer cells due to activation of anaerobic glycolysis [6772]. Thus, it was assumed that this would be “the” cause of cancer but it was later pointed out that “his conclusions are often misinterpreted” [reviewed in 73]. Even the Warburg effect can be oxidized [74] and if anaerobic glycolysis were to be the major source for carcinogenesis and not just an associated epiphenomenon observed in cancer, why does increased physical activity which goes in line with increased anaerobic glycolysis not associated with increased cancer incidence? Why is the opposite effect observed? [75, 76]. Moreover, glycolysis is “known to be common among developing or regenerating tissues, whether normal or neoplastic, and the tricarboxylic acid cycle to be basically intact in neoplastic tissues” [77].

Stem cell theory

Another cancer dogma that has gained popularity is the CSC theory though it originated some 150 years ago: Ernst Haeckel (1834–1919), a Professor of Zoology in Jena, Germany, “referred in his published lectures …. 1868 to unicellular organisms or protozoa, which he believed to be the phylogenetic ancestors of multicellular organisms, as Stammzellen (stem cells)” and in 1877 “applied the notion of stem cells to ontogeny against this background and used the name Stammzelle or Cytula to describe the fertilized egg cell as the cell of origin of all other cells of an animal or human organism” [78, 79 reviewed in 80]. Theodor Boveri (1862–1915) “described as Stammzellen those cells that derived from the fertilized egg cell and led to the primordial germ cell (German: Urgeschlechtszelle), and from which the various primordial somatic cells (German: Ursomazellen) branched off” [81 reviewed in 80]. According to Julius Cohnheim (1839–1894), “tumours arose from residual, displaced embryonic cells or rudiments” [82 reviewed in 80].

The transplantation of embryonal carcinoma cells into mice supported the stem cell theory of cancer [83] and injection of those cancer cells into early mice embryo blastocysts resulted in the reversibility of malignancy [84, 85]. Later an acute myeloid leukemia (AML)-initiating cell by transplantation into mice was observed [86] and CSCs were identified in leukemia [87].

Without question the CSC theory opened a new chapter in cancer research but serious concerns have been raised questioning its value to explain the vast majority of cancers especially that it “is likely that we are still evaluating the main population of tumour cells, which are not cancer stem cells, and are thus probably wasting time and losing essential treatment information” and that it is “unlikely that gene expression profiles obtained using the currently available methods reflect those of the tumour stem cell population, which forms only 0.1–2% of the whole tissue sample” [88]. Later, it was also proposed, that “misplaced epithelial stem cell which lands to the wrong location of stromal connective tissue by accident” would result in carcinogenesis [40].

Various pathogenic stimulus, such as infections by bacteria, viruses or fungi trigger chronic inflammation with increased cytokines such as interleukins, tumor necrosis factor (TNF), and platelet-derived growth factor; central roles in this regard have exemplary cytokines such as the interleukin 6 (IL-6) triggering chronic inflammation [89]. Transforming growth factor beta 1 (TGF-β1) signaling by fibroblasts is a key regulator in consecutive secondary remodeling of the extracellular matrix (ECM) and associated with worse prognosis in cancer patients [90].

This is triggered by chronic inflammation. One newly reported aspect is that chronic inflammation generates oxidation of circulating high-density lipoprotein (oxHDL) from native high-density lipoprotein (HDL) with a positive feedback mechanism through the oxHDLreceptor, lectin-like oxidized low-density lipoprotein receptor-1 (LOX-1), increasing NADPH oxidase 2 (NOX-2), TNF-α and LOX-1 via NOX-2/reactive oxygen species (ROS)/nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) axis inducing as well inducing disruption of homeostasis in systematic inflammation [91].

Another key regulator here is Lysyl oxidase (LOX). LOX mediates TGF-β1-induced fibrotic phenotypes in human skin-like tissues [92]. In terms of LOX isoforms, specifically, the enzymes lysyl hydroxylase 2 (LH2) or lysyl oxidase (LOX) and LOX-like 2 (LOXL2) are significantly upregulated and associated with poor patient prognosis in primary human oral squamous cell carcinoma (OSCC) [93]. The N-terminal neo-epitope site of LOXL2 is significantly elevated in serum from patients with breast, colorectal, lung, ovarian, pancreatic and prostate cancer, melanoma, IPF compared to healthy controls [94]. Applying the dual LOXL2/LOXL3 inhibitor, PXS-5153A, reduces crosslinks and ameliorates fibrosis [95].

Hypoxia-inducible factor 1-alpha (HIF-1α), TGF-β and LOX expression levels were significantly higher in human gastric cancer tissues as compared with that in adjacent tissues” and applying dextran sulfate reduced the number of invaded and migrated cells, cell proliferation and apoptosis in a dose‑dependent manner especially under hypoxic conditions [96]. The complexity of various signaling and crosstalk pathways provided in the manuscripts of this Special Issue is noteworthy. For example, recently a tumor growth control by eosinophils was demonstrated by applying the dipeptidyl peptidase DPP4 (CD26) inhibitor, sitagliptin, which resulted in an increase of C–C motif chemokine 11 (CCL11), higher rate of migration of eosinophils into solid tumor through IL-33 mediation, a pro-inflammatory mechanism [97].

The disruption of homeostasis in signaling and crosstalk as described in the “Epistemology of the origin of cancer” has been well-received in the scientific literature. The Nobel laureate, Professor Harald zur Hausen, pointed out that therapy against chronic inflammation with nonsteroidal anti-inflammatory drugs (NSAID) protects against some of the same cancers [98].

Summary

This is the time to stimulate research to a more pragmatic approach to cancer [99]. Findings in biology provide strong evidence for a more complex origin of carcinogenesis with a multistep sequence named “Epistemology of the origin of cancer: a new paradigm” [41], consisting of: (1) a pathogenic stimulus followed by (2) chronic inflammation from which develops (3) fibrosis with associated remodeling of the cellular microenvironment; and from these changes a (4) PCN, a product of fibrosis with remodeling by persistent inflammation, with widespread disruption of homeostasis across multiple signaling pathways, develops which triggers the deployment of (5) a chronic stress escape strategy and when this fails to resolve (6) results in a normal cell to a cancerous cell transition (NCCCT).

During a lengthy scientific process including molecular research (references not listed here), this paradigm of six steps leading to cancer [41] was developed in parallel with the understanding of biochemical and physiology signaling pathways [42] so that a new anticancer strategy could be clearly enunciated [6] and which explains why there is an undervalued syllogism “hysteron – proteron” which reverses both the temporal and logical order occurring during carcinogenesis in that the first (somatic mutation) occurs only after the second (onset of cancer) [31] as well as molecular explanations in genomics, microRNA, epigenetics, and proteomics [100].

The cancer paradigm “Epistemology of the origin of cancer” supports not just the fact that inflammation and fibrosis are necessary conditions to the development of cancer, they provide many targets for interdicting the process of carcinogenesis. Furthermore, inflammation and fibrosis are one of the universal bases of any cellular biochemical physiology and pathology.

Our goal is to cohesively weave together a detailed set of explanations of the disruption of homeostasis through complex interrelationships of various signaling and crosstalk pathways through available in vitro and in vivo data to elucidate the 6-step sequence of carcinogenesis which explains how the majority of cancers occur from the following Special Issue “Disruption of signaling homeostasis-induced signaling and crosstalk in the carcinogenesis paradigm Epistemology of the origin of cancer” containing:

  1. Prelude and Premise to the Special Issue,

  2. Undervalued ubiquitous proteins,

  3. Chronic inflammation evoked by pathogenic stimulus during carcinogenesis,

  4. Eicosanoids during carcinogenesis,

  5. Microbiome and morbid obesity increase pathogenic stimulus diversity,

  6. PCN, a product of fibrosis with remodeling by incessant chronic inflammation,

  7. Transition from normal to cancerous cell by PCN induced chronic cell-matrix stress,

  8. Metformin alters signaling homeostasis,

  9. NF-κB during carcinogenesis, and

  10. Synopsis.

Nomenclature of abbreviations

ACS: American Cancer Society

AML: Acute myeloid leukemia

BRCA1/2: Breast cancer type 1/2 susceptibility protein

CCL11: C–C motif chemokine 11

CD26: Dipeptidyl peptidase DPP4

CSC: Cancer stem cell theory

HDL: High-density lipoprotein

HIF‑1α: Hypoxia-inducible factor 1-alpha

IL-6: Interleukin 6

LNT: Linear no-threshold hypothesis

LOX: Lysyl oxidase

LOX-1: Lectin-like oxidized low-density lipoprotein receptor-1

LOXL2: LOX-like 2

NCCCT: Normal cell to cancerous cell transition

NF-κB: Nuclear factor kappa-light-chain-enhancer of activated B cells

NOX-2: NADPH oxidase 2

NSAID: Nonsteroidal anti-inflammatory drug

OSCC: Oral squamous cell carcinoma

oxHDL: Oxidation of circulating high-density lipoprotein

PALB2: Partner and localizer of BRCA2

PCN: Precancerous niche

ROS: Reactive oxygen species

SMT: Somatic mutation theory

TERC: Telomerase RNA component

TET2: Tet methylcytosine dioxygenase 2

TGF-β1: Transforming growth factor beta 1

TNF: Tumor necrosis factor

UAE: United Arabian Emirates

UK: United Kingdom

USA: United States of America

USD: US Dollar

WHO: World Health Organization

Acknowledgments

The manuscripts of this Special Issue were supported by the Theodor-Billroth-Academy® (TBA®) and INCORE (International Consortium of Research Excellence) of the (TBA®). We express our gratitude to the discussions on the web group of the Theodor-Billroth-Academy® (TBA®) on LinkedIn, the exchange with scientists at Researchgate.com, as well as personal exchanges with distinguished colleagues who stimulated our thinking all named individually earlier in publications – we thank each one.

Conflict of Interest

The author reports the following conflict of interest: Björn LDM Brücher is Editor-in-Chief in Life Sciences-Medicine of 4open by EDP Sciences. Ijaz S. Jamall is Senior Editorial Board member in Life Sciences-Medicine of 4open by EDP Sciences. The authors, of their own initiative, suggested to the Managing Editorial to perform a transparent peer-review of their submittals. Neither author took any action to influence the standard submission and peer-review process, and report no conflict of interest. The authors alone are responsible for the content and writing of the manuscript of this Special Issue. This manuscript contains original material that has not previously been published. All authors contributed on its contents and approved the different manuscript.

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An apple found in a car is not synonymous of proof that apples grow in cars [18, 19].

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