"Inhlamvu yomlingo" yokulwa nomdlavuza: Ake sifunde nje ngama-Antibody-Drug Conjugates (ama-ADC)!

Uma ucabanga ngokwelashwa komdlavuza, i-chemotherapy ifika engqondweni ngokushesha, akunjalo? Siyazi njengokwelashwa okuhamba kuwo wonke umzimba, kuthinta amangqamuzana omdlavuza kanye namaseli anempilo, futhi kunemiphumela emibi ethile emibi. Kodwa ake sithi kukhona indlela yokuthola indawo eqondile yeseli lomdlavuza, ukulinika umuthi, nokubhubhisa umdlavuza ngaphandle kokulimaza amangqamuzana anempilo aseduze. Yilokho esizokhuluma ngakho namuhla. Lokhu kubizwa ngokuthi ama-Antibody-Drug Conjugates, noma ama-ADC ngamafuphi.

Kalula nje, iyini le Antibody-Drug Conjugate (ADC)?

I-ADC ubuchwepheshe obusha nobuthembisayo kakhulu emhlabeni wokwelashwa komdlavuza. Kulokhu, sisebenzisa inhlanganisela yezindlela ezimbili zokwelapha eziyinhloko: Ukwelashwa Okuqondiwe kanye Nokwelashwa Ngemithi.

Cabanga ngakho 'njengesikhali esiqondiswayo' . Isikhali singathola umgomo waso bese siwushaya kuphela. Ngokufanayo, ukwelashwa kwe-ADC kukhetha futhi kubhubhise amangqamuzana omdlavuza phakathi kwezigidigidi zamaseli emzimbeni. Okwenzekayo kulokhu ukuthi umuthi we-chemotherapy onamandla kakhulu uyiswa ngokuphephile esitokisini somdlavuza bese ufakwa kuwo kuphela. Lokhu kusho ukuthi umphumela womuthi we-chemotherapy kumaseli anempilo mncane kakhulu.

Odokotela be-oncologists bavame ukusebenzisa lolu hlobo lokwelashwa lwe-ADC ukuze:

• Uma umdlavuza uphinde ubuye .
• Uma ezinye izindlela zokwelapha zingaphumeleli (umdlavuza obangela ukungezwani komzimba) .
• Uma umdlavuza usakazekela kwezinye izingxenye zomzimba (ukusabalala kwamaseli) .

Ukwelashwa kwe-ADC kungase kungayiqedi ngokuphelele i-cancer, kodwa ucwaningo lukhombisile ukuthi iziguli ezithola lokhu kwelashwa zinethuba elide lokusinda .

Kulungile, pho-ke isebenza kanjani le 'magic bullet' ebizwa ngokuthi i-ADC?

Lokhu kungase kubonakale kuyinkimbinkimbi ukukuqonda, kodwa ake sikuqonde ngesibonelo esilula. Ake sithi iphasela eli-odwe ku-inthanethi lilethwa ekhaya lakho.

Le phakheji ye-ADC inezingxenye ezintathu eziyinhloko:

1. I-Monoclonal Antibody: Lena yindlela yethu yokulethwa. Lena iphrotheni ekhethekile eyenziwa elabhorethri. Inekhono elimangalisayo lokubona uphawu oluthile ebusweni bamangqamuzana omdlavuza (siwabiza ngokuthi ama-Tumor Antigens ). Njengoba nje ukhiye ungena enkingeni, le antibody iya kulolo phawu olusengqamuzaneni lomdlavuza bese inamathela kulo. Ayinamatheli kwamanye amangqamuzana anempilo.

2. Umuthi othize we-chemotherapy:Leli yiphakethe elilethwayo. Lezi imithi enamandla kakhulu kune-chemotherapy ejwayelekile. Kodwa uma lo muthi uthunyelwa emzimbeni wodwa, ungabangela umonakalo omkhulu kumaseli anempilo. Yingakho siwuthumela ku-ejenti yokulethwa.

3. Iphrotheni ethi "Linker": Lena yingxenye efana 'ne-gum' exhumanisa into yokulethwa kanye nephasela ndawonye. Inemisebenzi emibili. Eyokuqala ukubamba iphasela (umuthi we-chemotherapy) ngokuqinile kuze kube yilapho into yokulethwa (i-antibody) ithola iseli lomdlavuza. Into yesibili nebaluleke kakhulu ukukhulula iphasela bese ulithumela ngaphakathi kweseli lomdlavuza uma lifika endaweni efanele.

Ngakho-ke nansi indlela lezi zintathu ezisebenza ngayo ndawonye:

• Uma umuthi we-ADC ufakwa emzimbeni, i-ejenti yokulethwa (i-antibody) ihamba kuwo wonke umzimba futhi ifune amangqamuzana omdlavuza.
• Uma kutholakala iseli lomdlavuza, liya phezulu bese linamathela kulo.
• Bese kuthi iseli lomdlavuza lidonsele le ADC ngaphakathi.
• Uma selingaphakathi kweseli, leso sixhumi siyaphuka, bese iphakethe (umuthi we-chemo) liyakhishwa.
• Lo muthi onamandla ubhubhisa amangqamuzana omdlavuza angaphakathi kuwo.

Yiziphi izinhlobo zomdlavuza eziphathwa nge-ADC?

Okwamanje, ukwelashwa kwe-ADC akusetshenziselwa zonke izinhlobo zomdlavuza. Kodwa-ke, lokhu kwelashwa kuvunyelwe ezinhlotsheni eziningana zomdlavuza. Lolu hlu cishe luzokhula esikhathini esizayo.

Imithi eminingana ye-ADC esetshenziswayo njengamanje

Okwamanje kunemithi ye-ADC engaphezu kweshumi nambili evunyelwe yi-US FDA. Ezinye izibonelo yilezi:

• I-Brentuximab vedotin (Adcetris®): Enye ye-ADC zokuqala ukuthola imvume ye-FDA. Isetshenziselwa ukwelapha umdlavuza wegazi njenge-Hodgkin lymphoma kanye ne-anaplastic large cell lymphoma.
• I-Trastuzumab emtansine (Kadcyla®): Isetshenziselwa ukwelapha umdlavuza webele one-HER2-positive osakazeke emzimbeni wonke.
• I-Sacituzumab govitecan (Trodelvy®): Ukwelashwa komdlavuza webele ongasebenzi kahle, othuthukisiwe onemiphumela emithathu emibi. Iphinde isetshenziswe kumdlavuza womgudu womchamo othuthukisiwe.

Abacwaningi okwamanje baphenya ukuthi le mithi ingasetshenziswa yini kwezinye izinhlobo zomdlavuza kanye nezifo ezingezona ezomdlavuza. Kuqhutshwa izivivinyo zemitholampilo ezingaphezu kwe-100 emhlabeni jikelele.

Yiziphi izinzuzo eziyinhloko zokwelashwa kwe-ADC?

Inzuzo enkulu nebaluleke kakhulu yalokhu kwelashwa ukuthi kungaletha imithi ye-chemotherapy ngqo kumaseli omdlavuza ngaphandle kokulimaza amaseli anempilo. Lokhu kuvumela odokotela ukuthi basebenzise imithi ye-chemotherapy enamandla kakhulu ngaphandle kokwesaba ukulimaza amaseli anempilo.

Ku-chemotherapy yendabuko, umuthi ulethwa ngemithambo yegazi emzimbeni wonke. Lokhu kubizwa ngokuthi i-systemic chemotherapy. Uma umuthi uhamba emzimbeni wonke ngale ndlela, awugcini nje ngokulimaza amangqamuzana omdlavuza ahlukana ngokushesha, kodwa futhi ulimaza amangqamuzana anempilo afana namangqamuzana ethu ezinwele, amangqamuzana aphulukisa amanxeba emilonyeni yethu, kanye namangqamuzana enza igazi. Lesi yisona sizathu esiyinhloko semiphumela emibi eyengeziwe.

Kodwa le nkinga ayivamile kakhulu ekwelashweni kwe-ADC. Yingakho abanye odokotela bezifo zomdlavuza besebenzisa ngisho namagama anjengokuthi “i-magic bullet” kanye “nokwelashwa okunembile” kulokhu kwelashwa.

Njengakho konke okunye, ingabe kukhona imiphumela emibi kulokhu?

Yebo. Ukwelashwa kwe-ADC kungabangela imiphumela emibi. Kodwa lokhu kuvame ukuba mincane kuneye-chemotherapy yendabuko. Imiphumela emibi eyenzeka ingahluka kuye ngesiguli. Lokhu kuncike ezicini ezifana nohlobo lomdlavuza onalo, isigaba somdlavuza, kanye nempilo yakho iyonke.

Uma uthola ukwelashwa kwe-ADC, ithimba lakho lezokwelapha lizokuqapha ngokucophelela. Uma kuvela noma yimiphi imiphumela emibi, bazosebenza ukuze bayelaphe ngokushesha.

Ukwelashwa kwe-ADC kuphumelele kangakanani?

Ngokuvamile, ucwaningo lubonisa ukuthi iziguli ezithola ukwelashwa kwe-ADC ziphila isikhathi eside kuneziguli ezithola ukwelashwa ngamakhemikhali okuvamile kohlobo olufanayo lomdlavuza. Kodwa-ke, imiphumela ingahluka kumuntu nomuntu. Kunezici eziningana ezingathinta lokhu:

• Uhlobo lomdlavuza: Ukwelashwa kwe-ADC kusebenza kahle kakhulu kwezinye izinhlobo zomdlavuza. Kungase kungasebenzi kahle kwezinye.
• Isigaba somdlavuza: Ukwelapha umdlavuza osakazeke emzimbeni wonke kuhlale kuyinselele.
• Impilo yakho iyonke: Lokhu kwelashwa kungabangela imiphumela emibi kakhulu, ngakho-ke umzimba wakho udinga ukukwazi ukukubekezelela. Udokotela wakho womdlavuza uzokuchazela lokhu kahle ngaphambi kokukunikeza lokhu kwelashwa.

Igama elithi "ithemba" liyigugu kakhulu kumuntu olwa nomdlavuza. Ukwelashwa kwe-ADC kuyithemba elisha kakhulu. Lokhu kwelashwa kungasiza iziguli ezihlulekile kwezinye izindlela zokwelapha futhi ezinomdlavuza ophinde wabuya ukuba ziphile isikhathi eside futhi zibe nempilo engcono.