Иринотекан в лечении колоректального рака. Обзор литературы

In 1998, oncologists got a brand new antitumor drug – irinotecan. It’s been already 18 years since its approval for second-line polychemotherapy of metastatic colorectal cancer. Indications for irinotecan use were significantly expanded since that time; it is now used in combination with other therapeutic agents for first- or second-line treatment of metastatic colorectal cancer, in combination with targeted drugs or separately; there are some studies assessing the use of irinotecan in neoadjuvant therapy. The article describes the history and modern schemes of irinotecan administration in treatment of colorectal cancer.С 1998 г. в арсенале онкологов появился принципиально новый противоопухолевый агент – иринотекан. С момента его одобрения в качестве препарата для проведения 2-й линии полихимиотерапии метастатического колоректального рака прошло уже 18 лет. За это время к применению иринотекана появилось большое количество показаний, его используют в различных сочетаниях с другими препаратами в качестве 1-й и 2-й линий терапии метастатического колоректального рака, в сочетании с таргетными препаратами и без, ведется ряд исследований по изучению работы препарата в неоадъювантном режиме. В статье рассматриваются история и современные схемы применения иринотекана в лечении колоректального рака

Description of the two-nucleon system on the basis of the Bargmann representation of the S matrix

For the effective-range function $k\cot \delta$, a pole approximation that involves a small number of parameters is derived on the basis of the Bargmann representation of the $S$ matrix. The parameters of this representation, which have a clear physical meaning, are related to the parameters of the Bargmann $S$ matrix by simple equations. By using a polynomial least-squares fit to the function $k\cot \delta$ at low energies, the triplet low-energy parameters of neutron-proton scattering are obtained for the latest experimental data of Arndt et al. on phase shifts. The results are $a_{t}=5.4030$fm, $r_{t}=1.7494$fm, and $v_{2}=0.163$fm$^{3}$. With allowance for the values found for the low-energy scattering parameters and for the pole parameter, the pole approximation of the function $k\cot \delta$ provides an excellent description of the triplet phase shift for neutron-proton scattering over a wide energy range ($T_{\text{lab}}\lesssim 1000$MeV), substantially improving the description at low energies as well. For the experimental phase shifts of Arndt et al., the triplet shape parameters $v_{n}$ of the effective-range expansion are obtained by using the pole approximation. The description of the phase shift by means of the effective-range expansion featuring values found for the low-energy scattering parameters proves to be fairly accurate over a broad energy region extending to energy values approximately equal to the energy at which this phase shift changes sign, this being indicative of a high accuracy and a considerable value of the effective-range expansion in describing experimental data on nucleon-nucleon scattering. The properties of the deuteron that were calculated by using various approximations of the effective-range function comply well with their experimental values.Comment: 39 pages, 3 figure