跟读练习: PARP Inhibitors: 2023 Updates - 通过视频学习英语口语

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Thank you for joining us for this session on PARP inhibitors.

PARP inhibitors have been one of the most exciting advancements in the treatment of ovarian cancer in years,

but recently have come under increasing scrutiny from the Food and Drug Administration.

Dr. Ginny Fleming from the University of Chicago will update us on the latest.

Dr. Fleming is Professor of Medicine and Director of the Medical Gynecologic Oncology program at the University of Chicago,

and we're thrilled to have her join us for this session.

Hello, it's a pleasure to be here with you to discuss

some of the changing indications for PARP inhibitors in the treatment of ovarian cancer.

Here are the topics I'm going to try to cover.

First, what is HRD?

Second, in brief, how do PARP inhibitors work?

Third, which ones are currently FDA -approved and for what ovarian cancer indications?

And finally, what has been a whirlwind of changes,

what are the recent changes in the FDA -approved settings for PARP inhibitor use for women with ovarian cancer?

And what has motivated these changes.

First, homologous DNA repair, sometimes abbreviated HR for homologous repair.

DNA is what carries the messages for all the proteins and enzymes in our body.

It's the mat for everything.

DNA is usually wound together in double strands, and there can occur from many various reasons,

ultraviolet light, many other things, breaks in the DNA.

And these are primarily repaired by what we call the homologous recombination repair pathway, the HR repair pathway.

The BRCA gene is involved in homologous repair.

A mutated BRCA gene does not do its job, So cells with BRCA deficiency lack HR repair,

and they're referred to as HR deficient or HRD.

Ovarian cancers may also harbor many other alterations which lead to deficiency in the HR pathway,

and these tumors are also referred to as HRD.

About half of ovarian cancers are HRD, including those with germline or tumor BRCA alterations.

Homologous recombination deficiency leads to increased sensitivity of cancers to both platinum therapy and PARP inhibitor therapy.

Tests for HRD are generally done on the tumor, and there's a variety of approved companies that do these tests

and you are probably familiar with their use as physicians consider whether

or not PARP inhibitor maintenance should be used in a particular situation.

So PARP inhibitors, as you can see here, are also involved in the repair of DNA breaks.

That's a double -strand DNA diagram there and the PARP inhibitors help repair a single -strand break.

Single -strand breaks occur all the time, and PARP helps detect and repair them.

However, during the replication process, they convert single -strand breaks into double -strand breaks.

Normal cells then repair these by homologous recombination, but cells that are HRD do not have an effective repair pathway, and this leads to cell death.

So these are the cells, the HR -deficient cells, that are particularly sensitive to PARP inhibitors.

PARP inhibitors can clearly shrink ovarian cancer.

What is not so clear is in what situations they are better than other options

when they are used in trials of treatment.

The very first, I'm going to give some examples here of use in what we're calling treatment,

which is when it's used in the setting of measurable disease, usually not just as maintenance after chemotherapy.

So Rocaprib, one of the three PARP inhibitors approved for ovarian cancer,

was initially approved based on two actually quite small studies for

the total of 106 patients with high -grade ovarian cancer whose disease had progressed after two or more prior therapies.

All the women in this study had either a germline mutation or their tumor had a somatic mutation.

So a germline mutation is when the mutation is inherited and can be passed on to your children.

And it's found in all the cells of your body, blood cells, cells from a cheap swab.

But ovarian cancers can also have what we call somatic mutations.

And those are mutations that are only in the tumor and not passed on from, you know, parent to child.

Either one of these confers sensitivity to platinum or PARP inhibitor therapy.

The primary endpoint of the study, meaning how was the study designed, what was it designed to find, was response rates or rate of tumor shrinkage.

And in these two studies, the rate of tumor shrinkage was over 50%,

and these shrinkages lasted for a median or an average of 9 .2 months.

So that's if it shrank, how long did it stay shrink?

similarly another one of the PARP inhibitors used for ovarian cancer

olaparib was in an early study tested again in women all of whom had a germline BRCA1

or 2 mutation and who had more than three lines of prior chemotherapy

and was found to have a response rate of 34 percent where these responses lasted an average of eight months.

However, notice below

that you can see on this table divides the tumors treated

on this admittedly small group of patients into tumors in the situation that were expected to be platinum sensitive,

generally more than six months from prior platinum therapy and shrank with the prior platinum therapy, platinum resistant, so recurrence less than six months,

and platinum refractory progressed on platinum.

And you can see that the rate of tumor shrinkage was clearly highest in tumors that were platinum -sensitive,

and only two patients responded who had platinum refractory disease.

So clearly there is, as we say, non -cross -resistance between platinum and a PARP inhibitor.

Tumors that are resistant to platinum are much more likely to be resistant to PARP inhibitors as well.

And this will become important when we discuss why there have been some changes in indications for PARP inhibitors.

That is to say, they are no longer indicated.

The FDA no longer approves them for use as so -called treatment.

All the current approvals are only as maintenance.

So one very early trial, again, many years ago, one of the first PARP inhibitor trials, they compared PARP to liposomal doxorubicin in women,

all of whom had a germline BRCA mutation and had recurrence within 12 months of prior platinum therapy.

These women were only about 100 in total,

and they were randomized to one of two different doses of Olaprib versus liposomal doxorubicin,

and patients were permitted to cross over at the time of progression.

So a woman who was on doxyl could cross over at the time of progression to a PARP inhibitor and vice versa.

And here you see the schema of the trial, low -dose olaparib, higher -dose olaparib, and liposomal doxorubicin.

And here are the response rates and the progression -free survival.

So the progression -free survival was slightly higher in the high -dose olaparib than it was in liposomal doxorubicin,

but these results, all of them, were no different than what was expected to be with chance.

So here was an early trial that began to raise questions about, although PARP inhibitors clearly have activity, are they better than something else?

And a lot of the trials

that were used to try to gain FDA approval were trying to show

that PARP inhibitors were better than something else in some way.

So again, the terminology I'm using, when I say we're using it as treatment,

it's used to treat a cancer that would generally have progressed or recurred after some other therapy, although you could use it for first -line treatment.

But none of the PARP inhibitors are approved as first -line treatment.

Whereas maintenance, the drug is used to treat a cancer after chemotherapy has already decreased the size of the tumor

or made it disappear entirely.

And the idea is to maintain that response, hence maintenance therapy. So back in 2014,

Olaparib was approved by the FDA for use as treatment in patients who had BRCA -mutated ovarian cancer

and at least three or more rounds of prior treatment.

However, and by 2018, Rucaparib and Naraparib were also approved, and in 2022, the FDA began issuing withdrawals.

Currently, there are no more treatment approvals.

The approvals are for olaparib for maintenance,

niraparib as maintenance, and rucaparib as maintenance.

And the exact indications, whether for BRCA or for any platinum -sensitive disease, have varied by drug.

100

probably more due to details of trial design than because the different PARP inhibitors are so different.

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However, we are expecting a withdrawal, the first withdrawal of maintenance of Rucaparib,

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or may have already happened for platinum -sensitive disease.

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What has been withdrawn, which indications are no longer FDA approved?

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All the treatment indications.

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So all the uses of PARP inhibitors other than as maintenance have been withdrawn by the companies in response to FDA communications.

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And niraparib has been withdrawn for maintenance in platinum -sensitive recurrent disease for women and tumors that don't have BRCA mutations. So what happened?

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Why would they approve all these things and then change it?

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In general, of PARP inhibitors were initially approved based on information regarding progression -free survival,

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how long the treatment could continue before the cancer grows, or response rate,

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where response rate is generally in trials defined as percentage of subjects whose tumors shrink by 30 % or more.

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But later data began suggesting that overall survival was not as positively affected as progression -free survival.

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And in some trials, it appeared that the subjects getting PARP inhibitor therapy might even have decreased survival compared to controls.

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In many, it wasn't statistically significant, but it was alarming.

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There are a lot of arguments, as you can imagine, that have been flying about the validity of these different endpoints

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that are used to try to justify FDA approval.

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Again, the withdrawals are based on new overall survival information, which as you can imagine takes a lot longer to come by than tumor shrinkage.

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Tumor shrinkage is the first thing that you get out of a clinical trial.

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The time till the cancer grows takes longer and overall survival takes longer yet.

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So it's years before we have an adequate data set to really assess overall survival.

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Many of the trials were designed for progression -free survival, not overall survival.

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So their size and design may not have been adequate for an accurate assessment of overall survival.

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Crossover, as we discussed, is people who were, for example, randomized to placebo,

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but then after progression, maybe broke the blind and then took a PARP inhibitor.

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That's referred to as crossover.

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And that might affect overall survival.

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However, the hypothesis of people who are concerned about the decreased overall survival

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that is numerically shown in some studies is since tumors that are resistant to PARP inhibitors are more resistant to platinum,

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then taking PARP inhibitors may make subsequent treatment work less well.

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As we showed, people with tumors who's resistant to carboplatin will not have as good a response to PARP inhibitors.

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The converse is also true.

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And again, to review the terminology, progression -free survival in a clinical trial is the time from

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when drug therapy is started until the tumor grows or death of disease, if that happens first.

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Overall survival, obviously, is the time from when drug therapy is started on the study until death of the patient from any cause.

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I'm going to review for you one representative example.

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There are too many to go over, but what a specific example of concern that is caused for a withdrawal of indication.

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And I think that you'll find that if you look at all of them in detail, it's similar.

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So the representative example I'm going to use is the trial is called the NOVA trial.

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It was for niraparib, and it's in the setting of recurrent platinum -sensitive maintenance.

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So this is the design of the NOVA trial.

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Women who were on the trial had platinum -sensitive ovarian cancer.

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with at least two prior platinum treatments.

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So typically, they got platinum, maybe the cancer came back a year or two later, they got platinum again, and the tumor shrank.

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And then at that point, they were randomized to either noreparib or to placebo.

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So this was planned to be almost 500 patients participating,

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and all of them had to have high -grade serous tumors.

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And they had to be in complete or partial response to their most recent platinum therapy.

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And then they were randomized to one of these two regimens, placebo or noreparib, to try to maintain that response, hence the term maintenance therapy.

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So initial publication was in the New England Journal in 2016.

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And you can see that if we look at the group of women who had noreparib maintenance compared to those with placebo.

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they did better in all categories.

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Those that got the most benefit were those that had a germline BRCA mutation.

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And here you can see the time to progression was hugely improved, 21 months versus five months.

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In women who are not germline BRCA mutated, the progression was also improved, although it was shorter overall, nine months versus about four months,

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and so on and so forth for each of the subgroups.

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Again, benefits seen in all subgroups and most dramatic for the germline BRCA mutated.

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But when the later results then more recently came out, presented at 2023, again, overall survival takes years until we have the results,

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you can see that there was not any real difference, even in the patients with the germline BRCA mutation,

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that is 40 months, That's 40 .9 versus 38 .1, which, you know, is a little bit better.

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But when these confidence intervals, that's what we call the numbers in the brackets here, 0 .61 to 1 .2.

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When one is included in that, it's generally considered that it could have happened by chance.

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And then numerically, in the patients who did not have a germline BRC mutation,

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there was numerically worse survival in those who got niraparib, 31 months versus almost 35 in placebo.

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Again, you can see that one is included in the confidence interval.

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So none of these differences here are statistically significant.

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They're all could be the same, and the differences seen between the two groups could be chance.

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But again, there was concern that no survival benefit was seen.

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And even if patients did cross over and take olaparib subsequently, it's hard to understand how that would make them have a shorter survival.

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So the indication, again, for niraparib in the non -germline BRCA mutation was withdrawn as maintenance in the second -line setting.

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Now, in the frontline setting, we don't have overall survival in most of the trials yet.

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The one we do have is the SOLO1 frontline maintenance BRCA mutation carriers.

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And here, there still seems to be an overall survival benefit,

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although for technical reasons, it wasn't quite statistically significant in frontline.

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And I think at this point, the frontline indications are still in place.

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And this is probably where patients are going to get the most benefit.

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And there's also appears to be the lowest risk of secondary myelodysplastic syndrome or leukemia, which is a concern.

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So in conclusion, newer long -term trial results with overall survival continue to gradually come available.

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There is clear benefit for BRCA mutation cares when PARP inhibitors are used in frontline maintenance, and I think focusing on frontline use,

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where the benefit at this point still appears to be very strong is important.

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Thank you.

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本课的词汇与口语要点

这节口语课以视频“PARP Inhibitors: 2023 Updates”为素材。视频中反复出现的词有：Parp, inhibitor, platinum, survival, tumor。这段视频共有 179 个句子、2557 个单词可供跟读。讲话部分时长为 18:18。说话人语速平稳，每分钟约 140 个词，很适合跟读。只有 78% 的单词属于英语最常用的 3,000 词，词汇难度较高。

视频中的重点词汇

视频中 15 个值得学习的单词，附发音和释义：

单词	发音	释义
survival 名词	/sɚˈvaɪ.vəl/	生存
platinum 名词	/ˈplæt.ɪn.əm/	白金, 鉑 /铂
tumor 名词	/tuː.məɹ/	腫瘤 /肿瘤, 瘤子
mutation 名词	/mjuˈteɪʃən/	突變 /突变, 變種 /变种
repair 动词	/ˈɹiːpɛɚ/	修理
approve 动词	/əˈpɹuːv/	批准, 贊成 /赞成
progression 名词	/pɹəˈɡɹɛʃən/	数列
indication 名词	/ɪndɪˈkeɪʃən/	指示
sensitive 形容词	/ˈsɛn.sɪt.ɪv/	敏感
strand 名词	/ˈstɹænd/	綹 /绺, 一綹頭髮 /一绺头发
versus	/ˈvɝsəs/	對 /对
withdrawal 名词	/wɪðˈdɹɔ(ə)l/	退出, 撤退
dose 名词	/ˈdəʊ̯s/	劑量 /剂量, (一)劑 /剂
withdraw 动词	/wɪðˈdɹɔ/	撤退
refer 动词	/ɹɪˈfɜː/	談到 /谈到

视频中出现的短语动词

单词	发音	释义
come back 动词		回來 /回来, 返回
come out 动词	/ˌkʌm ˈaʊt/	出, 出來 /出来
come under 动词		在……之下

视频中的语法

说话人最常用的结构，并附上视频中的原话：

结构	视频中的用法
现在完成时 have/has + 过去分词 — 过去发生但与现在仍有关联的事	have been · have come · has been
被动语态 be + 过去分词 — 强调发生了什么，而不是谁做的	is usually wound · are primarily repaired · is involved
定语从句 who / which + 从句 — 补充说明人或事物	woman who was · people who were · people who are

需要注意的发音

说话人用了 15 次缩略和弱读形式，例如 I'm, we're, don't。请按听到的简短形式来说。

“th” 音: withdrawal /wɪðˈdɹɔ(ə)l/, withdraw /wɪðˈdɹɔ/, pathway /ˈpæθˌweɪ/, chemotherapy /ˌkiːməʊˈθɛɹəpi/, hypothesis /haɪˈpɒθɪsɪs/
“sh” 和 “zh” 音: mutation /mjuˈteɪʃən/, progression /pɹəˈɡɹɛʃən/, indication /ɪndɪˈkeɪʃən/, deficiency /dɪˈfɪʃənsi/, publication /ˌpʌblɪˈkeɪʃ(ə)n/
长单词——注意重音位置: indication /ɪndɪˈkeɪʃən/, statistically /stəˈtɪs.tɪ.kə.li/, deficiency /dɪˈfɪʃənsi/, chemotherapy /ˌkiːməʊˈθɛɹəpi/, sensitivity /ˌsɛn.səˈtɪv.ə.ti/

中文母语者容易读错的音：

/v/ — 不要读成 /w/，上齿轻触下唇: survival /sɚˈvaɪ.vəl/, approve /əˈpɹuːv/, sensitive /ˈsɛn.sɪt.ɪv/, versus /ˈvɝsəs/, sensitivity /ˌsɛn.səˈtɪv.ə.ti/
词尾辅音 — 要读清楚，后面不要加元音: approve /əˈpɹuːv/, sensitive /ˈsɛn.sɪt.ɪv/, resistant /ɹəˈzɪstənt/, strand /ˈstɹænd/, versus /ˈvɝsəs/
/r/ 和 /l/ 的区别: withdrawal /wɪðˈdɹɔ(ə)l/, primarily /ˈpɹaɪ.mə.ɹə.li/, alarm /əˈlɑɹm/, gradually /ˈɡɹæd͡ʒuəli/, partial /ˈpɑɹʃəl/

如何用这段视频练习

先完整听一遍视频，不要开口，记下不认识的单词。
用正常速度逐句跟读，每句重复到你的节奏与说话人一致为止。
录下自己的声音并与原声对比，特别注意 survival, platinum, tumor 这类单词。

什么是跟读法？

跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。

影子跟读法: 阅读完整分步指南 →

跟读练习: PARP Inhibitors: 2023 Updates - 通过视频学习英语口语

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