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Historical perspective on the development and evolution of eyes and photoreceptors.

The development and evolution of eyes is an "old problem" in biology, which required a special treatment in Charles Darwin's "Origin of the species" (1882) under the heading of "Difficulties of the theory". Darwin postulated a simple and imperfect eye, as a prototype, which can vary and evolve under natural selection into more complex and perfect eyes. Based upon morphological criteria and the different modes of development of the different kinds of eyes, neodarwinists have postulated that the various eye-types are polyphyletic in origin and that the eyes have evolved independently in the various animal phyla. Recent developmental genetic experiments and molecular phylogenetic analyses cast serious doubts on this interpretation and argue strongly for a monophyletic origin of the eyes from a Darwinian prototype and subsequent divergent, parallel and convergent evolution leading to the various eye-types.

Animals↗

[Contraception before pregnancy. Evolution between 1972 and 1975 in the Rhone-Alpes region (author's transl)].

The studies was made from two enquiries carried out on women who delivered in June 1972 and 1975 in the Rhone-Alpes region. Contraception therefore dealt exclusively with birth control before a pregnancy. It is clear that contraception has developed significantly: it is practised by 48% of women who were questioned in 1975 as compared with 41% in 1972. There is also a change in the last method used between the two dates: the pill featured in only 17% of all the method used in 1972 and 45% in 1975: on the other hand coitus interruptus went down from 41% to 21%. The spread of the use of the pill is a generalised phenomenon whereas there are several categories of women who do not seem to have used, coitus interruptus less frequently. As far as the social classes are concerned, it is to be pointed out that only non-skilled working-class people have not changed their habits as far as these two methods are concerned. Contraception is practised with more and more success as a method of birth control: on the one hand the number of conceptions which occurred when the women was using a birth control method has gone down from 27% in 1972 to 15% in 1975: on the other hand 51% of those who used a birth control method stopped using it in order to have a baby, whereas in 1972 only 32% did so. Parallel with this evolution, one can point out that the number of women who have 2 or more children has gone down. On the other hand the number of conceptions before marriage and the rhythm of the way the families are constituted has not changed between the two dates.

Adolescent↗

Evolution of energy expenditure and nitrogen excretion in severe head-injured patients.

OBJECTIVE: The aim of the study was to estimate the influence of therapeutic changes on the level of energy expenditure (EE) and N excretion in a homogeneous group of patients usually considered hypermetabolic. DESIGN: EE and N excretion of head-injured patients were measured simultaneously at phases 1 and 2 (patients treated 4 +/- 3 and 18 +/- 8 days after injury, respectively). SETTING: Acute care hospital. PATIENTS: Eight severe head-injured patients, mean weight 63.1 +/- 6.1 (SD) kg, mean age 21 +/- 3.8 (SD) yr. INTERVENTIONS: At phase 1, all patients were sedated with fentanyl (6.7 +/- 1.9 micrograms/kg.hr) plus flunitrazepam (9.1 +/- 4.8 micrograms/kg.hr) and were mechanically ventilated. All patients received continuous total parenteral nutrition. The nonprotein caloric intake averaged 1092 +/- 200 kcal/day, including 77% glucose and 23% fat (Intralipid 20%). The total N intake averaged 7 +/- 5 g/day, consisting of crystalline amino acids. At phase 2, no patient received any sedative and all were breathing spontaneously via tracheostomy. All patients received parenteral and/or enteral nutrition. The nonprotein caloric intake averaged 1929 +/- 200 kcal/day consisting of 65% carbohydrates and 35% fat. The total N intake averaged 13 +/- 2 g/day. MEASUREMENTS AND MAIN RESULTS: The EE was significantly higher at phase 2 than at phase 1 (2121 vs. 1737 kcal), but the interindividual variability was low at both phases. N excretion was high at the two periods of the study and not correlated to the level of EE. The RQ was 0.75 at both periods, indicating predominant fat oxidation. CONCLUSIONS: We could not demonstrate any parallelism in the evolution of EE and protein catabolism in head-injured patients. The therapeutics (mechanical ventilation, sedation, and nutrition) have a major effect on EE but little on N excretion.

Adult↗

[The origin of informed consent].

The principle of informed consent, aimed at the lawfulness of health assistance, tends to reflect the concept of autonomy and of decisional autodetermination of the person requiring and requesting medical and/or surgical interventions. This legal formula, over the last few years, has gained not only considerable space but also importance in the doctrinal elaboration and approaches, as well as juridical interpretations, thereby influencing the everyday activities of the medical profession. Informed consent is still the object of continuous explorations, not only asfar as concerns the already confirmed theoretical profile but, instead, the ambiguous practical and consequential aspect. Analysing how the concept and role of consensus was born and developed with the more adequate and reasonable excursions to make it valid and obtain it, it is impossible not to take into consideration, on the one hand, the very ancient philosophical origins and, on the other, the fact that it was conditioned by religion with the moral aspects and the accelerated deontological evolution with pathways parallel to the needs and the progress offered by new forms of treatment and novel biotechnological applications. The principle of consent is a relatively new condition. In fact, already in the times of not only the Egyptian civilisation, but also the Greek and Roman, documents have been found which show how the doctor's intervention had, in some way, first to be approved by the patient. Plato (law IV) had already foreseen the problems, the procedures and the modes of information which are, in synthesis, at the root of the principles of the present formula of informed consent and correlated the practice of the information and consensus with the quality and social position of the patient. The only guarantee that the patient might have, derived from a fundamental principle of medicine of all times: "in disease, focus on two aims, to improve and not to cause damage". A figure can be recognised, in the Hippocratic physician, that cared about the patient's suffering, but never neglected looking after his own outcome, endeavouring to avoid becoming involved in lack of success and death of a patient. The concept of consensus is inexistent, albeit, there is an awareness of the presence of precautious and preventive information. In the behaviour of doctors, in ancient times, it is not difficult to recognize the true motives and the real reasons that, already in those days, give rise to the necessary "defensive medicine" particularly as far as concerns the social status of the patient. Already from the early origins, continuing the Hippocratic tradition, the relationship between doctor and patient was consolidated, based upon two very definite criteria, represented, on the one hand, by the professional duty of the physician to do what is bestfor the patient and, on the other, the duty of the patient to completely accept the physician's decisions and intervention. The Hippocratic physician respected a principle of professional responsibility which was more religious and of a moral type, but, from a legal point of view, very weak inasmuch as it depended upon regulations elaborated by human beings. The conviction and certainty that the physician acted, in the interest of his patient's well-being, has been passed down over the centuries endowing the physician with moral authority and a kind of legal impunity, conditions which corresponded, in an almost reflection-likefashion, with the duty of obedience and subjection, on the part of the patient. Christianity was grafted into this consolidated vision of the sacral character of medicine and medical practice, which did not substantially change the Hippocratic type of ethical behaviour. Non only the population but also the Christian physician was aware of the religious importance of his intense activity as a mission and compared to a special kind of priesthood in safe-guarding health, considered as a gift of God. Therefore, invested with this authority which derived from his professional role and from his very work, he felt it his duty to guide the patient, deciding and for him. The patient is an ignorant person who does not have the knowledge, the intellectual capacity or moral authority to oppose or disagree with the wishes and decisions of the physician who, instead, on account of his doctrine, knows exactly what is goodfor him. In this regard, if we were to speak of consensus concerning the physician's intervention, he would be considered useless in as much as obvious and understood when seeking help. The attitude of the patient towards the physician has always tended to one of strong faith and characterized by psychological subjection borne out by traditions thousands of years old. A patient who was sick, again, as an attitude of respect and gratitude, followed the treatment but never asked for any explanations regarding the therapeutic effects and the physician refrained from taking any initiative to inform the patient or his/her family. Each phenomenon, therefore, has a precise origin, a well-defined history and when its importance tends to significantly condition the activities concerning Man, a desire emerges to learn the origin and the history. As is well known, a trial commenced in Nuremberg, on December 19, 1946, of Nazi doctors and a code was defined in which the judges, all Americans, clearly emphasized a view of medical research and technology: science should never transform or consider human beings as an instrument to be employed for scientific purposes. In actual fact, documents exist providing evidence that a few decades before the drawing up of the Nuremberg Code, the need had been expressed, in Germany itself to somehow make medical interventions and actions legal by means of the use and practice of consensus. The moral and ethical principles in those documents, even if not available as bibliographic references in the English literature, certainly merit, from a historical viewpoint to be considered as conceptual elements and doctrinal and socio-cultural products, even if at that time, of little practical importance, which belong to the European culture and, in particular, and almost paradoxically, in the light of what happened, to the German culture. The United States of America is held to be the country of origin of informed consent, the initial aim of which was make sure that the correct dignity of the patient's independence be reserved at the time of decision making and choice of medical options. Reports on this topic, in fact, first appeared in the USA, at the beginning of the 18th Century, with problems focusing on and limited to only the simple rights of the patient in giving his/her approval of the health intervention later to be conceptually developed, along the lines of an itinerary with, at intervals, famous legal actions, until in the 20th Century, informed consent was reached, a criterion that, as is well known, foresees and includes not only the important and fundamental autonomy of the patient to decide, which stems ones personal rights, but also the essential objective element, which is, information. The expression informed consent has simply been transposed in Italian and roughly translated in an ambiguous fashion into "consenso informato" when, on the contrary, it should be referred to as "informazione per il consenso" "information for consensus" not only to respect the concept but, surely, for a more correct deciphering and a more precise interpretation related to the numerous concepts it presupposes and implies. Information and consent may be compared to the two sides of the same coin. These are the two important pillars that coincide and are joined giving weight to the medical responsibility, as far as concerns consent to the health intervention: on the one hand, having obtained consent,following correct and sincere information interpreted and deciphered as an important phase and an essential indicator of correct, scrupulous medico-professional procedure and, on the other, the consensus itself conceived as a duty aiming at the maximum respect of the rights to autodetermination, independence and autonomy of the patient, as a person. At the beginning of the Nineties, as we have seen, we were made aware of a series of legal actions regarding medical responsibility which was greatly conditioned by the Anglosaxon influence which initially induced many Italian magistrates and forensic physicians to adopt an extremely rigid attitude with no attempt to comply, in any way, with the culture and traditions of our country and our tradition which has always been inspired by good common sense, both medical and human. The American experience has been very rapidly adopted, by some, without a profound, complete and necessary historical and evolutional analysis aimed at those intertwined principles that have been motifs that have gradually led to the legal references in those emblematic cases referred to, the conclusions of which continue to attract a great deal of attention. In Italy, the legal and doctrinal evolution of informed consent, even if following a little more rapidly the traces, steps, problems and interpretations of the various aspects drawn up, characterized and applied in the United States, has not only occurred at a later time, but, despite reaching the same meaningful objectives, the same considerations, the same importance, and, unfortunately, the same inconveniences, has had quite different aims, approaches and articulations. In this respect, it is enough to focus attention on the different cultural traditions and religious routes, on the different doctrinal background, the particular historical origins and the individual legal aspects, all extremely different one from the other. (ABSTRACT TRUNCATED)

Christianity↗

Functional effects of lymphotoxin on crushed peripheral nerve.

The effect of lymphotoxin (LT) on the functional recovery of crushed peripheral nerves was studied. Using a specially designed compression device, a 5 mm segment of the right sciatic nerve of rats was subjected to a 100 g crush load with a 2 hr duration. The rats in the experimental and control groups received two doses of LT (20 micrograms/kg each) or the same volume of saline, respectively, administered intraperitoneously 24 hr and 1 hr before the procedure. Walking track tests and histologic examinations were performed at intervals up to 56 days after the crush. Motor functional recovery in the LT pretreated group started at day 7 while the crushed limb in the control group remained totally dysfunctional. The sciatic functional index improved faster in the LT group than in the control group during the second week after the crush and reached a significant difference (P < 0.05) at day 18. Subsequently, both groups had a similar evolution. Histologic results paralleled the functional findings. In conclusion, LT can promote motor functional recovery of crushed rat peripheral nerve in the early stage of regeneration.

Analysis of Variance↗

Origin of evolutionary novelty: examples from limbs.

Classic hypotheses of vertebrate morphology are being informed by new data and new methods. Long nascent issues, such as the origin of tetrapod limbs, are being explored by paleontologists, molecular biologists, and functional anatomists. Progress in this arena will ultimately come down to knowing how macroevolutionary differences between taxa emerge from the genetic and phenotypic variation that arises within populations. The assembly of limbs over developmental and evolutionary time offers examples of the major processes at work in the origin of novelties. Recent comparative developmental analyses demonstrate that many of the mechanisms used to pattern limbs are ancient. One of the major consequences of this phenomenon is parallelism in the evolution of anatomical structures. Studies of both the fossil record and intrapopulational variation of extant populations reveal regularities in the origin of variation. These examples reveal processes acting at the level of populations that directly affect the patterns of diversity observed at higher taxonomic levels.

Animals↗

Clinical relevance of electrophysiological tests in the assessment of patients with Huntington's disease.

Assessment programs recently designed to follow-up patients with Huntington's disease (HD) in therapeutic trials have not included electrophysiological testing in the list of mandatory examinations. This omission is likely due to the current lack of data establishing a clear correlation between the electrophysiological results and those of clinical assessment. We address this issue in a cohort of 36 patients at relatively early stages of the disease (I and II). Electrophysiological studies comprised the recording of palmar sympathetic skin responses (SSRs), blink reflexes (BRs), thenar long latency reflexes (LLRs), cortical somatosensory evoked potentials (SEPs), and electromyographic silent periods evoked by transcranial magnetic stimulation (SPs). Results were analyzed with reference to disease duration and staging and to specific cognitive, psychiatric, and motor alteration. SEPs were the most and very sensitive markers, because they were abnormal in 94% of patients. Except for LLRs, alteration of electrophysiological results increased in parallel to the evolution of the disease. Except for LLRs and SSR latency, electrophysiological results correlated with those of specific clinical examinations. In particular, an increased BR latency or a reduced amplitude of the N20 component of SEPs correlated with the extent of bradykinesia, whereas a reduced amplitude of SSRs or of the N30 component of SEPs correlated with hyperkinesia. Overall, electrophysiological tests, in particular SEPs and BRs, appeared sensitive and interesting in the follow-up of HD patients and correlated with various clinical parameters, suggesting that these easy to perform and noninvasive repeatable examinations could be added fruitfully to the assessment programs for HD.

Adult↗

Vb6 T-cell receptor elements in artiodactyls: conservation and germline polymorphisms.

By use of primers specific for human T-cell receptor (Tcr) Vb6 gene elements, a typing system for Tcr Vb variability in several artiodactyl species has been established. The amplified polymorphic locus is homologous to the human Vb6 gene element. Like the human counterpart, the artiodactyl Vb6 element contains a polymorphic intronic simple (gt)n repeat stretch. Extensive length polymorphism of this simple repeat sequence in some artiodactyls should allow efficient association studies in a multiplex approach, especially including MHC class II genes. On the protein level the Vb regions display little variability in the inter-species comparison among artiodactyls. The amino acid substitutions are not concentrated in the putative complementarity determining regions, suggesting evolutionary conservation. In addition, the simple repetitive element has been preserved in the same genomic location for more than 7 x 10(7) years. Similar evolutionary persistence has already been demonstrated for a (gt)n(ga)m repeat stretch in the second intron of the MHC-DRB locus. The reasons for these parallel developments in evolution are so far not clear, but they may point to a biological meaning if not function of the intronic simple repeat element.

Amino Acid Sequence↗

Hypertension in diabetic nephropathy: prevention and treatment.

Hypertension is the major determinant of morbidity and mortality in diabetic patients. In type I diabetes hypertension develops in parallel with the evolution of nephropathy, whereas in type II diabetes hypertension precedes the onset of manifest diabetes mellitus by years or decades. Nephropathy is equally common in types I and II diabetes. Strong genetic determinants for nephropathy have been recognized, but it is unclear whether a genetic predisposition to hypertension and elevated sodium-lithium countertransport are involved. In epidemiologic studies hypertension is related to the risk and rate of evolution of diabetic nephropathy, retinopathy, and cardiovascular complications. The relationship appears to be causal, because antihypertensive treatment attenuates the rate of loss of glomerular filtration. In this respect angiotensin-converting enzyme inhibitors appear to be superior (renal protective action). Calcium channel blockers have been promising in experimental studies, but clinical information is currently incomplete.

Antihypertensive Agents↗

Have deoxyribonucleotides and DNA been among the earliest biomolecules?

Unlike ribose chemistry, the chemistry of 2-deoxyribose precludes its formation or at least its incorporation into nucleotides under accepted "primordial soup" conditions; therefore RNA and DNA could not develop in parallel during the evolution of protocells. However, deoxyribonucleotides might have been formed abiotically by direct reduction of ribonucleotides in a primitive version of the biochemical pathway. This sequence of events, in which DNA lagged behind RNA in the assembly of genetic information for an unknown--probably short--period of time is suggested by the primitive traits (i.e., nucleotide binding, thiol redox chemistry, and metal ion catalysis) of present-day enzyme systems of deoxyribonucleotide biosynthesis. The reaction should be amenable to experimental study.

Carbohydrates↗

Pulmonary toxicity in mice after high-dose methotrexate administration with and without leucovorin rescue.

Interstitial lung lesions were induced in mice by high-dose methotrexate with high frequency. They appeared early after treatment; their onset, evolution and recovery parallelled those of lesions to the hemopoietic tissues and the intestine. The pathogenesis of methotrexate lung toxicity in mice is discussed. Leucovorin rescue was ineffective in preventing the lung lesions induced by high-dose methotrexate.

Animals↗

Microscopic-macroscopic interface in biological information processing.

Recent experimental work suggests that chemical messengers associated with the neuron membrane serve as a link between macroscopic and microscopic information processes in the brain. Arguments based on the physical limits of computing, on computational parallelism, and on evolution theory suggest that microphysical computing processes enormously enhance the brain's computing power. A number of models are briefly sketched which illustrate how molecular switching processes could be recruited for useful biological functions. The flow of information between microscopic and macroscopic forms is suggestive of processes which occur in a measuring apparatus, and the implications of this analogy are considered.

Animals↗

DNA homologies between the rainbow trout, chum salmon and coho salmon.

The thermal stabilities of hybrid duplexes between the DNAs from three salmonid fish species were monitored as measures of DNA homology. The chum salmon, Oncorhynchus keta, and coho salmon, Oncorhynchus kisutch, had more DNA homology with each other than either had with the rainbow trout, Salmo gairdnerii. Morphological, ecological and protein similarities between the coho salmon and the rainbow trout may be due to parallel or convergent evolution.

Animals↗

Is plasma 5 alpha-androstane 3 alpha, 17 beta-diol glucuronide a biochemical marker of hirsutism in women?

We investigated whether plasma androstanediol glucuronide (ADG) levels reflect the increased androgenicity in women with idiopathic hirsutism (n = 24) or hirsutism associated with polycystic ovary syndrome (n = 10). We also evaluated whether ADG levels parallel the clinical evolution of the hirsutism during a combined treatment, with cyproteroneacetate (2 mg) and ethinylestradiol (35 micrograms), of women with moderate idiopathic hirsutism. Finally, we investigated if there is evidence for increased conversion of precursors to ADG in hirsutism, by comparing the ADG levels, measured by RIA, to ADG levels obtained by applying the conversion rates of precursors obtained in non-hirsute women. ADG levels were increased in less than half of the patients with mild hirsutism. The clinical cure of hirsutism, which was obtained by the treatment in majority of patients, was accompanied by a significant decrease of plasma ADG levels, but a similar decrease was also observed in the 5 patients who did not respond to treatment. The data show that, although there is evidence for increased conversion of precursors to plasma ADG in mildly hirsute women, the latter is not a reliable parameter of androgenicity. Our data suggest, moreover, that treatment with cyproterone acetate and ethinylestradiol decreases 5 alpha-reductase activity, as indicated by the more important decrease in ADG levels than in the precursors.

Adult↗

A role for the cerebellum in motor speech planning: evidence from foreign accent syndrome.

A 3 year follow-up study was performed in a patient with foreign accent syndrome (FAS) as the sole cognitive manifestation of a left fronto-parietal stroke. The hypothesis of involvement of the right cerebellum in this motor speech planning disorder was investigated by means of functional neuroimaging (SPECT) and neurobehavioral assessments. Based on the close parallelism between the evolution of FAS symptoms and the perfusional changes in the right cerebellum, it is argued that FAS may result from a disruption of a close functional interplay between the supra- and infratentorial speech centers involved in motor speech planning.

Cerebellum↗

Divergent evolutionary lines of fungal cytochrome c peroxidases belonging to the superfamily of bacterial, fungal and plant heme peroxidases.

Novel open reading frames coding for cytochrome c peroxidase (CcP) belonging to the superfamily of bacterial, fungal, and plant heme peroxidases were analyzed in the available fungal genomes. Multiple sequence alignment of 71 selected peroxidase genes revealed the presence of three conserved regions essential for their function: one on the distal and two on the proximal side of the prosthetic heme group. Conserved sequence motifs on the proximal heme side are peculiar for CcPs and are responsible for their reactivity. Phylogenetic analysis performed with the distance method as well as with the maximum likelihood method revealed the existence of three distinct subfamilies of fungal CcP and their relationship to other members of the peroxidase superfamily. These divergent CcP evolutionary lines apparently evolved from a single primordial heme peroxidase gene in parallel with the evolution of ascorbate peroxidase genes. Analyzed CcPs differ significantly in their N-terminal sequences. Only subfamily I did not exhibit a presence of any signal sequence. Subfamily II members possess a well defined signal sequence allowing processing and release into mitochondrion and also in subfamily III a signal sequence was detected. Several here analyzed peroxidase genes mainly from Candida albicans and from Rhizopus oryzae can be considered interesting for the investigation of the structure-function relationship of novel CcPs revealing differences to the well documented properties of cytochrome c peroxidase from Saccharomyces cerevisiae.

Amino Acid Motifs↗

A breakthrough in neuroscience needs a "Nebulous Cartesian System" Oscillations, quantum dynamics and chaos in the brain and vegetative system.

The Cartesian System is a fundamental conceptual and analytical framework related and interwoven with the concept and applications of Newtonian Dynamics. In order to analyze quantum processes physicist moved to a Probabilistic Cartesian System in which the causality principle became a probabilistic one. This means the trajectories of particles (obeying quantum rules) can be described only with the concept of cloudy wave packets. The approach to the brain-body-mind problem requires more than the prerequisite of modern physics and quantum dynamics. In the analysis of the brain-body-mind construct we have to include uncertain causalities and consequently multiple uncertain causalities. These multiple causalities originate from (1) nonlinear properties of the vegetative system (e.g. irregularities in biochemical transmitters, cardiac output, turbulences in the vascular system, respiratory apnea, nonlinear oscillatory interactions in peristalsis); (2) nonlinear behavior of the neuronal electricity (e.g. chaotic behavior measured by EEG), (3) genetic modulations, and (4) additional to these physiological entities nonlinear properties of physical processes in the body. The brain shows deterministic chaos with a correlation dimension of approx. D(2)=6, the smooth muscles approx. D(2)=3. According to these facts we propose a hyper-probabilistic approach or a hyper-probabilistic Cartesian System to describe and analyze the processes in the brain-body-mind system. If we add aspects as our sentiments, emotions and creativity to this construct, better said to this already hyper-probabilistic construct, this "New Cartesian System" is more than hyper-probabilistic, it is a nebulous system, we can predict the future only in a nebulous way; however, despite this chain of reasoning we can still provide predictions on brain-body-mind incorporations. We tentatively assume that the processes or mechanisms of the brain-body-mind system can be analyzed and predicted similar to the metaphor of "finding the walking path in a cloudy or foggy day". This is meant by stating "The Nebulous Cartesian System" (NCS). Descartes, at his time undertaking his genius step, did not possess the knowledge of today's physiology and modern physics; we think that the time has come to consider such a New Cartesian System. To deal with this, we propose the utilization of the Heisenberg S-Matrix and a modified version of the Feynman Diagrams which we call "Brain Feynman Diagrams". Another metaphor to consider within the oscillatory approach of the NCS is the "string theory". We also emphasize that fundamental steps should be undertaken in order to create the own dynamical framework of the brain-body-mind incorporation; suggestions or metaphors from physics and mathematics are useful; however, the grammar of the brains intrinsic language must be understood with the help of a new biologically founded, adaptive-probabilistic Cartesian system. This new Cartesian System will undergo mutations and transcend to the philosophy of Henri Bergson in parallel to the Evolution theory of Charles Darwin to open gateways for approaching the brain-body-mind problem.

Brain↗

[Follicular keratosis and multiple myeloma].

Follicular keratosis may be a rare paraneoplastic disease having unknown etiopathogeny that is sometimes associated to myeloma whose diagnosis and evolution follow a parallel course. We describe the case of a 57-year-old female patient diagnosed of multiple myeloma 8 years ago. She developed generalized follicular hyperkeratotic spicules coinciding with leukemization of the myeloma.

Antineoplastic Agents↗